ADC-HX, ADC-HZ Series (R) (R) 12-Bit, 8 and 20sec Analog-to-Digital Converters INNOVATION and EXCELLENCE FEATURES * * * * * * 12-bit resolution 8 or 20 microsecond conversion times 5 input voltage ranges Internal high Z input buffer Short-cycle operation MIL-STD-883 models available GENERAL DESCRIPTION INPUT/OUTPUT CONNECTIONS The ADC-HX and ADC-HZ Series are self-contained, highperformance, 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. An internal buffer amplifier is also provided for applications in which 50 megohm input impedance is required. PIN FUNCTION PIN FUNCTION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 BIT 12 (LSB) BIT 11 BIT 10 BIT 9 BIT 8 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 (MSB) BIT 1 (MSB) SHORT CYCLE DIGITAL COMMON +5V POWER 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 SERIAL DATA OUTPUT -15V POWER BUFFER INPUT BUFFER OUTPUT +15V POWER GAIN ADJUST ANALOG COMMON 20V INPUT RANGE 10V INPUT RANGE BIPOLAR OFFSET COMPARATOR INPUT START CONVERT E.O.C. (STATUS) CLOCK OUT REFERENCE OUT CLOCK RATE 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 1/2LSB maximum. Both models have identical operation except for conversion speed. They can be short-cycled to give faster conversions 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 two's complement. Serial data is also brought out. The package is a 32-pin ceramic TDIP. Models are available for use in either commercial (0 to +70C) or military (-55 to +125C) operating temperature ranges. MIL-STD-883 and DESC Standard Military Drawing models are also available. +15V POWER -15V POWER REF. OUT +5V POWER 28 31 18 16 BUFFER 30 INPUT + BUFFER AMPLIFIER 6.3k GAIN 27 ADJUST PRECISION REF (+6.3V) BUFFER 29 OUTPUT BIPOLAR 23 OFFSET 15 12-BIT DAC COMPARATOR 22 INPUT COMPARATOR 5k 10V 24 INPUT 14 SHORT CYCLE SUCCESSIVE APPROXIMATION REGISTER 5k 20V 25 INPUT ANALOG 26 COMMON DIGITAL COMMON 20 E.O.C. STATUS CLOCK 17 CLOCK RATE 19 CLOCK OUT 21 START CONV. 2 3 4 5 6 12 11 LSB. 1 10 9 8 7 7 8 9 10 11 12 6 5 4 3 BIT NO. 2 1 13 1 MSB MSB 32 SERIAL DATA OUT PARALLEL DATA OUT Figure 1. Functional Block Diagram 2-1 DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1194 (U.S.A.) Tel: 508-339-3000 Fax: 508-339-6356 * For immediate assistance 800-233-2765 (R) (R) ADC-HX, ADC-HZ ABSOLUTE MAXIMUM RATINGS PARAMETERS +15V Supply, Pin 28 -15V Supply, Pin 31 +5V Supply, Pin 16 Digital Inputs, Pins 14, 21 Analog Inputs, Pins 24, 25 Buffer Input, Pin 30 Lead Temperature (10 seconds) POWER REQUIREMENTS LIMITS UNITS +18 -18 +7 5.5 25 15 300 Volts Volts Volts Volts Volts Volts C FUNCTIONAL SPECIFICATIONS (Typical at +25C and 15V and +5V supplies unless otherwise noted) INPUTS Analog Input Ranges Unipolar Bipolar Input Impedance Input Impedance with Buffer Input Bias Current of Buffer Start Conversion ADC-HX12B ADC-HZ12B 0 to +5V, 0 to +10V 2.5V, 5V, 10V 2.5k (0 to +5V, 2.5V) 5k (0 to +10V, 5V) 10k (10V) 50 megohms 125nA typical, 250nA max. +2V min. to +5.5V max. positive pulse with duration of 100ns min. Rise and fall times <30ns. Logic "1" to "0" transition resets converter and initiates next conversion. Loading: 2 TTL loads. 12 bits 1/2LSB max. 3/4LSB max. 0.2% 0.1% of FSR 0.2% of FSR 20ppm/C max. 5ppm/C of FSR max. 10ppm/C of FSR max. 2ppm/C of FSR max. Over opererating temperature range 20s max. 15s max. 10s max. 3s to 0.01% 0.004%/% supply max. 8s max. 6s max. 4s max. OUTPUTS Parallel Output Data Unipolar Coding Bipolar Coding Serial Output Data End of Conversion (Status) Clock Output Internal Reference Reference Tempco External Reference Current +15V 0.5V at +20mA -15V 0.5V at -25mA +5V 0.25V at +85mA PHYSICAL/ENVIRONMENTAL Operating Temp. Range, Case Storage Temperature Range Package Type Weight Thermal Impedance JC JA 0 to +70C or -55 to +125C -65 to +150C 32-pin ceramic TDIP 0.5 ounces (14 grams) 6C/W 30C/W Footnotes: Adjustable to zero. FSR is full scale range and is 10V for 0 to +10V or 5V inputs and 20V for 10V input, etc. Without buffer amplifier used. ADC-HZ may require external adjustment of clock rate. Short cycled operation. All digital outputs can drive 2 TTL loads. TECHNICAL NOTES 1. It is recommended that the 15V power input pins both be bypassed to ground with a 0.01F ceramic capacitor in parallel with a 1F electrolytic capacitor and the +5V power input pin be bypassed to ground with a 10F electrolytic capacitor as shown in the connection diagrams. In addition, GAIN ADJUST (pin 27) should be bypassed to ground with a 0.01F ceramic capacitor. These precautions will assure noise free operation of the converter. PERFORMANCE Resolution Nonlinearity Differential Nonlinearity Accuracy Error Gain (before adjustment) Zero, Unipolar (before adj.) Offset, Bipolar (before adj.) Temperature Coefficient Gain Zero, Unipolar Offset, Bipolar Diff. Nonlinearity Tempco No Missing Codes Conversion Time 12 Bits 10 Bits 8 Bits Buffer Settling Time (10V step) Power Supply Rejection Power Supply Voltages 12 parallel lines of data held until next conversion command. VOUT ("0") +0.4V VOUT ("1") +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. Train of positive going +5V 100ns pulses. 600kHz for ADC-HX and 1.5MHz for ADC-HZ (pin 17 grounded). +6.3V 20ppm/C max. 2.5mA max. 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 recommended 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 digital ground and +5V ground should be run to pin 15. 3. External adjustment of zero or offset and gain are made by using trimming potentiometers connected as shown in the connection diagrams. The potentiometer values can be between 10k and 100k Ohms and should be 100ppm/C cermet types. The trimming pots should be located as close as possible to the converter to avoid noise pickup. In some cases, for example 8-bit short-cycled operation, external adjustment may not be necessary. 4. Short-cycled operation results in shorter conversion times when the conversion is truncated to less than 12 bits. This is done by connecting SHORT CYCLE (pin 14) to the output bit following the last bit desired. For example, for an 8-bit conversion, pin 14 is connected to the 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 accelerated by connecting the CLOCK RATE adjust (pin 17) to +5V (10 bits) or +15V (8 bits). The clock rate should not be arbitrarily speeded up to exceed the maximum conversion rate at a given resolution, as missing codes will result. DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1194 (U.S.A.) Tel: 508-339-3000 Fax: 508-339-6356 * For immediate assistance 800-233-2765 (R) (R) ADC-HX, ADC-HZ 5. 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 two's complement. In cases in which bipolar coding of offset binary or two's complement is required, this can be achieved by inverting the analog input to the converter (using an op amp connected for gain of -1). The converter is then calibrated so that -FS analog input gives an output code of 0000 0000 0000, and +FS - 1LSB gives 1111 1111 1111. 6. 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 Short Cycle Operation tables) for the converter resolution selected. The pulse width of the external clock should be between 100 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.O.C. output may be used to gate a continuous pulse train for single conversions. 7. 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 negativegoing edge of the START CONVERT pulse. If the buffer is not required, BUFFER INPUT (pin 30) should be tied to ANALOG COMMON (pin 26). This prevents the unused amplifier from introducing noise into the converter. For applications not using the buffer, the converter must be driven from a source with an extremely low output impedance. CODING TABLE BIPOLAR OPERATION CODING TABLE UNIPOLAR OPERATION COMP. BINARY CODING INPUT RANGE 0 to +10V 0 to +5V MSB +9.9976V +8.7500 +7.5000 +5.0000 +2.5000 +1.2500 +0.0024 0.0000 +4.9988V +4.3750 +3.7500 +2.5000 +1.2500 +0.6250 +0.0012 0.0000 0000 0001 0011 0111 1011 1101 1111 1111 0000 1111 1111 1111 1111 1111 1111 1111 COMP. OFFSET BINARY INPUT VOLTAGE RANGE LSB 10V 5V 2.5V MSB 0000 1111 1111 1111 1111 1111 1110 1111 +9.9951V +7.5000 +5.0000 0.0000 -5.0000 -7.5000 -9.9951 -10.0000 +4.9976V +3.7500 +2.5000 0.0000 -2.5000 -3.7500 -4.9976 -5.0000 +2.4988V +1.8750 +1.2500 0.0000 -1.2500 -1.8750 -2.4988 -2.5000 0000 0001 0011 0111 1011 1101 1111 1111 0000 1111 1111 1111 1111 1111 1111 1111 COMP. TWO'S COMPLEMENT LSB MSB 0000 1111 1111 1111 1111 1111 1110 1111 1000 1001 1011 1111 0011 0101 0111 0111 LSB 0000 1111 1111 1111 1111 1111 1111 1111 0000 1111 1111 1111 1111 1111 1110 1111 SHORT CYCLE OPERATION Refer to Technical Note 4 for methods of reducing the ADC-HX or ADC-HZ conversion times. CONNECTIONS 8, 10 & 12-BIT CONVERSION TIMES RESOLUTION 12 BITS 10 BITS 8 BITS ADC-HX Conversion Time ADC-HZ Conversion Time Connect These Pins Together 20s 8s 17 & 15 14 & 16 15s 6s 17 & 16 14 & 2 10s 4s 17 & 28 14 & 4 PIN 14 CONNECTION CLOCK RATE VS. VOLTAGE PIN 17 CLOCK RATE VOLTAGE ADC-HX ADC-HZ 0V +5V +15V 600kHZ 720kHZ 880kHz 1.5MHZ 1.8MHz 2.2MHz RES. (BITS) 1 2 3 4 5 6 PIN 14 TO RES. (BITS) PIN 14 TO PIN 11 PIN 10 PIN 9 PIN 8 PIN 7 PIN 6 7 8 9 10 11 12 PIN 5 PIN 4 PIN 3 PIN 2 PIN 1 PIN 16 Analog-to-Digital Converters (R) ADC-HX, ADC-HZ START CONVERT IN +5V 16 15 14 13 12 11 10 9 8 + 10F +5V COMMON DATA OUTPUTS ADC-HX OR ADC-HZ 17 18 19 20 21 22 23 24 25 7 6 5 4 26 27 28 29 3 30 2 1 31 32 +15V ZERO ADJUST 2.2M 0.01F + 10k TO 100k 2.8M GAIN ADJUST 0.01 F ANALOG INPUT (-5 TO +5V) 15V COMMON 10k TO 100k -15V 0.01 F + 0.01F CAPS ARE CERAMIC TYPES 1F CAP Figure 2. Bipolar Operation, -5 to +5V START CONVERT IN +5V 16 15 14 13 12 11 10 9 8 + 10F +5V COMMON DATA OUTPUTS ADC-HX OR ADC-HZ 17 18 19 20 21 22 23 24 25 7 6 5 4 26 27 28 29 3 30 2 1 31 32 +15V OFFSET ADJUST 2.2M 0.01F + 10k TO 100k 2.8M 0.01 F GAIN ADJUST ANALOG INPUT (0 TO +10V) 10k TO 100k -15V 0.01 F + 15V COMMON 0.01F CAPS ARE CERAMIC TYPES 1F CAP Figure 3. Unipolar Operation, 0 to +10V CONNECTIONS AND CALIBRATION INPUT CONNECTIONS WITHOUT BUFFER INPUT VOLTAGE RANGE INPUT PIN 0 to +5V 0 to +10V 2.5V 5V 10V 24 24 24 24 25 CONNECT THESE PINS TOGETHER 22 & 25 -- 22& 25 -- -- 23 & 26 23 & 26 23 & 22 23 & 22 23 & 22 WITH BUFFER INPUT PIN 30 30 30 30 30 CONNECT THESE PINS TOGETHER 22 & 25 -- 22 & 25 -- -- 23 & 26 23 & 26 23 & 22 23 & 22 23 & 22 29 & 24 29 & 24 29 & 24 29 & 24 29 & 25 DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1194 (U.S.A.) Tel: 508-339-3000 Fax: 508-339-6356 * For immediate assistance 800-233-2765 (R) (R) (R) ADC-HX, ADC-HZ or bipolar gain adjustment (+FS - 1.5LSB). Adjust the gain trimming potentiometer so that the output code flickers equally between 0000 0000 0001 and 0000 0000 0000. 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. CALIBRATION TABLE 2. 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 + 1/2LSB) or the bipolar offset adjustment (-FS + 1/2LSB). Adjust the trimming potentiometer so that the output code flickers equally between 1111 1111 1111 and 1111 1111 1110. UNIPOLAR RANGE ADJUST. INPUT VOLTAGE 0 to +5V Zero Gain +0.6mV +4.9982V 0 to +10V Zero Gain +1.2mV +9.9963V 2.5V Offset Gain -2.4994V +2.4982V 5V Offset Gain -4.9988V +4.9963V 10V Offset Gain -9.9976V +9.9927V BIPOLAR 3. Full Scale Adjustment Change the output of the precision voltage reference source to the value shown in the Calibration Table for the unipolar TIMING DIAGRAM FOR ADC-HX, ADC-HZ OUTPUT: 101010101010 1 START CONVERT 100ns min. 0 60ns 1 E.O.C. (STATUS) PARALLEL DATA NOW VALID T1 40ns 50ns 100ns CLOCK OUT 1 2 4 3 T2 5 0 6 8 7 9 10 11 12 1 13 0 40ns SERIAL DATA OUT BIT 1 (MSB) BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8 BIT 9 BIT 10 BIT 11 BIT 12 (LSB) 1 0 40ns 1 BIT 1 (MSB) 0 1 BIT 2 0 1 BIT 3 0 1 BIT 12 (LSB) 0 TIMING DIAGRAM OPERATING PERIODS T1 T2 ADC-HX ADC-HZ 20s 1.56s 8s 0.56s Analog-to-Digital Converters (R) (R) ADC-HX, ADC-HZ MECHANICAL DIMENSIONS INCHES (mm) 1.72 MAX. (43.69) 32 Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) 0.010 (0.254) 3 place decimal (.XXX) 0.005 (0.127) 17 Lead Material: Kovar alloy 1.11 MAX. (28.19) 1 0.235 MAX. (5.969) Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating 16 0.100 TYP. (2.540) 1.500 (38.100) 0.200 MAX. (5.080) 0.010 0.002 (0.254) 0.190 MAX. (4.826) 0.018 0.002 (0.457) 0.100 (2.540) SEATING PLANE 0.025 (0.635) 0.900 0.010 (22.860) 0.100 (2.540) 0.040 (1.016) ORDERING INFORMATION MODEL TEMP. RANGE ADC-HX12BGC ADC-HX12BMC ADC-HX12BMM ADC-HX12BMM-QL ADC-HX/883 0 to +70C 0 to +70C -55 to +125C -55 to +125C -55 to +125C ADC-HZ12BGC ADC-HZ12BMC ADC-HZ12BMM ADC-HZ12BMM-QL ADC-HZ/883 0 to +70C 0 to +70C -55 to +125C -55 to +125C -55 to +125C MIL-STD-883B units are available under DESC Drawing Number 5962-88508. Contact DATEL for 883 product specification. DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1194 (U.S.A.) Tel: 508-339-3000 Fax: 508-339-6356 * For immediate assistance 800-233-2765