MAIN FEATURES 8-bit resolution. ADC gain adjust. 1.5 GHz full power input bandwidth. 1 Gsps (min) sampling rate. SINAD = 44.3 dB (7.2 Effective Bits) SFDR = 58 dBc @ FS = 1 Gsps, FIN = 20 MHz : SINAD = 42.9 dB (7.0 Effective Bits) SFDR = 52 dBc @ FS = 1 Gsps, FIN = 500 MHz : SINAD = 40.3dB (6.8 Effective Bits) SFDR = 50 dBc @ FS = 1 Gsps, FIN = 1000 MHz (-3 dB FS) 2-tone IMD : -52dBc (489 MHz, 490 MHz) @ 1GSPS. DNL = 0.3 LSB INL = 0.7 LSB. -13 Low Bit Error Rate (10 ) @ 1 Gsps Very low input capacitance : 3 pF 500 mVpp differential or single-ended analog inputs. Differential or single-ended 50 ECL compatible clock inputs. ECL or LVDS/HSTL output compatibility. Data ready output with asynchronous reset. Gray or Binary selectable output data ; NRZ output mode. Power consumption : 3.4 W @ Tj = 70C typical CQFP package enhanced with heatspreader : Rthjc = 1.56C/W ADC 8-bit 1 Gsps TS8388BFS Dual power supply : 5 V Radiation tolerance oriented design (150 Krad (Si) measured). 1/ Die form : JTS8388B APPLICATIONS Digital Sampling Oscilloscopes. Satellite receiver. Electronic countermeasures / Electronic warfare. Direct RF down-conversion. SCREENING 2/ Evaluation board : TSEV8388BF 3/ Demultiplexer : TS81102G0 : companion device available Mil-PRF-38535, QML level Q for package version, DSCC 5962-0050401QYC Space screening according to ESA/SCC 9000. Temperature range: up to -55C < Tc ; Tj < +125C DESCRIPTION The TS8388BFS is a monolithic 8-bit analog-to-digital converter, designed for digitizing wide bandwidth analog signals at very high sampling rates of up to 1 Gsps. The TS8388BFS is using an innovative architecture, including an on chip Sample and Hold (S/H), and is fabricated with an advanced high speed bipolar process. The on-chip S/H has a 1.5 GHz full power input bandwidth, providing excellent dynamic performance in undersampling applications (High IF digitizing). January 2002 FS Suffix : CQFP 68 Ceramic Quad Flat Pack With heatspreader Product Specification Product Specification TABLE OF CONTENTS 1. SIMPLIFIED BLOCK DIAGRAM ....................................................................................................................................3 2. FUNCTIONAL DESCRIPTION ........................................................................................................................................3 3. SPECIFICATIONS ..............................................................................................................................................................4 3.1. 3.2. 3.3. 3.4. 3.5. 3.6. 3.7. 4. ABSOLUTE MAXIMUM RATINGS (SEE NOTES BELOW).................................................................................................................... 4 RECOMMENDED CONDITIONS OF USE ............................................................................................................................................. 4 ELECTRICAL OPERATING CHARACTERISTICS ................................................................................................................................. 5 TIMING DIAGRAMS................................................................................................................................................................................ 9 EXPLANATION OF TEST LEVELS ...................................................................................................................................................... 10 FUNCTIONS DESCRIPTION................................................................................................................................................................ 10 DIGITAL OUTPUT CODING ................................................................................................................................................................. 10 PACKAGE DESCRIPTION. ............................................................................................................................................11 4.1. 4.2. 4.3. 4.4. 5. TS8388BFS PIN DESCRIPTION .......................................................................................................................................................... 11 TS8388BFS PINOUT ............................................................................................................................................................................ 12 OUTLINE DIMENSIONS - 68 PINS CQFP .......................................................................................................................................... 13 THERMAL CHARACTERISTICS .......................................................................................................................................................... 14 TYPICAL CHARACTERIZATION RESULTS .............................................................................................................15 5.1. 5.2. 5.3. 5.4. 5.5. 5.6. 5.7. 5.8. 5.9. 5.10. STATIC LINEARITY - FS = 50 MSPS / FIN = 10 MHZ ......................................................................................................................... 15 EFFECTIVE NUMBER OF BITS VERSUS POWER SUPPLIES VARIATION ..................................................................................... 16 TYPICAL FFT RESULTS ...................................................................................................................................................................... 17 SPURIOUS FREE DYNAMIC RANGE VERSUS INPUT AMPLITUDE ................................................................................................ 18 DYNAMIC PERFORMANCE VERSUS ANALOG INPUT FREQUENCY ............................................................................................. 20 EFFECTIVE NUMBER OF BITS (ENOB) VERSUS SAMPLING FREQUENCY .................................................................................. 21 SFDR VERSUS SAMPLING FREQUENCY ......................................................................................................................................... 21 TS8388BFS ADC PERFORMANCES VERSUS JUNCTION TEMPERATURE ................................................................................... 22 TYPICAL FULL POWER INPUT BANDWIDTH .................................................................................................................................... 23 ADC STEP RESPONSE................................................................................................................................................................... 24 6. DEFINITION OF TERMS ................................................................................................................................................25 7. TS8388BFS MAIN FEATURES .......................................................................................................................................27 7.1. 7.2. 7.3. 7.4. 7.5. 7.6. 7.7. 7.8. 7.9. 7.10. 8. TIMING INFORMATIONS ..................................................................................................................................................................... 27 PRINCIPLE OF DATA READY SIGNAL CONTROL BY DRRB INPUT COMMAND............................................................................ 28 ANALOG INPUTS (VIN) (VINB) ............................................................................................................................................................ 28 CLOCK INPUTS (CLK) (CLKB) ............................................................................................................................................................ 29 NOISE IMMUNITY INFORMATIONS.................................................................................................................................................... 32 DIGITAL OUTPUTS .............................................................................................................................................................................. 32 OUT OF RANGE BIT ................................................................................................................................................................................... 34 GRAY OR BINARY OUTPUT DATA FORMAT SELECT...................................................................................................................... 35 DIODE PIN 49 ....................................................................................................................................................................................... 35 ADC GAIN CONTROL PIN 60.......................................................................................................................................................... 36 EQUIVALENT INPUT / OUTPUT SCHEMATICS ......................................................................................................37 8.1. EQUIVALENT ANALOG INPUT CIRCUIT AND ESD PROTECTIONS ................................................................................................ 37 8.2. EQUIVALENT ANALOG CLOCK INPUT CIRCUIT AND ESD PROTECTIONS................................................................................... 37 8.3. EQUIVALENT DATA OUTPUT BUFFER CIRCUIT AND ESD PROTECTIONS .................................................................................. 38 ADC GAIN ADJUST EQUIVALENT INPUT CIRCUITS AND ESD PROTECTIONS.......................................................................................... 38 8.5. GORB EQUIVALENT INPUT SCHEMATIC AND ESD PROTECTIONS.............................................................................................. 39 8.6. DRRB EQUIVALENT INPUT SCHEMATIC AND ESD PROTECTIONS .............................................................................................. 39 9. TSEV8388BFS : DEVICE EVALUATION BOARD ......................................................................................................40 10. 10.1. 10.2. 2 ORDERING INFORMATION .....................................................................................................................................41 PACKAGE DEVICE .......................................................................................................................................................................... 41 EVALUATION BOARD ..................................................................................................................................................................... 41 TS8388BFS TS8388BFS 1. SIMPLIFIED BLOCK DIAGRAM GAIN MASTER/SLAVE TRACK & HOLD VIN,VINB G=2 T/H G=1 T/H G=1 RESISTOR CHAIN ANALOG ENCODING BLOCK 4 INTERPOLATION STAGES 4 5 REGENERATION LATCHES 4 ERROR CORRECTION & DECODE LOGIC CLOCK BUFFER CLK, CLKB 5 8 OUTPUT LATCHES & BUFFERS 8 DRRB DR,DRB 2. GORB DATA,DATAB OR,ORB FUNCTIONAL DESCRIPTION The TS8388BFS is an 8 bit 1GSPS ADC based on an advanced high speed bipolar technology featuring a cutoff frequency of 25 GHz. The TS8388BFS includes a front-end master/slave Track and Hold stage (S/H), followed by an analog encoding stage and interpolation circuitry. Successive banks of latches are regenerating the analog residues into logical data before entering an error correction circuitry and a resynchronization stage followed by 75 differential output buffers. The TS8388BFS works in fully differential mode from analog inputs up to digital outputs. The TS8388BFS features a full power input bandwidth of 1.5 GHz. Control pin GORB is provided to select either Gray or Binary data output format. Gain control pin is provided in order to adjust the ADC gain. A Data Ready output asynchronous reset (DRRB) is available on TS8388BFS. The TS8388BFS uses only vertical isolated NPN transistors together with oxide isolated polysilicon resistors, which allow enhanced radiation tolerance (no performance drift measured at 150kRad total dose). Product Specification 3 Product Specification 3. SPECIFICATIONS 3.1. ABSOLUTE MAXIMUM RATINGS (SEE NOTES BELOW) Parameter Symbol Value Unit Positive supply voltage VCC GND to 6 V Digital negative supply voltage DVEE GND to -5.7 V Digital positive supply voltage VPLUSD GND-0.3 to 2.8 V Negative supply voltage VEE GND to -6 V Maximum difference between negative supply voltages DVEE to VEE 0.3 V Analog input voltages VIN or VINB -1 to +1 V Maximum difference between VIN and VINB VIN - VINB -2 to +2 V Digital input voltage VD GORB -0.3 to VCC +0.3 V Digital input voltage VD DRRB VEE -0.3 to +0.9 V Digital output voltage Clock input voltage Maximum difference between VCLK and VCLKB Vo VPLUSD-3 to VPLUSD -0.5 V VCLK or VCLKB -3 to +1.5 V VCLK - VCLKB -2 to +2 V Tj +135 o Tstg -65 to +150 o +300 o Maximum junction temperature Storage temperature Lead temperature (soldering 10s) Notes : Comments Tleads C C C Absolute maximum ratings are limiting values (referenced to GND=0V), to be applied individually, while other parameters are within specified operating conditions. Long exposure to maximum rating may affect device reliability. The use of a thermal heat sink is mandatory (see Thermal characteristics). 3.2. RECOMMENDED CONDITIONS OF USE Parameter Positive supply voltage Positive digital supply voltage VPLUSD ECL output compatibility VPLUSD LVDS output compatibility VEE, DVEE Differential analog input voltage (Full Scale) VIN, VINB Operating temperature range Comments VCC Negative supply voltages Clock input power level 4 Symbol 50 differential or single-ended VIN -VINB PCLK PCLKB TJ TS8388BFS 50 single-ended clock input Commercial grade: "C" Industrial grade: "V" Military grade: "M" Min. Typ. Max. Unit 4.75 +5 5.25 V GND V +1.4 +2.4 +2.6 V -5.25 -5.0 -4.75 V 113 125 137 mV 450 500 550 mVpp 3 4 10 dBm 0 < Tc ; Tj < 90 -40 < Tc ; Tj < 110 -55 < Tc ; Tj < +125 o C TS8388BFS 3.3. ELECTRICAL OPERATING CHARACTERISTICS VEE = DVEE = -5 V ; VCC = +5 V ; VIN -VINB = 500 mVpp Full Scale differential input ; Digital outputs 75 or 50 differentially terminated ; Tj (typical) = 70C. Full Temperature Range: up to -55C<Tc; Tj<+125C. Parameter Symb Test level Min Typ Max Unit 4.7 5 5.3 V POWER REQUIREMENTS Positive supply voltage Positive supply current Analog VCC 1, 2, 6 Digital (ECL) VPLUSD 4 Digital (LVDS) VPLUSD 4 2.4 2.6 V ICC 1, 2 385 445 mA 6 395 445 mA Digital IPLUSD 1, 2 115 145 mA 6 120 145 mA Analog Digital Nominal power dissipation VEE 1, 2, 6 -5 -4.7 V AIEE 1, 2 165 200 mA 6 170 200 mA DIEE 1, 2 135 180 mA 6 145 180 mA 1, 2 3.4 4.1 W 6 3.6 4.3 W 4 0.5 2 mV/V PD Power supply rejection ratio (note 2) 1.4 V Analog Negative supply voltage Negative supply current 0 PSRR -5.3 8 RESOLUTION bits ANALOG INPUTS Full Scale Input Voltage range (differential mode) ( 0 Volt common mode voltage ) VIN 4 VINB 4 125 mV -125 125 mV 250 mV Full Scale Input Voltage range (single-ended input option ) (see Application Notes) VINB Analog input capacitance CIN 4 3 3.5 pF Input bias current IIN 4 10 20 A Input Resistance VIN -125 -250 0 mV RIN 4 0.5 1 M Full Power input Bandwidth FPBW 4 1.3 1.5 GHz Small Signal input Bandwidth (10 % full scale) SSBW 4 1.5 1.7 GHz CLOCK INPUTS Logic compatibility for clock inputs (see Application Notes) (note 10 ) ECL or specified clock input power level in dBm ECL Clock inputs voltages (VCLK or VCLKB) : 4 * Logic "0" voltage VIL * Logic "1" voltage VIH * Logic "0" current IIL 5 50 A * Logic "1" current IIH 5 50 A 4 10 dBm 3 3.5 pF -1.5 -1.1 Clock input power level into 50 termination V DBm into 50 Clock input power level Clock input capacitance V 4 CCLK 4 -2 Product Specification 5 Product Specification Parameter Symb Test level Min Typ Max Unit DIGITAL OUTPUTS (notes 1,6) Single ended or differential input mode, 50 % clock duty cycle (CLK,CLKB), Binary output data format, Tj (typical) = 70C. Logic compatibility for digital outputs ( Depending on the value of VPLUSD ) (see Application Notes) ECL or LVDS Differential output voltage swings ( assuming VPLUSD = 0V) : 4 75 open transmission lines ( ECL levels ) 1.50 1.620 V 75 differentially terminated 0.70 0.825 V 50 differentially terminated 0.54 0.660 V Output levels ( assuming VPLUSD = 0V) 75 open transmission lines 4 (note 6) * Logic "0" voltage VOL * Logic "1" voltage VOH Output levels ( assuming VPLUSD = 0V) 75 differentially terminated -1.54 -0.8 V V 4 (note 6) * Logic "0" voltage VOL * Logic "1" voltage VOH Output levels ( assuming VPLUSD = 0V) 50 differentially terminated -1.62 -0.88 -1.41 -1.07 -1.34 -1 V V (note 6) * Logic "0" voltage VOL 1, 2 * Logic "1" voltage VOH 1, 2 -1.16 -1.10 6 -1.25 -1.10 V 4 270 300 mV 6 Differential Output Swing DOS Output level drift with temperature -1.40 -1.32 V -1.40 -1.25 V 4 V 1.6 mV/C DC ACCURACY Single ended or differential input mode, 50 % clock duty cycle (CLK,CLKB), Binary output data format, Tj (typical) = 70C. Differential non linearity (notes 2,3) DNLDNL+ Integral non linearity (notes 2,3) INLINL+ No missing codes (note 3) Gain error -0.5 -0.25 LSB 6 -0.6 -0.35 LSB 1, 2 0.3 0.6 LSB 6 0.4 0.7 LSB 1, 2 -1.0 0.7 LSB 6 -1.2 0.9 LSB 1, 2 0.7 1.0 LSB 6 0.9 1.2 LSB Guaranteed over specified temperature range 1, 2 -10 -2 10 % FS 6 -11 -2 11 % FS 1, 2 -26 -5 26 mV 6 -30 -5 30 mV Gain error drift 4 100 125 150 ppm/C Offset error drift 4 40 50 60 ppm/C Input offset voltage 6 1, 2 TS8388BFS TS8388BFS Parameter Symb Test level Min Typ Max Unit TRANSIENT PERFORMANCE Bit Error Rate FS = 1 Gsps (notes 2, 4) BER 4 1E-12 Fin = 62.5 MHz Error/ sample ADC settling time VIn -VinB = 400 mVpp (note 2) TS 4 0.5 1 ns Overvoltage recovery time (note 2) TOR 4 0.5 1 ns AC PERFORMANCE Single ended or differential input and clock mode, 50 % clock duty cycle (CLK,CLKB), Binary output data format, Tj. = 70C, unless otherwise specified. Signal to Noise and Distortion ratio (note 2) SINAD FS = 1 Gsps Fin = 20 MHz 4 42 44 dB FS = 1 Gsps Fin = 500 MHz 4 41 43 dB FS = 1 Gsps Fin = 1000 MHz (-1dB Fs) 4 38 40 dB 1, 2, 6 40 44 dB FS = 50 Msps Fin = 25 MHz Effective Number Of bits ENOB FS = 1 Gsps Fin = 20 MHz 4 7.0 7.2 Bits FS = 1 Gsps Fin = 500 MHz 4 6.6 6.8 Bits FS = 1 Gsps Fin = 1000 MHz (-1dBFs) 4 6.2 6.4 Bits 1, 2, 6 7.0 7.2 Bits FS = 50 Msps Fin = 25 MHz Signal to Noise Ratio (note 2) SNR FS = 1 Gsps Fin = 20 MHz 4 42 45 dB FS = 1 Gsps Fin = 500 MHz 4 41 44 dB FS = 1 Gsps Fin = 1000 MHz (-1dBFs) 4 41 44 dB 1, 2, 6 44 45 dB FS = 50 Msps Fin = 25 MHz Total Harmonic Distortion (note 2) THD FS = 1 Gsps Fin = 20 MHz 4 50 54 dB FS = 1 Gsps Fin = 500 MHz 4 46 50 dB FS = 1 Gsps Fin = 1000 MHz (-1dBFs) 4 42 46 dB 1, 2, 6 46 51 dB FS = 50 Msps Fin = 25 MHz Spurious Free Dynamic Range (note 2) SFDR FS = 1 Gsps Fin = 20 MHz 4 52 57 dBc FS = 1 Gsps Fin = 500 MHz 4 47 52 dBc FS = 1 Gsps Fin = 1000 MHz (-1dBFs) 4 42 47 dBc FS = 1 Gsps Fin = 1000 MHz (-3dBFs) 4 45 50 dBc 1, 2, 6 40 54 dBc - 47 - 52 dBc FS = 50 Msps Fin = 25 MHz Two-tone inter-modulation distortion FIN1 = 489 MHz @ FS = 1 Gsps (note 2) IMD 4 FIN2 = 490 MHz @ FS = 1 Gsps Product Specification 7 Product Specification Parameter Symb Test level Min Typ Max Unit SWITCHING PERFORMANCE AND CHARACTERISTICS - See Timing Diagrams Figure 1, Figure 2 Maximum clock frequency (Note 14) FS 1 1.4 Gsps Minimum clock frequency (Note 15) FS 4 10 50 Msps TC1 4 0.280 0.500 TC2 4 0.350 TA 4 100 Jitter 4 Minimum Clock pulse width (high) Minimum Clock pulse width (low) Aperture delay (Note 2) Aperture uncertainty (Notes 2, 5) Data output delay (Notes 2, 10, 11, 12) 50 ns 0.500 50 ns +250 400 ps 0.4 0.6 ps (rms) TOD 4 1150 1360 1660 ps Output rise/fall time for DATA (20 % - 80 %) (note 11) TR/TF 4 250 350 550 ps Output rise/fall time for DATA READY TR/TF 4 250 350 550 ps TDR 4 1110 1320 1620 ps Data ready reset delay TRDR 4 720 1000 ps Data to data ready - clock low pulse width TODTDR 4 0 40 80 ps TD1 4 420 460 500 ps TPD 4 (20 % - 80 % ) (note 11) Data ready output delay (Notes 2,10, 11, 12) (See timing diagram, notes 9, 13,14) Data to data ready output delay (50% duty cycle) (See timing diagram, notes 2, 15) @ 1Gsps Data pipeline delay Note 1 : Note 2 : Note 3 : Note 4 : Note 5 : 4 clock cycles Differential output buffers are internally loaded by 75 resistors. Buffer bias current = 11 mA. See definition of terms Histogram testing based on sampling of a 10 MHz sinewave at 50 MSPS. Output error amplitude < 4 LSB around worst code. Maximum jitter value obtained for single-ended clock input on the JTS8388B die (chip on board) : 200 fs. (500 fs expected on TS8388BG) Note 6 : Digital output back termination options depicted in Application Notes figures 3,4,5 . Note 7 : With a typical value of TD = 465 ps, at 1 Gsps, the timing safety margin for the data storing using the ECLinPS 10E452 output registers from Motorola is of 315 ps, equally shared before and after the rising edge of the Data Ready signals (DR, DRB). Note 8 : The clock inputs may be indifferently entered in differential or single-ended, using ECL levels or 4 dBm typical power level into the 50 termination resistor of the inphase clock input. (4 dBm into 50 clock input correspond to 10 dBm power level for the clock generator.) Note 9 : At 1GSPS, 50/50 clock duty cycle, TC2 = 500 ps (TC1). TDR - TOD = -100 ps (typ) does not depend on the sampling rate. Note 10 : Specified loading conditions for digital outputs : - 50 or 75 controlled impedance traces properly 50 / 75 terminated, or unterminated 75 controlled impedance traces. - Controlled impedance traces far end loaded by 1 standard ECLinPS register from Motorola.( e.g. : 10E452 ) ( Typical input parasitic capacitance of 1.5 pF including package and ESD protections. ) Note 11 : Termination load parasitic capacitance derating values : - 50 or 75 controlled impedance traces properly 50 / 75 terminated : 60 ps / pF or 75 ps per additionnal ECLinPS load. - Unterminated ( source terminated ) 75 controlled impedance lines : 100 ps / pF or 150 ps per additionnal ECLinPS termination load. Note 12 : apply proper 50 / 75 impedance traces propagation time derating values : 6 ps / mm (155 ps/inch) for TSEV8388BFS Evaluation Board. o Note 13 : Values for TOD and TDR track each other over temperature, ( 1 % variation for TOD - TDR per 100 C. temperature variation ). Therefore TOD - TDR variation over temperature is negligible. Moreover, the internal ( onchip ) and package skews between each Data TODs and TDR effect can be considered as negligible.Consequently, minimum values for TOD and TDR are never more than 100 ps apart. The same is true for the TOD and TDR maximum values (see Advanced Application Notes about TOD - TDR variation over temperature in section 7). Note 14 : Min value guaranties performance. Max value guaranties functionality. Note 15 : Min value guaranties functionality. Max value guaranties performance. 8 TS8388BFS TS8388BFS 3.4. TIMING DIAGRAMS TA= 250 ps (VIN, VINB ) X X N N-1 N+1 X N+5 X N+4 X N+3 X N+2 1. TC=1000 ps TC1 TC2 (CLK, CLKB) DIGITAL OUTPUTS TOD = 1360 ps TPD: 4.0 Clock periods 1360 ps DATA N-5 1000 ps DATA N-4 DATA N-3 DATA N-2 DATA DATA N N-1 TD1=TC1+TDR-TOD = TC1-40 ps = 460 ps ps TDR = 1320 ps TDR = 1320 ps Data Ready (DR, DRB) TD2 = TC2+TOD-TDR = TC2+40ps = 540 ps TRDR = 720 ps DRRB DATA N+1 1ns (min) Figure 1 : TS8388BFS TIMING DIAGRAM ( 1 GSPS CLOCK RATE ) Data Ready Reset , Clock held at LOW level TA= 250ps (VIN, VINB ) X N X N-1 2. N+1 X N+2 X N+5 X N+4 3. N+3 TC = 1000 ps TC1 TC2 (CLK, CLKB) DIGITAL OUTPUTS TOD = 1360 ps TPD: 4.0 Clock periods 1360 ps DATA N-5 1000 ps DATA N-4 DATA N-3 DATA N-2 DATA N DATA N+1 TD1=TC1+TDR-TOD = TC1-40 ps = 460 ps TDR = 1120 ps TDR = 1320 ps DATA N-1 Data Ready (DR, DRB) TD2 = TC2+TOD-TDR = TC2+40ps = 540 ps TRDR = 720ps DRRB 1ns (min) Figure 2 : TS8388BFS TIMING DIAGRAM ( 1 GSPS CLOCK RATE ) Data Ready Reset , Clock held at HIGH level Product Specification 9 Product Specification 3.5. EXPLANATION OF TEST LEVELS 1 100% production tested at +25C (1) (1) (for "C" Temperature range (2) ). , and sample tested at specified temperatures (for "V" and "M" Temperature ranges 100 % production tested at +25C 3 Sample tested only at specified temperatures 4 Parameter is guaranteed by design and characterization testing (thermal steady-state conditions at specified temperature). 5 Parameter is a typical value only 6 100 % production tested over specified temperature range (for "B/Q" Temperature range (2) ). Only MIN and MAX values are guaranteed (typical values are issuing from characterization results). (1) Unless otherwise specified, all tests are pulsed tests : therefore Tj = Tc = Ta, where Tj ,Tc and Ta are junction, case and ambient temperature respectively. (2) Refer to ORDERING INFORMATION chapter. 3.6. FUNCTIONS DESCRIPTION Name Function VCC Positive power supply VEE Analog negative power supply VPLUSD Digital positive power supply GND Ground VIN, VINB Differential analog inputs CLK, CLKB Differential clock inputs VCC = +5 V <D0:D7> <D0B:D7B> Differential output data port DR ; DRB Differential data ready outputs OR ; ORB Out of range outputs GAIN ADC gain adjust GORB Gray or Binary digital output select DIOD/DRRB Die junction temp. measurement/ asynchronous data ready reset VPLUSD = +0 V (ECL) VPLUSD=+2.4V (LVDS) VIN OR VINB ORB CLK 16 TS8388BFS CLKB D0 D7 D0B D7B GAIN DR GORB DRB DIOD/ DRRB DVEE=-5V VEE=-5V GND 3.7. DIGITAL OUTPUT CODING NRZ (Non Return to Zero) mode, ideal coding : does not include gain, offset, and linearity voltage errors. Differential Voltage level Out of Range Digital output analog input Binary GORB = VCC or floating 10 (2) 2 Gray GORB = GND > +251 mV > Positive full scale + 1/2 LSB 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 1 +251 mV +249 mV Positive full scale + 1/2 LSB Positive full scale - 1/2 LSB 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 +126 mV +124 mV Positive 1/2 scale + 1/2 LSB Positive1/2 scale - 1/2 LSB 1 1 0 0 0 0 0 0 1 0 1 1 1 1 1 1 1 0 1 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 +1 mV -1 mV Bipolar zero + 1/2 LSB Bipolar zero - 1/2 LSB 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 -124 mV -126 mV Negative 1/2 scale + 1/2 LSB Negative 1/2 scale - 1/2 LSB 0 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 1 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 -249 mV -251 mV Negative full scale + 1/2 LSB Negative full scale - 1/2 LSB 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 < -251 mV < Negative full scale - 1/2 LSB 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 TS8388BFS ). TS8388BFS 4. PACKAGE DESCRIPTION. 4.1. TS8388BFS PIN DESCRIPTION Symbol Pin number Function GND 5, 13, 27, 28, 34, 35, 36, 41, 42, 43, 50, 51, 52, 53, 58, 59 Ground pins. To be connected to external ground plane. VPLUSD 1, 2, 16, 17, 18, 68 Digital positive supply. (0V for ECL compatibility, +2.4V for LVDS compatibility). (note 2) VCC 26, 29, 32, 33, 46, 47, 61 +5 V positive supply. VEE 30, 31, 44, 45, 48 -5 V analog negative supply. DVEE 8, 9, 10 -5 V digital negative supply. VIN 54 , 55 VINB 56, 57 CLK (1) 37 , 38 CLKB 39, 40 D0, D1, D2, D3, D4, D5, D6, D7 23, 21, 19, 14, 6, 3, 66, 64 In phase (+) digital outputs. B0 is the LSB. B7 is the MSB. D0B, D1B, D2B, D3B, D4B, D5B, D6B, D7B 24, 22, 20, 15, 7, 4, 67, 65 Inverted phase (-) Digital outputs. B0B is the inverted LSB. B7B is the inverted MSB. OR 62 In phase (+) Out of Range Bit. Out of Range is high on the leading edge of code 0 and code 256. ORB 63 Inverted phase (+) of Out of Range Bit (OR). DR 11 In phase (+) output of Data Ready Signal. DRB 12 Inverted phase (-) output of Data Ready Signal (DR). GORB 25 Gray or Binary select output format control pin. - Binary output format if GORB is floating or VCC. - Gray output format if GORB is connected at ground (0 V). GAIN 60 ADC gain adjust pin. DIOD/DRRB 49 This pin has a double function (can be left open or grounded if not used) : DIOD : die junction temperature monitoring pin. DRRB : asynchronous data ready reset function Note 1 : Note 2 : (1) (1) (1) In phase (+) analog input signal of the Sample and Hold differential preamplifier. Inverted phase (-) of analog input signal (VIN). In phase (+) ECL clock input signal. The analog input is sampled and held on the rising edge of the CLK signal. Inverted phase (-) of ECL clock input signal (CLK). Following pin numbers 37 (CLK), 40 (CLKB), 54 (VIN) and 57 (VINB) have to be connected to GND through a 50 resistor as close as possible to the package.(50 termination preferred option). The common mode level of the output buffers is 1.2V below the positive digital supply. For ECL compatibility the positive digital supply must be set at 0V (ground ). For LVDS compatibility (output common mode at +1.2V) the positive digital supply must be set at 2.4V. If the subsequent LVDS circuitry can withstand a lower level for input common mode, it is recommended to lower the positive digital supply level in the same proportion in order to spare power dissipation. Product Specification 11 Product Specification 4.2. TS8388BFS PINOUT VPLUSD VPLUSD D5 D5B VPLUSD VPLUSD D2 D6B D2B D6 D1 D7B D1B D7 D0 ORB D0B OR TS8388BFS 12 D4 D4B DR DRB D3 D3B VPLUSD VPLUSD TOP VIEW : TS8388BFS TS8388BFS 4.3. OUTLINE DIMENSIONS - 68 PINS CQFP 68 pins Ceramic Quad Flat Pack 0.8 BCS 20.32 BSC .023 .002 0.58 0.05 0.050 BCS 1.27 BSC . o O Pin N 1 index M Z 1.133 - 1.147 28.78 - 29.13 .950 .006 24.13 0.152 .005 CQFP 68 X Y .950 .006 24.13 0.152 1.133 - 1.147 28,78 - 29.13 .0385 0.978 .007 .005 0.18 0.13 .0310 0.787 .020 .005 0.51 0.13 .027 - .037 0.70 - 0.95 0o - 8o .005 - .010 0.13 - 0.25 Product Specification 13 Product Specification 4.4. THERMAL CHARACTERISTICS 4.4.1. ENHANCED CQFP The CQFP68 has been modified, in order to improve the thermal characteristics : A CuW heatspreader has been added at the bottom of the package. The die has been electrically isolated with the ALN substrate. 4.4.2. THERMAL RESISTANCE FROM JUNCTION TO AMBIENT : RTHJA The following table lists the convector thermal performances parameters of the device itself, with no external heatsink added. 4.4.3. THERMAL RESISTANCE FROM JUNCTION TO CASE : RTHJC o Typical value for Rthjc is given to 1.56 C/W. This value does not include thermal contact resistance between package and external component (heatsink or PCBoard). o As an example, 2.0 C/W can be taken for 50 m of thermal grease. 4.4.4. HEATSINK It is recommended to use an external heatsink, or PCBoard special design. The stand off has been calculated to permit the simultaneous soldering of the leads and of the heatspreader with the solder paste. Suggested assembly : 28.78 24.13 Printed circuit board CuW heatspreader Thermal via Cooling system efficiency can be monitored using the Temperature Sensing Diode, integrated in the device. 14 TS8388BFS Solid ground plane TS8388BFS 5. TYPICAL CHARACTERIZATION RESULTS 5.1. STATIC LINEARITY - FS = 50 MSPS / FIN = 10 MHZ 5.1.1. INTEGRAL NON LINEARITY LSB INL = +/- 0.7 LSB code Clock Frequency = 50Msps Signal Frequency = 10MHz Positive peak : 0.78 LSB 5.1.2. Negative peak : -0.73 LSB DIFFERENTIAL NON LINEARITY LSB DNL = +/- 0.4 LSB code Clock Frequency = 50Msps Positive peak : 0.3 LSB Signal Frequency = 10MHz Negative peak : -0.39 LSB Product Specification 15 Product Specification 5.2. EFFECTIVE NUMBER OF BITS VERSUS POWER SUPPLIES VARIATION Effective number of bits = f (VEEA) ; Fs = 500 MSPS ; Fin = 100 MHz 8 7 ENOB (bits) 6 5 4 3 2 1 0 -7 -6,5 -6 -5,5 -5 -4,5 -4 VEEA (V) Effective number of bits = f (VCC) ; Fs = 500 MSPS ; Fin = 100 MHz 8 7 ENOB (bits) 6 5 4 3 2 1 0 3 3,5 4 4,5 5 5,5 6 6,5 7 VCC (V) Effective number of bits = f (VEED) ; Fs = 500 MSPS ; Fin = 100 MHz 8 7 ENOB (bits) 6 5 4 3 2 1 0 -6 -5,5 -5 -4,5 VEED (V) 16 TS8388BFS -4 -3,5 -3 TS8388BFS 5.3. TYPICAL FFT RESULTS 5.3.1 FS = 1 GSPS, FIN=20 MHZ Single Ended or differential H11 H2 H3 Fs =1 GSPS Fin = 20 MHz H12 Eff. Bits =7.2 SINAD = 44.3 dB SNR = 44.7dB THD = -54dBc SFDR = -57 dBc Binary output coding clock duty cycle = 50 % 5.3.2. FS = 1 GSPS, FIN = 495 MHZ H12 H14 H2 H3 H11 Single Ended or differential Fs =1 GSPS Fin=495MHz Eff. Bits =6.8 SINAD =43 dB SNR = 44.1 dB THD = -50 dBc SFDR= -52 dBc Binary output coding clock duty cycle = 50 % 5.3.3. FS = 1 GSPS, FIN = 995 MHZ ( -3DB FULL SCALE INPUT) Single Ended or differential H3 H2 H10 Fs =1 GSPS Fin=995 MHz Eff. Bits =6.6 SINAD =40.8 dB SNR = 44 dB THD = -48 dBc SFDR= -50 dBc Binary output coding clock duty cycle = 50 % Product Specification 17 Product Specification 5.4. SPURIOUS FREE DYNAMIC RANGE VERSUS INPUT AMPLITUDE 5.4.1. SAMPLING FREQUENCY FS=1 GSPS ; INPUT FREQUENCY FIN=995 MHZ ; GRAY OR BINARY OUTPUT CODING Full Scale SFDR = -47 dBc H3 magnitude (code) H2 Fs = 1 GSPS ENOB = 6 4 18 SINAD = 40 dB TS8388BFS Fin = 995 MHz SNR = 44dB Full Scale THD = -46 dBc SFDR = -47 dBc TS8388BFS -3dB Full Scale SFDR = -50 dBc magnitude (code) H3 H2 Fs = 1 GSPS ENOB = 6.6 SINAD = 40.8 dB Fin = 995 MHz SNR = 44dB (-3 dB Full Scale) THD = -48dBc SFDR = -50dBc Product Specification 19 Product Specification 5.5. DYNAMIC PERFORMANCE VERSUS ANALOG INPUT FREQUENCY Fs=1 Gsps, Fin = 0 up to 1600 MHz, Full Scale input (FS), FS -3 dB Clock duty cycle 50 / 50, Binary/Gray output coding, fully differential or single-ended analog and clock inputs 8 ENOB (dB) 7 6 -3 dB FS 5 FS 4 3 0 200 400 600 800 1000 1200 1400 1600 1800 Input frequency (MHz) 50 48 46 44 FS SNR (dB) 42 40 -3 dB FS 38 36 34 32 30 0 200 400 600 800 1000 1200 1400 1600 1800 Input frequency (MHz) -20 -25 FS SFDR (dBc) -30 -35 -3 dB FS -40 -45 -50 -55 -60 0 200 400 600 800 1000 Input frequency (MHz) 20 TS8388BFS 1200 1400 1600 1800 TS8388BFS 5.6. EFFECTIVE NUMBER OF BITS (ENOB) VERSUS SAMPLING FREQUENCY Analog Input Frequency : Fin = 495 MHz and Nyquist conditions ( Fin = Fs / 2 ) Clock duty cycle 50 / 50 , Binary output coding 8 Fin= FS/2 7 Fin=500 M H z ENOB (dB) 6 5 4 3 2 0 200 400 600 800 1000 1200 1400 1600 Sampling frequency (Msps) 5.7. SFDR VERSUS SAMPLING FREQUENCY Analog Input Frequency : Fin = 495 MHz and Nyquist conditions ( Fin = Fs / 2 ) Clock duty cycle 50 / 50 , Binary output coding -20 -25 -30 SFDR (dBc) -35 -40 -45 Fin= FS/2 -50 Fin=500 MHz -55 -60 0 200 400 600 800 1000 1200 1400 1600 Sampling frequency (Msps) Product Specification 21 Product Specification 5.8. TS8388BFS ADC PERFORMANCES VERSUS JUNCTION TEMPERATURE Effective number of bits versus junction temperature Fs = 1 GSPS ; Fin = 500 MHz ; Duty cycle = 50% 8 ENOB (bits) 7 6 5 4 3 -40 -20 0 20 40 60 80 100 120 140 160 o Temperature ( C) Signal to noise ratio versus junction temperature Fs = 1 GSPS ; Fin = 507 MHz ; Differential clock, Single-ended analog input (Vin=-1dBFs) 46 SNR (dB) 45 44 43 42 -60 -40 -20 0 20 40 60 80 100 120 o Temperature ( C) Total harmonic distorsion versus junction temperature Fs = 1 GSPS ; Fin = 507 MHz ; Differential clock, Single-ended analog input (Vin=-1dBFs) 53 THD (dB) 51 49 47 45 43 -60 -40 -20 0 20 40 60 o Temperature ( C) 22 TS8388BFS 80 100 120 TS8388BFS Power consumption versus junction temperature Fs = 1 G S P S ;Fin = 500 M H z ;D uty cycle = 50% Power consumption (W 5 4 3 2 1 0 -40 -20 0 20 40 60 80 100 120 140 160 o Tem perature ( C ) 5.9. TYPICAL FULL POWER INPUT BANDWIDTH 1.5 GHz at -3 dB (-2dBm full power input) Frequency (MHz) 100 0 300 500 700 900 1100 1300 1500 1700 Magnitude (dB) -1 -2 -3 -4 -5 -6 Product Specification 23 Product Specification 5.10. ADC STEP RESPONSE Test pulse input characteristics : 20% to 80% input full scale and rise time ~ 200ps. Note : This step response was obtained with the TSEV8388B chip on board (device in die form). 5.10.1. TEST PULSE DIGITIZED WITH 20 GHZ DSO Vpp ~ 260 mV Tr ~ 240 ps 50 mV/div 50 mV/div 500 ps/div 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 time (ns) 5.10.2. SAME TEST PULSE DIGITIZED WITH TS8388BFS ADC 200 ADC code 150 Tr ~ 280 ps 50 codes/div (Vpp ~260 mV) 500 ps/div 100 ADC calculated rise time : between 150 and 200 ps. 50 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 time (ns) N.B. : ripples are due to the test setup (they are present on both measurements) 24 TS8388BFS 4.5 5.0 TS8388BFS 6. DEFINITION OF TERMS (BER) Bit Error Rate Probability to exceed a specified error threshold for a sample. An error code is a code that differs by more than +/- 4 LSB from the correct code. (BW) Full power input Analog input frequency at which the fundamental component in the digitally reconstructed output has fallen by 3 Db with respect to its low frequency value (determined by FFT analysis) for input at Full Scale. bandwidth (SINAD) Signal to noise and distortion ratio Ratio expressed in Db of the RMS signal amplitude, set to 1Db below Full Scale, to the RMS sum of all other spectral components, including the harmonics except DC. (SNR) Signal to noise ratio Ratio expressed in Db of the RMS signal amplitude, set to 1Db below Full Scale, to the RMS sum of all other spectral components excluding the five first harmonics. (THD) Total harmonic Ratio expressed in dBc of the RMS sum of the first five harmonic components, to the RMS value of the measured fundamental spectral component. distorsion (SFDR) Spurious free dynamic range (ENOB) Effective Number Of Bits (DNL) Differential non linearity Ratio expressed in Db of the RMS signal amplitude, set at 1Db below Full Scale, to the RMS value of the next highest spectral component (peak spurious spectral component). SFDR is the key parameter for selecting a converter to be used in a frequency domain application ( Radar systems, digital receiver, network analyzer ....). It may be reported in dBc (i.e., degrades as signal levels is lowered), or in Dbfs (i.e. always related back to converter full scale). SINAD - 1.76 + 20 log (A/V/2) Where A is the actual input amplitude and V ENOB = is the full scale range of the ADC under test 6.02 The Differential Non Linearity for an output code i is the difference between the measured step size of code i and the ideal LSB step size. DNL (i) is expressed in LSBs. DNL is the maximum value of all DNL (i). DNL error specification of less than 1 LSB guarantees that there are no missing output codes and that the transfer function is monotonic. (INL) Integral non linearity The Integral Non Linearity for an output code i is the difference between the measured input voltage at which the transition occurs and the ideal value of this transition. INL (i) is expressed in LSBs, and is the maximum value of all |INL (i)|. (DG) Differential gain The peak gain variation (in percent) at five different DC levels for an AC signal of 20% Full Scale peak to peak amplitude. FIN = 5 MHz. (TBC) (DP) Differential phase Peak Phase variation (in degrees) at five different DC levels for an AC signal of 20% Full Scale peak to peak amplitude. FIN = 5 MHz. (TBC) (TA) Aperture delay Delay between the rising edge of the differential clock inputs (CLK,CLKB) (zero crossing point), and the time at which (VIN,VINB) is sampled. (JITTER) Aperture uncertainty Sample to sample variation in aperture delay. The voltage error due to jitter depends on the slew rate of the signal at the sampling point. (TS) Settling time Time delay to achieve 0.2 % accuracy at the converter output when a 80% Full Scale step function is applied to the differential analog input. (ORT) Overvoltage recovery Time to recover 0.2 % accuracy at the output, after a 150 % full scale step applied on the input is reduced to midscale. time (TOD) (TD1) Output delay Delay from the falling edge of the differential clock inputs (CLK,CLKB) (zero crossing point) to the next point of change in the differential output data (zero crossing) with specified load. Time delay from Data to Time delay from Data transition to Data ready. Digital data Data Ready (TD2) Time delay from Data Ready to Data General expression is TD1 = TC1 + TDR - TOD with TC = TC1 + TC2 = 1 encoding clock period. (TC) Encoding clock period TC1 = Minimum clock pulse width (high) TC = TC1 + TC2 TC2 = Minimum clock pulse width (low) (TPD) Pipeline Delay Number of clock cycles between the sampling edge of an input data and the associated output data being made available, (not taking in account the TOD). For the TS8388BFS the TPD is 4 clock periods. (TRDR) Data Ready reset delay Delay between the falling edge of the Data Ready output asynchronous Reset signal (DDRB) and the reset to digital zero transition of the Data Ready output signal (DR). (TR) Rise time Time delay for the output DATA signals to rize from 20% to 80% of delta between low level and Product Specification 25 Product Specification high level. (TF) Fall time Time delay for the output DATA signals to fall from 80% to 20% of delta between low level and high level. (PSRR) Power supply Ratio of input offset variation to a change in power supply voltage. rejection ratio (NRZ) Non return to zero When the input signal is larger than the upper bound of the ADC input range, the output code is identical to the maximum code and the Out of Range bit is set to logic one. When the input signal is smaller than the lower bound of the ADC input range, the output code is identical to the minimum code, and the Out of range bit is set to logic one. (It is assumed that the input signal amplitude remains within the absolute maximum ratings). (IMD) InterModulation Distortion The two tones intermodulation distortion ( IMD ) rejection is the ratio of either input tone to the worst third order intermodulation products. The input tones levels are at - 7Db Full Scale. (NPR) Noise Power Ratio The NPR is measured to characterize the ADC performance in response to broad bandwidth signals. When using a notch-filtered broadband white-noise generator as the input to the ADC under test, the Noise Power Ratio is defined as the ratio of the average out-of-notch to the average in-notch power spectral density magnitudes for the FFT spectrum of the ADC output sample test. 26 TS8388BFS TS8388BFS 7. TS8388BFS MAIN FEATURES 7.1. TIMING INFORMATIONS 7.1.1. TIMING VALUE FOR TS8388BFS Timing values as defined in 3.3 are advanced data, issuing from electric simulations and first characterizations results fitted with measurements. Timing values are given at CQFP68 package inputs/outputs, taking into account package internal controlled impedance traces propagation delays, gullwing pin model, and specified termination loads. Propagation delays in 50/75 ohms impedance traces are NOT taken into account for TOD and TDR. Apply proper derating values corresponding to termination topology. The min/max timing values are valid over the full temperature range in the following conditions : Note 1 : Specified Termination Load (Differential output Data and Data Ready) : 50 ohms resistor in parallel with 1 standard ECLinPS register from Motorola, (e.g : 10E452) (Typical ECLinPS inputs shows a typical input capacitance of 1.5 pF (including package and ESD protections) If addressing an output Dmux, take care if some Digital outputs do not have the same termination load and apply corresponding derating value given below. Note 2 : Output Termination Load derating values for TOD and TDR : ~ 35 ps/pF or 50 ps per additional ECLinPS load. Note 3 :Propagation time delay derating values have also to be applied for TOD and TDR : ~ 6 ps/mm (155 ps/inch) for TSEV8388B Evaluation Board. Apply proper time delay derating value if a different dielectric layer is used. 7.1.2. PROPAGATION TIME CONSIDERATIONS TOD and TDR Timing values are given from pin to pin and DO NOT include the additional propagation times between device pins and input/output termination loads. For the TSEV8388B Evaluation Board, the propagation time delay is 6ps/mm (155ps/inch) corresponding to 3.4 (@10GHz) dielectric constant of the RO4003 used for the Board. If a different dielectric layer is used (for instance Teflon), please use appropriate propagation time values. TD does NOT depend on propagation times because it is a differential data. (TD is the time difference between Data Ready output delay and digital Data output delay) TD is also the most straightforward data to measure, again because it is differential : TD can be measured directly onto termination loads, with matched Oscilloscopes probes. 7.1.3. TOD - TDR VARIATION OVER TEMPERATURE Values for TOD and TDR track each other over temperature (1 percent variation for TOD - TDR per 100 degrees Celsius temperature variation). Therefore TOD - TDR variation over temperature is negligible. Moreover, the internal (onchip) and package skews between each Data TODs and TDR effect can be considered as negligible. Consequently, minimum values for TOD and TDR are never more than 100 ps apart. The same is true for the TOD and TDR maximum values. In other terms : If TOD is at 1150 ps, TDR will not be at 1620 ps ( maximum time delay for TDR ). If TOD is at 1660 ps, TDR will not be at 1110 ps ( minimum time delay for TDR ) However, external TOD - TDR values may be dictated by total digital datas skews between every TODs (each digital data) and TDR : MCM Board , bonding wires and output lines lengths differences, and output termination impedance mismatches. The external (on board) skew effect has NOT been taken into account for the specification of the minimum and maximum values for TOD-TDR. 7.1.4. PRINCIPLE OF OPERATION The Analog input is sampled on the rising edge of external clock input (CLK,CLKB) after TA (aperture delay) of typically 250ps . The digitized data is available after 4 clock periods latency (pipeline delay (TPD)), on clock rising edge, after 1360 ps typical propagation delay TOD. The Data Ready differential output signal frequency (DR,DRB) is half the external clock frequency, that is it switches at the same rate as the digital outputs. The Data Ready output signal (DR,DRB) switches on external clock falling edge after a propagation delay TDR of typically 1320 ps. A Master Asynchronous Reset input command DRRB ( ECL compatible single-ended input) is available for initializing the differential Data Ready output signal ( DR,DRB ) .This feature is mandatory in certain applications using interleaved ADCs or using a single ADC with demultiplexed outputs. Actually, without Data Ready signal initialization, it is impossible to store the output digital datas in a defined order. Product Specification 27 Product Specification 7.2. PRINCIPLE OF DATA READY SIGNAL CONTROL BY DRRB INPUT COMMAND 7.2.1. DATA READY OUTPUT SIGNAL RESET The Data Ready signal is reset on falling edge of DRRB input command, on ECL logical low level (-1.8V). DRRB may also be tied to VEE = - 5V for Data Ready output signal Master Reset. So long DRRB remains at logical low level, (or tied to VEE = - 5V), the Data Ready output remains at logical zero and is independant of the external free running encoding clock. The Data Ready output signal (DR,DRB) is reset to logical zero after TRDR= 920 ps typical. TRDR is measured between the -1.3V point of the falling edge of DRRB input command and the zero crossing point of the differential Data Ready output signal (DR,DRB). The Data Ready Reset command may be a pulse of 1 ns minimum time width. 7.2.2. DATA READY OUTPUT SIGNAL RESTART The Data Ready output signal restarts on DRRB command rising edge, ECL logical high levels (-0.8V). DRRB may also be Grounded, or is allowed to float, for normal free running Data Ready output signal. The Data Ready signal restart sequence depends on the logical level of the external encoding clock, at DRRB rising edge instant : 1) The DRRB rising edge occurs when external encoding clock input (CLK,CLKB) is LOW : The Data Ready output first rising edge occurs after half a clock period on the clock falling edge, after a delay time TDR = 1320 ps already defined hereabove. The DRRB rising edge occurs when external encoding clock input (CLK,CLKB) is HIGH : The Data Ready output first rising edge occurs after one clock period on the clock falling edge, and a delay TDR = 1320ps. 2) Consequently, as the analog input is sampled on clock rising edge, the first digitized data corresponding to the first acquisition ( N ) after Data Ready signal restart ( rising edge ) is always strobed by the third rising edge of the data ready signal. The time delay (TD1) is specified between the last point of a change in the differential output data (zero crossing point) to the rising or falling edge of the differential Data Ready signal (DR,DRB) (zero crossing point). Note 1 : For normal initialization of Data Ready output signal, the external encoding clock signal frequency and level must be controlled. It is reminded that the minimum encoding clock sampling rate for the ADC is 10 MSPS and consequently the clock cannot be stopped. Note 2 : One single pin is used for both DRRB input command and die junction temperature monitoring. Pin denomination will be DRRB/DIOD.( On former version denomination was DIOD. ) Temperature monitoring and Data Ready control by DRRB is not possible simultaneously. 7.3. ANALOG INPUTS (VIN) (VINB) The analog input Full Scale range is 0.5 Volts peak to peak (Vpp), or -2 dBm into the 50 ohms termination resistor. In differential mode input configuration, that means 0.25 Volt on each input, or +/- 125 mV around zero volt. The input common mode is GROUND. The typical input capacitance is 3 pF for TS8388B in CQFP package. The input capacitance is mainly due to the package.(note : the ESD protections are not connected(but present) on the inputs. Differential inputs voltage span [mV] VIN 125 250 mV 500mV Full Scale analog input VINB -250 mV 0 Volt t -125 (VIN,VINB) = +/- 250 mV = 500 mV diff Differential versus single ended analog input operation The TS8388BFS can operate at full speed in either differential or single ended configuration. This is explained by the fact the ADC uses a high input impedance differential preamplifier stage, (preceeding the Sample and hold stage), which has been designed in order to be entered either in differential mode or single-ended mode. 28 TS8388BFS TS8388BFS This is true so long as the out of phase analog input pin VINB is 50 ohms terminated very closely to one of the neighboring shield ground pins (52, 53, 58, 59) which constitute the local ground reference for the inphase analog input pin (VIN). Thus the differential analog input preamplifier will fully reject the local ground noise ( and any capacitively and inductively coupled noise) as common mode effects. In typical single-ended configuration, enter on the (VIN) input pin, with the inverted phase input pin (VINB) grounded through the 50 ohms termination resistor. In single-ended input configuration, the in-phase input amplitude is 0.5 Volt peak to peak,centered on 0V. (or -2 dBm into 50 ohms.) The inverted phase input is at ground potential through the 50 ohms termination resistor. However, dynamic performances can be somewhat improved by entering either analog or clock inputs in differential mode. Typical Single ended analog input configuration [mV] VIN 250 500 mV Full Scale analog input VIN or VINB double pad (pins 54, 55 or 56, 57) VIN or VINB 500 mV VINB = 0V VINB 3 pF t -250 VIN = +/- 250 mV 500 mV diff 7.4. 1M 50 (external) 50 reverse termination CLOCK INPUTS (CLK) (CLKB) The TS8388BFS can be clocked at full speed without noticeable performance degradation in either differential or single ended configuration. This is explained by the fact the ADC uses a differential preamplifier stage for the clock buffer, which has been designed in order to be entered either in differential or single-ended mode. Recommended sinewave generator characteristics are typically -120 dBc/Hz phase noise floor spectral density, @ 1 KHz from carrier , assuming a single tone 4 dBm input for the clock signal. 7.4.1. SINGLE ENDED CLOCK INPUT (GROUND COMMON MODE) Although the clock inputs were intended to be driven differentially with nominal -0.8V / -1.8V ECL levels, the TS8388BFS clock buffer can manage a single-ended sinewave clock signal centered around 0 Volt. This is the most convenient clock input configuration as it does not require the use of a power splitter. No performance degradation ( e.g. : due to timing jitter) is observed in this particular single-ended configuration up to 1.2GSPS Nyquist conditions ( Fin = 600 MHz ). This is true so long as the inverted phase clock input pin is 50 ohms terminated very closely to one of the neighbouring shield ground pin, which constitutes the local Ground reference for the inphase clock input. Thus the TS8388BFS differential clock input buffer will fully reject the local ground noise ( and any capacitively and inductively coupled noise) as common mode effects. Moreover, a very low phase noise sinewave generator must be used for enhanced jitter performance. The typical inphase clock input amplitude is 1 Volt peak to peak, centered on 0 Volt (ground) common mode. This corresponds to a typical clock input power level of 4 dBm into the 50 ohms termination resistor. Do not exceed 10 dBm to avoid saturation of the preamplifier input transistors. The inverted phase clock input is grounded through the 50 ohms termination resistor. Product Specification 29 Product Specification Single ended Clock input (Ground common mode) VCLK common mode = 0 Volt VCLKB=0 Volt 4 dBm typical clock input power level (into 50 ohms termination resistor) [V] CLK or CLKB double pad (pins 37, 38 or 39, 40) VCLK +0.5V CLK or CLKB VCLKB = ( 0 V ) t -0.5V 1M 50 (external) 0.4 pF 50 reverse termination Note 1 : Do not exceed 10 dBm into the 50 ohms termination resistor for single clock input power level. 7.4.2. DIFFERENTIAL ECL CLOCK INPUT The clock inputs can be driven differentially with nominal -0.8V / -1.8V ECL levels. In this mode, a low phase noise sinewave generator can be used to drive the clock inputs, followed by a power splitter (hybrid junction) in order to obtain 180 degrees out of phase sinewave signals. Biasing tees can be used for offseting the common mode voltage to ECL levels. Note : As the biasing tees propagation times are not matching, a tunable delay line is required in order to ensure the signals to be 180 degrees out of phase especially at fast clock rates in the GSPS range. Differential Clock inputs (ECL Levels) [mV] -0.8V VCLK CLK or CLKB double pad (pins 37, 38 or 39, 40) VCLKB Common mode = -1.3 V CLK or CLKB 1M 50 (external) 0.4 pF -2V -1.8V t 50 reverse termination 7.4.3. SINGLE ENDED ECL CLOCK INPUT In single-ended configuration enter on CLK ( resp. CLKB ) pin , with the inverted phase Clock input pin CLKB (respectively CLK) connected to 1.3V through the 50 ohms termination resistor. The inphase input amplitude is 1 Volt peak to peak, centered on -1.3 Volt common mode. Single ended Clock input (ECL): VCLK common mode = -1.3 Volt. VCLKB = -1.3 Volt 30 TS8388BFS TS8388BFS [V] -0.8V VCLK VCLKB = -1.3 V -1.8V t Product Specification 31 Product Specification 7.5. NOISE IMMUNITY INFORMATIONS Circuit noise immunity performance begins at design level. Efforts have been made on the design in order to make the device as insensitive as possible to chip environment perturbations resulting from the circuit itself or induced by external circuitry. (Cascode stages isolation, internal damping resistors, clamps, internal (onchip) decoupling capacitors.) Furthermore, the fully differential operation from analog input up to the digital outputs provides enhanced noise immunity by common mode noise rejection. Common mode noise voltage induced on the differential analog and clock inputs will be canceled out by these balanced differential amplifiers. Moreover, proper active signals shielding has been provided on the chip to reduce the amount of coupled noise on the active inputs : The analog inputs and clock inputs of the TS8388BFS device have been surrounded by ground pins, which must be directly connected to the external ground plane. 7.6. DIGITAL OUTPUTS The TS8388BFS differential output buffers are internally 75 ohms loaded. The 75 ohms resistors are connected to the digital ground pins through a -0.8v level shift diode (see Figures 3,4,5 on next page). The TS8388BFS output buffers are designed for driving 75 ohms (default) or 50 ohms properly terminated impedance lines or coaxial cables. An 11 mA bias current flowing alternately into one of the 75 ohms resistors when switching ensures a 0.825 V voltage drop across the resistor (unterminated outputs). The VPLUSD positive supply voltage allows the adjustment of the output common mode level from -1.2V (VPLUSD=0V for ECL output compatibility) to +1.2V (VPLUSD=2.4V for LVDS output compatibility). Therefore, the single ended output voltages vary approximately between -0.8V and -1.625V, ( outputs unterminated ), around -1.2V common mode voltage. Three possible line driving and back-termination scenarios are proposed (assuming VPLUSD=0V) : 1 ) 75 Ohms impedance transmission lines, 75 ohms differentially terminated (Fig. 3) : Each output voltage varies between -1V and -1.42V (respectively +1.4V and +1V), leading to +/- 0.41V =0.825 V in differential, around -1.21 V (respectively +1.21V) common mode for VPLUSD=0V (respectively 2.4V). 2 ) 50 ohms impedance transmission lines, 50 ohms differentially termination (Fig. 4) : Each output voltage varies between -1.02V and -1.35V (respectively +1.38V and +1.05V), leading to +/- 0.33V=660 mV in differential, around 1.18V (respectively +1.21V) common mode for VPLUSD=0V (respectively 2.4V). 3 ) 75 ohms impedance open transmission lines (Fig. 5) : Each output voltage varies between -1.6 V and -0.8 V (respectively +0.8V and +1.6V), which are true ECL levels, leading to +/- 0.8V=1.6V in differential, around -1.2V (respectively +1.2V) common mode for VPLUSD=0V (respectively 2.4V). Therefore, it is possible to drive directly high input impedance storing registers, without terminating the 75 ohms transmission lines. In time domain, that means that the incident wave will reflect at the 75 ohms transmission line output and travel back to the generator ( i.e. the 75 ohms data output buffer ). As the buffer output impedance is 75 ohms, no back reflection will occur. Note : This is no longer true if a 50 ohms transmission line is used, as the latter is not matching the buffer 75 ohms output impedance. Each differential output termination length must be kept identical . It is recommended to decouple the midpoint of the differential termination with a 10 nF capacitor to avoid common mode perturbation in case of slight mismatch in the differential output line lengths. Too large mismatches ( keep < a few mm ) in the differential line lengths will lead to switching currents flowing into the decoupling capacitor leading to switching ground noise. The differential output voltage levels ( 75 or 50 ohms termination ) are not ECL standard voltage levels, however it is possible to drive standard logic ECL circuitry like the ECLinPS logic line from MOTOROLA. At sampling rates exceeding 1GSPS, it may be difficult to trigger the HP16500 or any other Acquisition System with digital outputs. It becomes necessary to regenerate digital data and Data Ready by means of external amplifiers, in order to be able to test the TS8388BFS at its optimum performance conditions. 32 TS8388BFS TS8388BFS 7.6.1. DIFFERENTIAL OUTPUT LOADING CONFIGURATIONS (LEVELS FOR ECL COMPATIBILITY) VPLUSD = 0V -0.8V 75 Out 75 75 Differential output : 0.41V = 0.825V 75 - 75 impedance + 10 nF -1V / -1.41V Common mode level : -1.2V (-1.2V below VPLUSD level) 75 OutB -1.41V / -1V 11 mA DVEE Figure 3 : DIFFERENTIAL OUTPUT : 75 TERMINATED VPLUSD = 0V -0.8V 75 Out 50 75 Differential output : 0.33V = 0.660V 50 - 50 impedance + 10 nF -1.02V / -1.35V Common mode level : -1.2V (-1.2V below VPLUSD level) 50 OutB -1.35V / -1.02V 11 mA DVEE Figure 4 : DIFFERENTIAL OUTPUT : 50 TERMINATED VPLUSD = 0V -0.8V 75 Out 75 75 75 + impedance VPLUSD = 2.4V - -0.8V / -1.6V Differential output : 0.8V = 1.6V Common mode level : -1.2V (-1.2V below VPLUSD level) OutB 11 mA 1.6V 75 DVEE 7.6.1. -1.6V / -0.8V Out 75 75 1.4V / 0.99V Differential output : Figure 5 : DIFFERENTIAL OUTPUT : OPEN LOADED 75 0.41V = 0.825V FOR LVDS COMPATIBILITY) Common mode level : -1.2V DIFFERENTIAL OUTPUT LOADING CONFIGURATIONS (LEVELS 75 10 nF + 75 impedance (-1.2V below VPLUSD level) OutB 0.99V / 1.4V 11 mA Product Specification DVEE Figure 6 : DIFFERENTIAL OUTPUT : 75 TERMINATED 33 Product Specification VPLUSD = 2.4V 1.6V 75 Out 50 75 Differential output : 0.33V = 0.660V 50 - + 50 impedance 10 nF 1.38V / 1.05V Common mode level : -1.2V (-1.2V below VPLUSD level) 50 OutB 1.05V / 1.38V 11 mA DVEE Figure 7 : DIFFERENTIAL OUTPUT : 50 TERMINATED VPLUSD = 2.4V 1.6V 75 Out 75 75 - + 75 impedance 1.6V / 0.8V Differential output : 0.8V = 1.6V Common mode level : -1.2V (-1.2V below VPLUSD level) OutB 0.8V / 1.6V 11 mA DVEE 7.7. Figure 8 : DIFFERENTIAL OUTPUT : OPEN LOADED OUT OF RANGE BIT An Out of Range (OR,ORB) bit is provided that goes to logical high state when the input exceeds the positive full scale or falls below the negative full scale. When the analog input exceeds the positive full scale, the digital output datas remain at high logical state, with (OR,ORB) at logical one. When the analog input falls below the negative full scale, the digital outputs remain at logical low state, with (OR,ORB) at logical one again. 7.8. GRAY OR BINARY OUTPUT DATA FORMAT SELECT The TS8388BFS internal regeneration latches indecision (for inputs very close to latches threshold) may produce errors in the logic encoding circuitry and leading to large amplitude output errors. This is due to the fact that the latches are regenerating the internal analog residues into logical states with a finite voltage gain value (Av) within a given positive amount of time (t) : Av= exp((t)/) , with the positive feedback regeneration time constant. The TS8388BFS has been designed for reducing the probability of occurence of such errors to approximately 10 TS8388BFS at 1GSPS). -13 (targetted for the A standard technique for reducing the amplitude of such errors down to +/-1 LSB consists to output the digital datas in Gray code format. -13 Though the TS8388BFS has been designed for featuring a Bit Error Rate of 10 with a binary output format, it is possible for the user to select between the Binary or Gray output data format, in order to reduce the amplitude of such errors when occuring, by storing Gray output codes. Digital Datas format selection : BINARY output format if GORB is floating or VCC. GRAY output format if GORB is connected to ground (0V). 7.9. DIODE PIN 49 One single pin is used for both DRRB input command and die junction monitoring. The pin denomination is DRRB/DIOD. Temperature monitoring and Data Ready control by DRRB is not possible simultaneously. 34 TS8388BFS TS8388BFS (See section 7.2 for Data Ready Reset input command). The operating die junction temperature must be kept below145 C, therefore an adequate cooling system has to be set up. The diode mounted transistor measured Vbe value versus junction temperature is given below. 1000 960 920 VBE (mV) 880 840 800 760 720 680 640 600 -55 -35 -15 5 25 45 65 85 105 125 Junction temperature (deg.C) Product Specification 35 Product Specification 7.10. ADC GAIN CONTROL PIN 60 The ADC gain is adjustable by the means of the pin 60 (input impedance is 1M in parallel with 2pF) The gain adjust transfert function is given below : 1,20 1,15 ADC Gain 1,10 1,05 1,00 0,95 0,90 0,85 0,80 -500 -400 -300 -200 -100 0 100 200 300 400 500 Vgain (command voltage) (mV) Note : A specific document "DEMUX and ADCs APPLICATION NOTES" has been edited and is available ... 36 TS8388BFS TS8388BFS 8. EQUIVALENT INPUT / OUTPUT SCHEMATICS 8.1. EQUIVALENT ANALOG INPUT CIRCUIT AND ESD PROTECTIONS VCC=+5V VCC -0.8V GND=0V VCLAMP= +2.4V -0.8V -5.8V GND -5.8V +1.65V 50 VEE 50 E21V E21V 200 VIN Pad capacitance 340fF 5.8V 200 VEE VINB Pad capacitance 340fF -1.55V 0.8V VEE=-5V Note : the ESD protection equivalent capacitance is 150 fF. 8.2. EQUIVALENT ANALOG CLOCK INPUT CIRCUIT AND ESD PROTECTIONS VCC VCC=+5V +0.8V -5.8V -5.8V -5.8V -5.8V GND=0V -5.8V -5.8V VEE CLK VEE 150 Pad capacitance 340fF 150 5.8V 5.8V 380 A CLKB Pad capacitance 340fF 380 A 0.8V 0.8V VEE=-5V Note : the ESD protection equivalent capacitance is 150 fF. Product Specification 37 Product Specification 8.3. EQUIVALENT DATA OUTPUT BUFFER CIRCUIT AND ESD PROTECTIONS VPLUSD=0V to 2.4V -5.8V -5.8V 75 75 VEE VEE OUTB OUT Pad capacitance 180 fF 5.8V Pad capacitance 180 fF 5.8V I=11mA -3.7V 0.8V 0.8V 0.8V 0.8V DVEE=-5V VEE=-5V VEE=-5V Note : the ESD protection equivalent capacitance is 150 fF. 8.4. ADC GAIN ADJUST EQUIVALENT INPUT CIRCUITS AND ESD PROTECTIONS VCC VCC=+5V -0.8 V NP1032C2 -0.8 V +1.6V VEE 1 k 0.8V 0.8V 5.8V VEE 2 pF 2 pF GND GND 500 A 500 A VEE=-5V Note : the ESD protection equivalent capacitance is 150 fF. 38 TS8388BFS VEE 1 k GA Pad capacitance 180 fF NP1032C2 -5.8 V -5.8 V GAB 0.8V Pad capacitance 180 fF 0.8V 5.8V VEE TS8388BFS 8.5. GORB EQUIVALENT INPUT SCHEMATIC AND ESD PROTECTIONS GORB: gray or binary select input; floating or tied to VCC -> binary VCC=+5V -0.8V 1 k 1 k -0.8V 1 k -5.8V VEE GORB 5 k Pad capacitance 180fF 5.8V 5.8V 250 A 250 A 5.8V VEE=-5V GND=0V Note : the ESD protection equivalent capacitance is 150 fF. 8.6. DRRB EQUIVALENT INPUT SCHEMATIC AND ESD PROTECTIONS VCC=+5V Actual protection range: 6.6V above VEE, In fact stress above GND are clipped by the CB diode used for Tj monitoring GND=0V NP1032C2 10 k DRRB -1.3V 200 Pad capacitance 180 fF -2.6V 5.8 V VEE 0.8 V VEE=-5V Note : the ESD protection equivalent capacitance is 150 fF. Product Specification 39 Product Specification 9. TSEV8388BFS : DEVICE EVALUATION BOARD For complete specification, see separate TSEV8388BFS document. GENERAL DESCRIPTION The TSEV8388BFS Evaluation Board (CEB) is a board which has been designed in order to facilitate the evaluation and the characterization of the TS8388BFS device up to its 1.5 GHz full power bandwidth at up to 1 Gsps in the military temperature range. The high speed of the TS8388BFS requires careful attention to circuit design and layout to achieve optimal performance. This four metal layer board with internal ground plane has the adequate functions in order to allow a quick and simple evaluation of the TS8388BFS ADC performances over the temperature range. The TSEV8388BFS Evaluation Board is very straightforward as it only implements the TS8388BFS ADC, SMA connectors for input / output accesses and a 2.54 mm pitch connector compatible with HP16500C high frequency probes. The board also implements a de-embedding fixture in order to facilitate the evaluation of the high frequency insertion loss of the input microstrip lines, and a die junction temperature measurement setting. The board is constituted by a sandwich of two dielectric layers, featuring low insertion loss and enhanced thermal characteristics for operation in the high frequency domain and extended temperature range. The board dimensions are 130 mm x 130 mm. The board set comes fully assembled and tested, with the TS8388BFS in CQFP68 package installed. 40 TS8388BFS TS8388BFS 10. ORDERING INFORMATION 10.1. PACKAGE DEVICE TS 8388B M FS 9 N B 3 Lot acceptance test : Manufacturer prefix 1 : LAT 1 2 : LAT 2 3 : LAT 3 As described in ESA/SCC 9000 Device or family Temperature range : ESA/SCC 9000 specification : M : -55 < Tc ; Tj < 125C B : Level B selection C : Level C selection Package : Qualification status : N : Non ESA/SCC qualified Q : ESA/SCC qualified FS : Enhanced Rth CQFP68 gullwing Screening according to ESA/SCC 9000 B/Q : Mil-PRF-38535, QML level Q According to DSCC number 5962_0050401 Q4C 10.2. EVALUATION BOARD TS (X) EV 8388B F ZA2 Prototype board Evaluation board prefix ZA2 : with MC100EL16 digital receivers Std CQFP68 package The evaluation board is delivered with an ADC and includes the heat sink. Product Specification 41 Product Specification Atmel Headquarters Atmel Operations Corporate Headquarters Atmel Colorado Springs 2325 Orchard Parkway San Jose, CA 95131 TEL (408) 441-0311 FAX (408) 487-2600 1150 E. Cheyenne Mtn. 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For further information, please contact : Atmel Grenoble - Route Departementale 128 - BP 46 - 91901 Orsay Cedex - France Phone +33 (0) 1 69 33 03 24 - Fax +33 (0) 1 69 33 03 21 Email monique.lafrique@gfo.atmel.com - Web site http://www.atmel-grenoble.com For further technical information, please contact the technical support : Email HOTLINE-BDC@gfo.atmel.com 42 TS8388BFS