A EE SE ES SRE ORS FEATURES * 12-Bit resolution + 8-or 20-Microseconds conversions + 5 Input ranges + Internal high Z buffer Short-cycle operation GENERAL DESCRIPTION The ADC-HX12B and ADC-HZ12B are self-contained, high performance, 12-bit A/D converters manufactured with thick-and thin-film hybrid technology. They use the successive approximation conversion technique to achieve a 12-bit conversion in 20 and 8 microseconds respectively. Five input voltage ranges are programmable by external pin connection: 0 to +5V, 0 to +10V, +2.5V, +5V, and +10V. An internal buffer amplifier is also provided for applications where 100 megohm input impedance is required. These converters utilize a fast 12-bit monolithic DAC which includes a precision zener reference source. The circuit also contains a fast monolithic comparator, a monolithic 12-bit successive approximation register, a clock and a monolithic buffer amplifier. Nonlinearity is specified at +/e2 LSB maximum. Both models have identical operation except for conversion speed. They can be short-cycled to give faster conversion in lower resolution applications. Use of the internal buffer amplifier increases conversion time by 3 microseconds, the settling time of the amplifier. Output coding is complementary binary, complementary offset binary, or complementary twos complement. Serial data is also brought out. The package is a 32-pin ceramic case. ROS + 18V - REF +5V POWER POWER OUT POWER BUFFER BUFFER AMPLIFIER IwPUT + PRECISION GAIN REF (+ 6.3) ADS BUFFER OUTPUT BIPOLAR OFFSET COMPAR INPUT DIGITAL 12 BIT DAC CoM COMPARATOR tov SHORT INPUT CYCLE a SUCCESSIVE e0C 2ov APO MERON (STATUS) INPUT ANALOG COM 7 HTB K4 TEKS? CLOCK CLOCK START 12 1110 9 B 6543921 SERIAL RATE OUT CONV. igg BiT NO Msp SB, DATA PARALLEL DATA OUT For Immediate Assistance, Dial 1-800-233-2765 ADC-HX, ADC-HZ Series 12-Bit, Analog-to- Digital Converters Un ies See ee On Oe ees MECHANICAL DIMENSIONS INCHES (MM) 1.101 (ean) max al 0.150 MIN (3.8) !: _t_ te . 0.010 x 0.160 (4 1} KOVAR 16 17 1.600 ' I ! ' , | t , | ' , , ' tlisspaces _! ' BOTTOM tl atorooea 1712 VIEW of (43.5) MAX : I ' ' ' 1 | f ' 1 i OOT ON TOP ' ' REFERENCES *] #1 aaa] - 0.100 PIN + 1 0,900 __ 1, 0.100 (22,8) {2.5) NOTE: PINS HAVE 0.025 INCH STANDOFF FROM CASE. + 0.01 INPUT/OUTPUT CONNECTIONS PIN FUNCTION PIN FUNCTION 1 BIT 12 OUT {LSB} 7 CLOCK RATE 2 BIT 11 OUT 18 REF OUT 3 BIT 10 OUT 19 CLOCK OUT a BIT 9 OUT 20 EOC (STATUS) 5 BIT 8 OUT 2a START CONVERT 6 BIT ? OUT 22 COMPAR INPUT ? BIT 6 OUT 2 BIPOLAR OFFSET 8 BIT 5 OUT 24 10V RANGE BIT 4 OUT 25 20V RANGE 10 BIT 3 OUT 26 ANALOG COM Wt BIT 2 OUT 27 GAIN ADS 12 BIT 1 OUT (MSB! 28 + 1S POWER 13 IT 1 OUT (MSB) 29 BUFFER OUTPUT 14 SHORT CYCLE wn BUFFER INPUT 15 DIGITAL COM at ~ 18V POWER 16 + 5V POWER 32 SERIAL OUTPUT 2-55ADC-HX, ADC-HZ a FUNCTIONAL SPECIFICATIONS Typical at 25C, + 15V and +5V supplies unless otherwise noted. iS (VAN EIL PHYSICAL/ENVIRONMENTAL INPUTS ADC-HX12B ADC-HZ12B Analog Input Ranges, unipolar . . Analog Input Ranges, bipolar .... Input Impedance .............. Input Impedance with Buffer ..... Input Bias Current of Buffer...... Input Overvoltage ............. Start Conversion .............. - Oto +5V, 0 to +10V FS +2.5V, +5V, +10V FS 2.5K (0 to +5V, +2.5V) 5K (0 to +10V, +5V) 10K (+ 10V) 100 Megohms 125 nA typical, 250 nA max. +15V 2V min. to 5.5V max. positive pulse with duration of 100 nsec. min. Rise and fall times <30 nsec. Logic 1 to 0 transition resets converter and initiates next conversion. Loading: 2 TTL loads . Oto +70C or 55 to +125C 65C to + 150C Operating Temperature Range .. Storage Temperature Range ..... Package Size ................-. 1.700 x 1.100 x 0.160 inches Package Type................. 32 pin ceramic Pins 0.0.2. ees 0.010 x 0.018 inch Kovar Weight............-2-: cree 0.5 ounces (14 grams) FOOTNOTES: 1. All digital outputs can drive 2 TTL loads. 2. Without buffer amplifier used. ADC-HZ12B may require external adjustment of clock rate. . FSR is full scale range and is 10V for 0 to +10V or +5V input and 20V for + 10V input. . Short cycled operation. o a OUTPUTS! Parallel Output Data............ Coding, unipolar............... Coding, bipolar................ Serial Output Data ............. End of Conversion (Status) ...... 12 parailei lines of data held until next conversion command. Vour (0") <= +0.4V our (17) = +2.4V Complementary Binary Complementary Offset Binary Complementary Two's Complement NRZ successive decision pulses out, MSB first. Compl. Binary or Compl. Offset Binary Coding Conversion status signal. Output is logic '1 during reset and conversion and logic 0 when conversion complete. Clock Output ..............00. Train of positive going +5V 100 nsec. pulses. 600 kHz for ADC- HX12B and 1.5 MHz for ADC- HZ12B (pin 17 grounded). PERFORMANCE Resolution ............0. ue 12 bits (1 part in 4096) Nonlinearity ................0. +14 LSB max. Differential Nonlinearity ......... + % LSB max. Gain Error, before adjustment .... +0.1% Zero Error, unipolar, before adj. .. Offset Error, bipolar, before adj. . . Temp. Coeff. of Gain ........... Temp. Coeff. of Zero, unipolar ... Temp. Coeff. of Offset, bipolar ... Diff. Nonlinearity Tempco ....... No Missing Codes.............. Conversion Time?, 12 bits ....... 10 bits? ...... 8bitst ....... Buffer Settling Time, 10V step... . Power Supply Rejection......... +0.05% of FSR? +0.1% of FSR3 +20 ppm/C max. +5 ppm/C of FSR max.3 +10 ppm/C of FSR max.? +2 ppm/C of FSR3 Over oper. temp. range 20 psec. max. 8.0 usec. max. 15 usec. max. 6.0 nsec. max. 10 usec. max. 4.0 usec. max. 3.0 psec. to 0.01% 0.004%/% Supply max. POWER REQUIREMENTS Power Supply Voltage .......... +15V de +0.5V de at 20 mA 15V de +0.5V de at 25 mA + 5V dc +0.25V de at 85 mA 2-56 TECHNICAL NOTES 1. It is recommended that the +15V power input pins both be bypassed to ground with a 0.01 uF ceramic capacitor in parallel with a 1 uF electrolytic capacitor and the +5V power input pin be bypassed to ground with a 10 LF electrolytic capacitor as shown in the connection dia- grams. In addition, pin 27 should be bypassed to ground with a 0.01 uF ceramic capacitor. These precautions will assure noise free operation of the converter. 2. Digital Common (pin 15) and Analog Common (pin 26) are not connected together internally, and therefore must be connected as directly as possible externally. It is rec- ommended that a ground plane be run underneath the case between the two commons. Analog ground and +15V power ground should be run to pin 26 whereas dig- ital ground and +5V dc ground should be run to pin 15. 3. External adjustment of zero or offset and gain are provid- ed for by trimming potentiometers connected as shown in the connection diagrams. The potentiometer values can be between 10K and 100K ohms and should be 100 ppm/ C cermet types. The adjustment range is t0.2% of FSR for zero or offset and +0.3% for gain. The trim- ming pots should be located as close as possible to the converter to avoid noise pickup. In some cases, for ex- ample 8 bit short-cycled operation, external adjustment may not be necessary. 4. Short-cycled operation results in shorter conversion times where the conversion can be truncated to less than 12 bits. This is done by connecting pin 14 to the output bit following the last bit desired. For example, for an 8-bit conversion, pin 14 is connected to bit 9 output. Maximum conversion times are given for short-cycled conversions of 8 or 10 bits. In these two cases the clock rate is also speeded up by connecting the clock rate ad- just (pin 17) to +5V de (10 bits) or +15V de (8 bits). The clock rate should not be arbitrarily speeded up to exceed the maximum conversion rate at a given resolution, how- ever, or missing codes will result. DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1194/TEL (508) 339-3000/TLX 174388/FAX (508) 339-6356 ee TT5. Note that output coding is complementary coding. For unipolar operation it is complementary binary and for bipolar Operation it is complementary offset binary or complementary 2's complement. In cases where bipolar coding of offset binary or 2s complement is required, this can be achieved by inverting the analog input to the converter (using an op amp connected for gain of 1.0000). The converter is then calibrated so that FS analog input gives an output code of 0000 0000 0000, and +FS-1 LSB gives 1111 1111 1111. 6. These converters dissipate 1.7 watts maximum of power. The case to ambient thermal resistance is approximately 25C per watt. For ambient temperatures above 50C, care should be taken not to restrict air circulation in the vicinity of the converter. 7. These converters can be operated with an external clock. To accomplish this, a negative pulse train is applied to START CONVERT (Pin 21). The rate of the external clock must be lower than the rate of the internal clock as adjusted (see clock rate adjustment diagram) for the converter resolution selected. The pulse width of the external clock should be be- tween 100 nanoseconds and 300 nanoseconds. Each N-bit conversion cycle requires a pulse train of N + 1 clock pulses for completion, e.g., an 8-bit conversion requires 9 clock pulses for completion. A continuous pulse train may be used for consecutive conversions, resulting in an N-bit conversion every N + 1 pulses, or the E.0.C. output may be used to gate a continuous pulse train for single conversions. . When the input buffer amplifier is used, a delay equal to its settling time must be allowed between the input level change, such as a multiplexer channel change, and the negative- going edge of the START CONVERSION pulse. If the buffer is not required, its input (pin 30) should be tied to ANALOG GROUND (pin 26). This prevents the unused amplifier from introducing noise into the converter. For applications not us- ing the internal buffer, the converter must be driven from a source with an extremely low input impedance. TIMING DIAGRAM OPERATING PERIODS ADC-HX12B ADC-HZ12B T, 20 psec. T, 1.56 psec. START + e- 60 EOC : (STATUS) | 8.0 usec. 0.56 usec. eo e- 40 nsec CLOCK OuT CONVERT ~ 100 nsec MIN X, ADC- Easiest _ADC-H UE UR US 4 PIS CONNECTIONS AND CALIBRATION Input Connections INPUT WITHOUT BUFFER ~ WITH BUFFER VOLT. | INPUT] CONNECT THESE || INPUT CONNECT THESE RANGE | PIN | PINS TOGETHER || PIN | PINS TOGETHER _ Oto +5V 24 22 & 25 23 & 26 30 22 & 26 23 & 26 29 & 24 Oto +10V 24 - 23 & 26 30 = 23 & 26 29 & 24 t25v 24 22 & 25 23 & 22 30 122 & 25 23 & 22 29 & 24 +5V 24 = 23 & 22 30 | ~ 23 & 22 29 & 24 + 10V 25 = 23 & 22 30 1 23 & 22 29 & 25 CALIBRATION PROCEDURE 1. Connect the converter for bipolar or unipolar operation. Use the input connection table for the desired input voltage range and input impedance. Apply Start Convert pulses of 100 nanoseconds minimum duration to pin 21. The spacing of the pulses should be no less than the maximum conversion time. . Zero and Offset Adjustments Apply a precision voltage reference source between the selected analog input and ground. Adjust the output of the reference source to the value shown in the Calibration Table for the unipolar zero adjustment (zero +'% LSB) or the bipolar offset adjustment (FS+'% LSB). Adjust the trim- ming potentiometer so that the output code flickers equally between 1111 1111 1111 and 1111 1111 1110. . Full Scale Adjustment Change the output of the precision voltage reference source to the value shown in the Calibration Table for the unipolar or bipolar gain adjustment (+FS 11% LSB). Adjust the gain trimming potentiometer so that the output code flickers equally between 0000 0000 0001 and 0000 0000 0000. TIMING DIAGRAM FOR ADC-HX12B8, ADC-HZ12B OUTPUT: 101010101010 nsec ~1 |] PARALLEL -] DATA NOW | LYAUID Ty = ke 50 nsec 4 we 1 t 1 I ' I ; I I mime 40 nsec wei pe 40 nsec | i : | pea T r I Senat | 73 /| et 4 || BTS || Bit ait7 || gira if erg fair to! | avr int fl eit 12 DATA OUT : ar git2 | Bra (| eT 6 | ) Uh fsa) + + | + | whe - 40 nsec : I i i | | i I ' , ' 0 T rT v I t T T 1 mse | i (MSB) i -n4------ bp -4---b eb LL 4--4----- I I I |] Tota DTT Rea ea ott pode cba a2 : | : | | 1 | | 4 | i ! ; i 7 | Y T t ; | r ' ' I T 1 ; L 7 + + : ' ' t | BIT 3 : 1 . 1 | : : 1 Jr a T ? 1 y I v T \ ait 12 : (LSB) ' i ' | eet Poo tL i 1 For Immediate Assistance, Dial 1-800-233-2765 2-57ADC-HX, ADC-HZ Calibration Table Coding Table, Unipolar Operation UNIPOLAR RANGE ADJUST. INPUT VOLTAGE i come 1 3 ZERO . 06 mv INPUT RANGE BINARY CODING | to +5V GAIN +4 9982V 0 TO +10V 0TO +5 MsB isa! ZERO +12mv +9 9976V +4 9988V 0000 0000 0000 | Oto +10V GAIN +4 9963V + 8.7500 +4 3750 oor ttit ttt | BIPOLAR RANGE +7 5000 +3 7500 OOM tt11 7111 + 5.0000 + 25000 Owe vtii crit i +25V OFFSET -2 4994V +2 5000 +1 2500 VOID Atti ttt : = GAIN +2 4982V +1 2500 +0 6250 VMOt attra add 1 +0 0024 +0 0012 Vary atts 9110 25V GaN 74 963v 0.0000 0000 yg NN atts any tov OFFSET - 9 9976V + oe _ GAIN +9: 9927 Coding Table, Bipolar Operation COMP. COMP. TWO'S INPUT VOLTAGE RANGE OFFSET BINARY COMPLEMENT +10 1 +5V [ 2.50 MSB usa i _MSB iss +9 9951V ! +4 9976V T +2 4988V 0000 0000 0000 1000 0000 0000 > ? 5000 i + 37500 | + 18750 Ooot 1114 1104 1 1OO1 1119 U1 +5 0000 ! + 2.5000 1 +1 2500 OO sit 1nd YOR! iyad atid 0 0000 i 9 0000 | 0 GO00 Ove tit rit Viet 1tdd att +5 0000 ? 5000 1 2500 wat dy tit OOrt wid itty 5000 | 37500 : 1 8750 WOT qd tnt O11 ttt ttt 99951 i 49976 ? 4988 West tity tig Om wit wm1o0 1 19 0000 | 5 0000 ! 2 5000 Vitt attd att Ot tit att SHORT CYCLE OPERATION Peter to Technical Note 4 for methods of reducing the ADC-HX or ADC-HZ conversion times. CONNECTIONS 8, 10, & 12 BIT CONVERSION Ss RESOLUTION 12 BITS 10 BITS 8 BITS ADC-HX12B CONV. TIME] 20 usec 15 wsec 10 psec vay ADC-H2128 CONV. TIME] 8 psec 6 usec 4 usec CONNECT THESE 17 & 15 17& 16 17 & 28 Cree PINS TOGETHER 14 & 16 14& 2 14 & 4 notes re PIN 14 CONNECTION Dare SuTbT Fy CLOCK RATE VS, VOLTAGE RES. (BITS) PIN 14 TO AES. (SITS) PIN 1470 PIN 17 CLOCK RATE 2 PIN 10 8 PING VOLTAGE | ADC-HX12B | ADC-HZ12B8 3 PING 9 PIN3 ov 600 kHz 1.5MHz 4 PINS 10 PIN 2 +5V 720 kHz 1.BMHz 5 PIN? 11 PIN +15V 880 kHz 2.2MHz 6 PING 12 PIN 16 BIPOLAR OPERATION, 5V TO +5V UNIPOLAR OPERATION, 0 TO + 10V 7 ~ TART TART seven CONVERT IN CONVERT IN bw n fn + " ie AV Cre ie + 18V de + 15V a6 pors 200 o pied 1oK 19K pot! 20 TO =n. ST SF too || eyes ney vere 7 || Abo yey ADC Hx oO AOC-HX12B 24 7-0 8 ADC 47108 eho 15 GND 250 15 GND DATA ADC HZ12B8 OUTPUTS po: 260 $ 015 MEG 10K = aot $9, 8 MEG vox | tes on TO ar = TO feos 100K 100K toa ovo | dp iso + tp t: 100 f- tL wo |f = | ; ; 15M di =: pL te s eft te yr I _ _. ik I* O.0t .F CAPS ARE CERAMIC TYPES: Taf CAPS, 1 F CAPS: 0.01 .F CAPS ARE CERAMIC TYPES MODEL TEMP. RANGE SEAL ADC-HX12BGC 0 to +70 C Epoxy ADC-HX12BMC 0 to +70 C Hermetic ADC-HX12BMM ~ _-55to+125C = Hermetic ADC-HX/883B -55 to+125C ~~ Hermetic ADC-HZ12BGC 0 to +70 C Epoxy ADC-HZ12BMC 0 to +70 C Hermetic ADC-HZ12BMM ~ _-55 to +125C ~- Hermetic ADC-HZ/883B -55 to+125C Hermetic MIL-STD-883B units are available under DESC Drawing Number 5962-88508. 2-58 DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1194/TEL (508) 339-3000/TLX 174388/FAX (508) 339-6356