ADC-HX, ADC-HZ Series 12-Bit, 8 and 20μsec Analog-to-Digital Converters PRODUCT OVERVIEW The ADC-HX and ADC-HZ Series are selfcontained, 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. An internal buffer amplifier is also provided for applications in which 50 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 ±1/2LSB maximum. FEATURES S 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 BUFFER 30 INPUT 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 +70°C) or military (–55 to +125°C) operating temperature ranges. MIL-STD-883 and DESC Standard Military Drawing models are also available. INPUT/OUTPUT CONNECTIONS Pin Pin 2 BIT 11 31 –15V POWER 3 BIT 10 30 BUFFER INPUT 4 BIT 9 29 BUFFER OUTPUT 5 BIT 8 28 +15V POWER 6 BIT 7 27 GAIN ADJUST 7 BIT 6 26 ANALOG COMMON 8 BIT 5 25 20V INPUT RANGE 9 BIT 4 24 10V INPUT RANGE 10 BIT 3 23 BIPOLAR OFFSET 11 BIT 2 22 COMPARATOR INPUT 12 BIT 1 (MSB) 21 START CONVERT 13 BIT 1 (MSB) 20 E.O.C. (STATUS) 14 SHORT CYCLE 19 CLOCK OUT 15 DIGITAL COMMON 18 REFERENCE OUT 16 +5V POWER 17 CLOCK RATE –15V POWER REF. OUT +5V POWER 28 31 18 16 32 Function BIT 12 (LSB) +15V POWER + Function 1 SERIAL DATA OUTPUT BUFFER AMPLIFIER 6.3k8 GAIN 27 ADJUST PRECISION REF (+6.3V) BUFFER 29 OUTPUT BIPOLAR 23 OFFSET 15 12-BIT DAC COMPARATOR 22 INPUT COMPARATOR 5k8 10V 24 INPUT 14 SHORT CYCLE SUCCESSIVE APPROXIMATION REGISTER 5k8 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 7 8 9 10 11 12 12 11 LSB. 1 10 9 8 7 6 5 4 For full details go to www.murata-ps.com/rohs 3 BIT NO. 2 1 13 1 MSB MSB 32 SERIAL DATA OUT PARALLEL DATA OUT Figure 1. Functional Block Diagram www.murata-ps.com Technical enquiries email: [email protected], tel: +1 508 339 3000 MDA_ADCHXHZ.B01 Page 1 of 6 ADC-HX, ADC-HZ Series 12-Bit, 8 and 20μsec Analog-to-Digital Converters 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 Power Supply Voltages –15V ±0.5V at –25mA +5V ±0.25V at +85mA +15V ±0.5V at +20mA PHYSICAL/ENVIRONMENTAL Operating Temp. Range, Case Storage Temperature Range Package Type Weight Thermal Impedance QJC QJA Functional Specifications 0 to +70°C or –55 to +125°C –65 to +150°C 32-pin ceramic TDIP 0.5 ounces (14 grams) 6°C/W 30°C/W (Typical at +25°C and ±15V and +5V supplies unless otherwise noted) INPUTS Analog Input Ranges Unipolar Bipolar Input Impedance 5k (0 to +10V, ±5V) 10k (±10V) 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) 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. 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 12 bits ±1/2LSB max. ±3/4LSB max. 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 0.01μF ceramic capacitor in parallel with a 1μF electrolytic capacitor and the +5V power input pin be bypassed to ground with a 10μF electrolytic capacitor as shown in the connection diagrams. In addition, GAIN ADJUST (pin 27) should be bypassed to ground with a 0.01μF 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 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. 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 negative-going 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. ±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 20μs max. 15μs max. 10μs max. 3μs to ±0.01% ±0.004%/% supply max. 8μs max. 6μs max. 4μs max. OUTPUTS Parallel Output Data 12 parallel lines of data held until next conversion command. VOUT ("0") b +0.4V VOUT ("1") r +2.4V Unipolar Coding Complementary binary Bipolar Coding Complementary offset binary Complementary two’s complement Serial Output Data NRZ successive decision pulses out, MSB first. Compl. binary or compl. offset binary coding. End of Conversion (Status) Conversion status signal. Output is logic "1" during reset and conversion and logic "0" when conversion complete. Clock Output Train of positive going +5V 100ns pulses. 600kHz for ADC-HX and 1.5MHz for ADC-HZ (pin 17 grounded). Internal Reference +6.3V Reference Tempco ±20ppm/°C max. External Reference Current 2.5mA max. www.murata-ps.com Technical enquiries email: [email protected], tel: +1 508 339 3000 MDA_ADCHXHZ.B01 Page 2 of 6 ADC-HX, ADC-HZ Series 12-Bit, 8 and 20μsec Analog-to-Digital Converters CODING TABLES UNIPOLAR OPERATION INPUT RANGE BIPOLAR OPERATION COMP. BINARY CODING 0 TO +10V 0 TO +5V +9.9976V +4.9988V MSB LSB INPUT VOLTAGE RANGE COMP. OFFSET BINARY MSB COMP. TWO’S COMPLEMENT +10V +5V +2.5V 0000 0000 0000 +9.9951V +4.9976V + 2.4988V 0000 0000 0000 LSB MSB 1000 0000 0000 LSB +8.7500 +4.3750 0001 1111 1111 +7.5000 +3.7500 + 1.8750 0001 1111 1111 1001 1111 1111 + 7.5000 +3.7500 0011 1111 1111 +5.0000 +2.5000 + 1.2500 0011 1111 1111 1011 1111 1111 +5.0000 +2.5000 0111 1111 1111 0.0000 0.0000 0.0000 0111 1111 1111 1111 1111 1111 +2.5000 + 1.2500 1011 1111 1111 -5.0000 -2.5000 -1.2500 1011 1111 1111 0011 1111 1111 + 1.2500 +0.6250 1101 1111 1111 -7.5000 -3.7500 -1.8750 1101 1111 1111 0101 1111 1111 +0.0024 + 0.0012 1111 1111 1110 -9.9951 -4.9976 -2.4988 1111 1111 1110 0111 1111 1110 0.0000 0.0000 1111 1111 1111 -10.0000 -5.0000 -2.5000 1111 1111 1111 0111 1111 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 7 RESOLUTION 12 BITS 10 BITS 8 BITS $-0$, 3"5& 7 ADC-HX Conversion Time 20μs 15μs 10μs ADC-HZ Conversion Time 8μs 6μs 4μs 17 & 15 17 & 16 17 & 28 14 & 16 14 & 2 14 & 4 Connect These Pins Together 4)035 $:$-& 504&-&$5&% %"5"0651651*/ PIN 14 CONNECTION CLOCK RATE VS. VOLTAGE CLOCK RATE RES. (BITS) PIN 14 TO RES. (BITS) PIN 14 TO 1 PIN 11 7 PIN 5 2 PIN 10 8 PIN 4 PIN 17 VOLTAGE ADC-HX ADC-HZ 3 PIN 9 9 PIN 3 0V +5V +15V 600kHZ 720kHZ 880kHz 1.5MHZ 1.8MHz 2.2MHz 4 PIN 8 10 PIN 2 5 PIN 7 11 PIN 1 6 PIN 6 12 PIN 16 www.murata-ps.com Technical enquiries email: [email protected], tel: +1 508 339 3000 MDA_ADCHXHZ.B01 Page 3 of 6 ADC-HX, ADC-HZ Series 12-Bit, 8 and 20μsec Analog-to-Digital Converters START CONVERT IN +5V + 10μF +5V COMMON DATA OUTPUTS 16 15 14 13 12 11 10 9 8 17 18 19 20 21 22 23 24 25 "%$)9 03 "%$); 7 6 5 4 26 27 28 29 3 30 2 1 31 32 +15V ZERO ADJUST 2.2M8 0.01μF + 10k8 TO 100k8 2.8M8 0.01 μF GAIN ADJUST ANALOG INPUT (–5 TO +5V) 15V COMMON 10k8 TO 100k8 –15V 0.01 μF + 0.01μF CAPS ARE CERAMIC TYPES 1μF CAP Figure 2. Bipolar Operation, –5 to +5V START CONVERT IN +5V + 10μF +5V COMMON DATA OUTPUTS 16 15 14 13 12 11 10 9 8 "%$)9 03 "%$); 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 2.2M8 0.01μF + 2.8M8 0.01 μF + 10k8 TO 100k8 GAIN ADJUST ANALOG INPUT (0 TO +10V) 15V COMMON 10k8 TO 100k8 –15V 0.01 μF 0.01μF CAPS ARE CERAMIC TYPES 1μF 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 WITH BUFFER CONNECT THESE PINS TOGETHER 22 & 25 — 22& 25 — — 23 & 26 23 & 26 23 & 22 23 & 22 23 & 22 www.murata-ps.com 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 Technical enquiries email: [email protected], tel: +1 508 339 3000 MDA_ADCHXHZ.B01 Page 4 of 6 ADC-HX, ADC-HZ Series 12-Bit, 8 and 20μsec Analog-to-Digital Converters 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. 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. 3. 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 – 1.5LSB). Adjust the gain trimming potentiometer so that the output code flickers equally between 0000 0000 0001 and 0000 0000 0000. CALIBRATION TABLE UNIPOLAR RANGE ADJUST. INPUT VOLTAGE 0 to + 5V ZERO GAIN + 0.6 mV + 4.9982V 0 to + 10V ZERO GAIN + 1.2 mV + 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 RANGE TIMING DIAGRAM FOR ADC-HX, ADC-HZ OUTPUT: 101010101010 1 START CONVERT 100ns mi n. 0 60ns 1 E.O. C. (S TA TUS) 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 SERI AL DATA OU T BIT 1 (MSB) BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8 BIT 9 BIT 10 BIT 11 1 BIT 12 (LSB) 0 40ns 1 BIT 1 (M SB ) 0 1 BIT 2 0 1 BIT 3 0 1 BIT 12 (L SB ) 0 TIMING DIAGRAM OPERATING PERIODS ADC-HX www.murata-ps.com ADC-HZ T1 20μs 8μs T2 1.56μs 0.56μs Technical enquiries email: [email protected], tel: +1 508 339 3000 MDA_ADCHXHZ.B01 Page 5 of 6 ADC-HX, ADC-HZ Series 12-Bit, 8 and 20μsec Analog-to-Digital Converters 1.72 MAX. (43.69) 32 %JNFOTJPO5PMFSBODFT(unless otherwise indicated): 2 place decimal (.XX) ±0.010 (±0.254) 3 place decimal (.XXX) ±0.005 (±0.127) 17 -FBE.BUFSJBMKovar alloy 1.11 MAX. (28.19) 1 0.235 MAX. (5.969) -FBE'JOJTI50 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) 0.040 (1.016) 0.100 (2.540) MECHANICAL DIMENSIONS INCHES (mm) ORDERING GUIDE SUMMARY MODEL TEMP. RANGE ADC-HX12BGC ADC-HX12BMC ADC-HX12BMM ADC-HX12BMM-QL ADC-HX/883 0 to +70°C 0 to +70°C –55 to +125°C –55 to +125°C –55 to +125°C ADC-HZ12BGC ADC-HZ12BMC ADC-HZ12BMM ADC-HZ12BMM-QL ADC-HZ/883 0 to +70°C 0 to +70°C –55 to +125°C –55 to +125°C –55 to +125°C MIL-STD-883B units are available under DESC Drawing Number 5962-88508. Contact DATEL for 883 product specification. USA: Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 www.murata-ps.com email: [email protected] ISO 9001 and 14001 REGISTERED Toronto, Tel: (866) 740-1232, email: [email protected] UK: Milton Keynes, Tel: +44 (0)1908 615232, email: [email protected] France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: [email protected] Germany: München, Tel: +49 (0)89-544334-0, email: [email protected] Japan: Tokyo, Tel: 3-3779-1031, email: [email protected] Osaka, Tel: 6-6354-2025, email: [email protected] China: Shanghai, Tel: +86 215 027 3678, email: [email protected] Guangzhou, Tel: +86 208 221 8066, email: [email protected] Singapore: Parkway Centre, Tel: +65 6348 9096, email: [email protected] 01/28/09 Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. © 2008 Murata Power Solutions, Inc. www.murata-ps.com Mansfield (MA), Tel: (508) 339-3000, email: [email protected] Canada: Technical enquiries email: [email protected], tel: +1 508 339 3000 MDA_ADCHXHZ.B01 Page 6 of 6