TDC1034 ractid Digital-to-Analog Converter 4-Bit, 200MHz The TRW TDC1034 is a 4-bit D/A converter, designed Power Supply Noise Rejection >50dB for 200MHz operation and is capable of directly driving 4 Registered Data And Video Controls 75 Ohm load to standard video levels. Most applications =, Differential Current Outputs require no extra registering, buffering, or deglitching. ; Three special level controls make the device ideal for Video Controls: SYNC, BLANK, BRight video applications. All data and control inputs are ECL Low Glitch Energy compatible. ECL Compatible, Can Be Used In TTL Systems The TDC1034 is built with TRW's OMICRON-B * Low Power Dissipation 1-micron bipolar process. On-chip data registers and * Available In An 18 Pin CERDIP Package precise matching of propagation delays insure low glitch Single 5.2V Power Supply energy. The TDC1034 offers high performance, low oo. power consumption, and video compatibility in an 18 pin Applications CERDIP package. e CAD/CAM Workstations Features e RGB Graphics e Raster Scan Displays Digital Synthesizers e Automated Test Equipment Digital Transmitters/Modulators e "Graphics-Ready 200MHz Conversion Rate e 1/8 LSB Linearity Functional Block Diagram srt >] i. OUT+ 4 CONTROL > REGISTER CT" CONCH _ BLANK, Loic SWITCHES > OuT- BRT, cts SYNC 3 2 REFERENCE , CURRENT conv, CONV x z SOURCE + - tt ft fF A K A A A KOA Veep Veco Veen Veca REF+ REF- COMP 8-63 TRW LSI Products Inc. Phone: {619} 457-1000 STRW Inc. 1990 PO. Box 2472 FAX: (619) 455-6314 40601419 Rev. E-11/90 la Jolla, CA 92038 Printed in the U.S.A.TDC1034 7 IXY Pin Assignments D3 1 18 Dg (LSB) Dy 2 17. Dy (MSB) Veep 3 16 VEEA CONV 4 15 OUT+ CONV 5 14 OUT- Veco 13 Veca BLANK 7 1 12 COMP BRT 8 11 REF+ SYNC 9 10 REF- 18 Pin CERDIP B8 Package Functional Description General Information The TDC1034 develops complementary analog output currents proportional to the product of the digital input data and analog reference current. All data and control inputs are compatible with standard ECL logic levels. Each rising edge of the CONVert clock (CONV) latches data and control values into an internal D-type register. The registered values are then converted into an analog output by switched current sinks. The TDC1034 uses a segmented circuit design scheme in which the input data is decoded into a parallel Thermometer code, which drives fifteen identical current sinks to produce sixteen output levels. Special control inputs, SYNC, BLANK and BRigHT (BRT), drive appropriately weighted current sinks which add to the output current to produce specific output levels especially useful in video applications. Power To provide highest noise immunity, the TDC1034 operates from separate analog and digital power supplies, Veca and Veep, respectively. Since the required voltage for both Vega and Veep is 5.2V, these may ultimately be cannected to the same power source, but high-frequency decoupling for each supply is recommended. A typical decoupling network is shown in Figure 7. The return for IEED, the current drawn from the VEEp supply, is Vecp. The return for IEga is Veca. All Veg and Vee pins MUST be connected. p-64 Although the TDC1034 is specified for a nominal supply of ~5.2V, operation from a +5.0V supply is possible provided that the relative polarities of all voltages are correctly maintained. For additional information concerning the use of ECL D/A converters in a +5V system, refer to TRW Application Note TP-33 Using the TDC1018 and TDC1034 in a TTL Environment. Reference The TDC1034 has two reference inputs: REF+ and REF, which are noninverting and inverting inputs to an internal reference buffer amplifier. The output of this operational amplifier serves as a reference for the current sinks. The feedback loop is internally connected around one of the current sinks to achieve high accuracy (see Figure 4). The analog output currents are proportional to the digital data and reference current, Ipr. The full-scale output value may be adjusted over a limited range by varying the reference current. Accordingly, the stability of the analog output depends primarily upon the stability of the reference. A method of achieving a stable reference is shown in Figure 7. The reference current flows into the REF+ input, while REF is typically connected to a negative reference voltage through a resistor chosen to minimize input offset current effects. A COMPensation input (COMP), is provided for external compensation of the 1DC1034s reference amplifier. A capacitor (Cc) should be connected between COMP and the Vega supply, keeping lead lengths as short as possible. The value of the compensation capacitor determines the effective bandwidth of the amplifier. In general, decreasing Cc increases bandwidth and decreases amplifier stability. For applications in which the reference is constant, Cc should be large, while smaller values of Cc may be chosen when dynamic modulation of the reference is required. Controls The TDC1034 has three special video control inputs: SYNC, BLANK and BRighT (BRT). All controls are standard ECL level compatible, and include internal pulldown resistors to force unused controls to a logic LOW (inactive} state. TRW LSI Products Inc.TDC1034 arte Controls (cont.} The video control inputs are registered by the rising edge Valid data must be present at the input a setup time ts of the CONV clock in a manner similar to the data before, and a hold time ty after the rising edge of inputs. These inputs, like data, must be valid for a setup CONV. time of ts before, and a hold time of ty after the rising edge of CONV in order to be registered. Convert CONVert (CONV) is a differential ECL compatible clock levels which are used for frame synchronization, input whose rising edge synchronizes data and control . horizontal blanking, etc., as described in video system entry into the TDC1034. Within the constraints shown in standards such as RS-170 and RS-343A. The effect of Figure 2 the actual switching threshold of CONV is the video controls on the analog outputs is shown in noterminet Oy WY tag. cok te aren Nea Table 1. Internal logic governs the interaction of these Th sas ile h Oa de 6 las th eit Be controls to simplify their use in video applications. @ Dias voltage Chosen will determine the switching BLANK and SYNC override the data inputs. SYNC me of CONV. rowever for best performance, overrides all other inputs, and produces full-scale output. oN must be driven differentially. This will minimize The BRT control creates a whiter than white level by Both Nock and power supply Output intermodulation. adding 10% of the full-scale value to the present output oth clack inputs must normally be connected. level, and is especially useful in graphics display for highlighting cursors, warning messages, or menus. For Asserting the video controls produces various output Analog Outputs non-video applications, these controls may be left The two analog outputs of the TDC1034 are high unconnected. impedance complementary current sinks which vary in proportion to the input data, controls, and reference Data Inputs current values. The outputs are capable of directly driving dual 75 Ohm loads to standard video levels. The output voltage is the product of the output current and effective load impedance, and is usually between OV and 1.07V in the standard configuration (see Figure 5}. In this case, the QUT output gives a DC shifted video output with sync down." The corresponding output from OUT+ is also DC shifted and inverted, or sync up. Data inputs to the TDC1034 are standard single-ended ECL compatible. Internal pulldown resistors force unconnected data inputs to logic LOW. Input registers are provided for synchronous data entry and lowest differential data propagation delay (skew), which minimizes glitching. TRW LSI Products Inc. &b- 65TDC1034 IX Package Interconnections Signal Signal Type Name Function Value B8 Package Pins Power VEEA Analog Supply Voltage 5.2V 16 Veep Digital Supply Voltage 5.2V 3 Veca Analog Supply Voltage 0.0V 13 Veco Digital Supply Voltage 0.0V 6 Reference REF Reference Current Input Op-Amp Virtual Ground 10 REF+ Reference Current+ Input Op-Amp Virtual Ground i COMP COMPensation Input Cc 12 Controls BLANK Video BLANK input ECL 7 BRT Video BRighT Input ECL 8 SYNC Video SYNC Input ECL 9 Data Inputs D, Data Bit 1 (MSB) ECL 17 Do ECL 18 D3 ECL 1 D4 Data Bit 4 (LSB) ECL 2 Convert CONV CONVert Clock Input ECL 4 CONV CONVert Clock Input, Complement ECL 5 Analog Outputs OUT - Output Current See Text 14 QUT + Output Current + See Text 15 Figure 1. Timing Diagram }| tpwu \ rN rrN rcmN 7 CONV -13V - _ Sr Vw New Vow CONV - tpwLe ty ty | DATA, CONTROL _ ~1aV 7 x INPUTS xX t tosc 4 | ft OuT- B- 66 { t 1/2 LSB TRW LSI Products Inc.TDC1034 aitve Figure 2. CONV, CONV Switching Levels | 0.0V STOTT TT Ts Fen Vipg xX an \N N N SO \ - os ror er eN Osa OC eer aN \ \ \ CONV . -- \ Vicm maxX - - ~ CONV Figure 3. Equivalent Input Circuit \ 1 REF- O- DATA, REF+ CONTROLS CONV l lea. et conv O*~AA--_J \ REFERENCE BIAS SEGMENT ' SWITCH VEED Figure 4. Equivalent Output Circuit CURRENT CURRENT SINK #1 SINK #N REFERENCE REFERENCE AMPLIFIER CURRENT _- reo-4 REF+ REF- LJ VEEA TRW LSI Products Inc. B~67TDC1034 are 7 IXvUr Figure 5. Standard Load Configuration VIDEO MONITOR ey 4 Veca = Veco | i BOQ | TOC1034 | | 2 INVERSE VIDEO COAX R Q -52V 2 Le LQ TEST LOAD: OUT+ VIDEO OUT ouT- 0 TO -1 VOLT = 68 TRW LSI Products Inc.TDC1034 7 Ite Absolute maximum ratings (beyond which the device may be damaged) | Supply Voltages Veep (measured to Veco! -7.0 to O.5V VEEA (measured to Vecal -7.0 to 0.5V Vega (measured te Veep) ~0.5 to 05V Voca (measured to Vecp) -0.5 to 0.5V Input Voltages CONV, Data, and Controls (measured to Vero} Veep to 0.5V Reference input, applied voltage (measured to Vocal? REF+ VEEA to 0.5V REF- VEEA to 0.5V Reference input, applied current, externally forced4 REF+ 6.0mA REF- 0.5mA Output Analog output, applied voltage (measured to Veca) OUT+ ~2.0 to +2.0V ouT- -20 to +2.0V Analog output, applied current, externally forced? OUT+ 50mA ouT- 50mA Short circuit di Unlimited sec Temperature Operating, ambient ~60 to +140C junction + 175C Lead, soldering (10 ds) +300C Storage -60 to +150C Notes: 1. Absclute maximum ratings are limiting values applied individually while all other parameters are within specified operating conditions. Functional operation under any of these conditions is NOT imphed. 2. Applied voltage must be current limited ta specified range. Forcing voltage must be limited to specified range. 4. Current is specified as conventional current when flowing into the device. TRW LSI Products Inc. 5-69TDC1034 Operating conditions Temperature Range Standard Parameter Min Nom Max Units Veep Digital Supply Voltage (measured to Vocp) ~4.75 -2 -55 Vv VEEA Analog Supply Voltage (measured to Vera) -475 -2 -5 V Veca-Yecp Supply Voltage Differential -0.1 0.0 +01 v Veea~Veep Supply Voltage Differential -0.1 0.0 +01 v Viem CONV Input Voltage, Common Mode Range (Figure 2} -05 -25 V Ving CONV Input Voltage, Differential {Figure 2} 0.3 12 v tewe CONV Pulse Width, LOW ns tpwH CONV Pulse Width, HIGH ns ts Setup Time, Data and Controls 40 ns ty Hold Time, Data and Controls 0 ns Vit Input Voltage, Logic LOW -1.49 V Vin Input Voltage, Logic HIGH ~ 1.045 v peg Reference Current Video standard output levels! 1.10 1.17 1.24 mA 6-bit linearity 10 13 mA Ce Compensation Capacitor 1000 2700 pF Ty Ambient Temperature, Still Air 0 70 a0} Note: 1. Minimum and Maximum values allowed by +5% variation given in RS343A and RS170 after intitial gain correction of device. Electrical characteristics within specified operating conditions a a a /3-10 Temperature Range Standard Parameter Test Conditions Min Max Units leeat'eep Supply Current Vega = Veep - Max, static! Ty = OC to 70C -145 mA Ty = 70C -130 mA Cher Equivalent Input Capacitance, REF+, REF pF C, Input Capacitance, Data and Controls pF Vocp Compliance Voltage, + Output -1.2 +15 V Vocn Compliance Voltage, - Output -12 +15 V Ro Equivalent Output Resistance 50 K Cg Equivalent Output Capacitance 20 pF I Max Current, + Output Vee, = Nom, SYNC = BLANK = 0, BRT = 1 30 mA OP EEA lon Max Current, - Qutput Vega = Nom, SYNC = 1 30 mA We Input Current, Logic LOW, Data and Controls Veep = Max, Vj = -1.49V 200 BA Wy Input Current, Logic HIGH, Data and Controls Veep = Max, Vj = -1.045V 200 HA iT Input Current, Convert Veep = Max, -25 << Wj < -05 50 uA Note: |. Worst case over all data and control states. TRW LSI Products Inc.TDC1034 arte Switching characteristics within specified operating conditions Temperature Range Standard Parameter Test Conditions Min Max Units Fg Maximum Data Rate Veea. Veep = Min 200 MSPS togc Clock to Output Delay Veen Veep = Min 8 fs tg Current Settling Time, Clocked Mode Vea. Veep = Min, 3.2% 5 ns try Rise Time, Current 10% to 90% of Gray Scale 20 ns System performance characteristics within specified operating conditions Temperature Range Standard Parameter Test Conditions Min | Max Units Ey Linearity Error Integral, Terminal Based Veen: Veep: Rep = Nom 08 % af Gray Scale ELp Linearity Error Differential Veca: Veep Ire = Nom 08 % of Gray Scale log Output Offset Current Veea: Veen = Max, SYNC = BLANK = 0, BRT - 1 10 uA EG Absolute Gain Error Veca, Veep = Min 6 % of Gray Scale Cg Gain Error Tempco Inge = Nom 0.01 % of Gray Scale/C BWR Reference Bandwidth, -3dB Cc = Min, Veep = ImV p-p 1 Miz PSRR Power Supply Rejection Ratio Veca, Veep. lper = Nom | 45 dB Veca. Veep. IREF = Nom? 46 dB PSS Power Supply Sensitivity Veen Veep: tree = Nom 120 HAN Ge Peak Glitch Charge 34 800 fCoulomb G Peak Glitch Current 12 mA Ge Peak Glitch Energy (Area) 4 30 pV-Sec Ftc Feedthrough Clock Data ~ Constant BW = 250MHz -36 dB BW = 50MHz -50 dB FT Feedthrough Data? CONV = Constant BW = 250MHz -42 dB BW = 50MHz -o0 dB Notes: 1. 20KHz, 0.75V p-p ripple superimposed on Vea, Veg; 0B relative to full gray scale. 2. G0Hz, 0.75V pp ripple superimposed on 3. fCoulombs = microamps x nanoseconds. 4. 37.5Q load. Because glitches tend to be symmetric, average glitch energy approaches zero. 5. dB relative to full gray scale. TRW LSI Products Inc. Veea, Veep: dB relative to full gray scale. B-n GuTDC1034 art Table 1 Video Control Truth Table Syne Blank Bright Data Input OQut (mA)! Out- (v)2 Out- (IRE)3 Description 4 1 X X x 28.57 -1071 -4 Sync Level 0 1 x x 20.83 ~0.781 0 Blank Level 0 0 0 0000 19.40 -0.728 75 Normal Low Level 0 0 0 ni 195 -0.073 100 Normal High Level 0 0 1 co00 17.44 ~ 0.654 75 Enhanced Low Level 0 0 1 111 0.00 0.00 110 Enhanced High Level Notes: 1. Qut+ is camplementary to Cut~. Current is specified as conventional current when flowing into the device. 2. Voltage produced when driving the standard toad configuration (37.5 Ohms to Vocal. See Figure 5. 3. 140 (RE units = 1.00V. 4 AS-343-A tolerance on all control values is assumed. Figure 6. Video Output Waveform for Qut and Standard Load Configuration RE mv! 110 Q 100 -3 75-728 Qo -781 -4 ~1071 BRIGHT NORMAL HIGH (WHITE) NORMAL LOW (BLACK) Note: 1. Output voltage is measured with standard toad connected between Out- and Veca- Figure 7. Typical Interface Circuit [-72 . MsB ue cl Om 01 VIDEG _m D2 FERRITE DATA BEAD (EC) __-m 03 Li INDUCTOR isp DECOUPLING oO" ca a VeEA ry . , outs 52v FED % Bo fi Tw wr a 2 Ag COAX pe Toc103 os] Sao uw Sel CONVert com Veca CONVert 6 NV comp vu a mo SYNC REF+ AW A A VIDEO 2 4 CONTROLS 4 -(7)-] BLANK 1K D (ecu REF -}wv (1)J art PA vet 70 ims UY Low @ = ECL TERMINATION TRW LSI Products Inc.TDC1034 art? Ordering Information Product Temperature Range Screening Package Package Number Marking TDC1034B8C STD-Ta=0C to 70C Commercial 18 Pin CERDIP 1034B8C All parameters contained in this specification are guaranteed by design, characterization, sample testing cr 100% testing as appropriate. TRW reserves the right to change products and specifications without notice. This information does not convey any license under patent rights of TRW inc. or others. Life Support Policy TRW LSi Products Inc. components are not designed for use in life support applications, wherein a failure or malfunction of the component can reasonably be expected to result in personal injury. The user of TRW LSI Products Inc. components in life support applications assumes all risk of such use and indemnifies TRW LSI Products Inc. against all damages. Gu TRW LSI Products Inc. B-