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ADC-HX, ADC-HZ Series
12-Bit, 8 and 20sec 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. 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. INPUT/OUTPUT CONNECTIONS
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
+15V POWER 28 -15V POWER 31 BUFFER AMPLIFIER 6.3k PRECISION REF (+6.3V) GAIN 27 ADJUST REF. OUT 18 +5V POWER 16
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
Function 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
Pin 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
Function 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
BUFFER 30 INPUT
+
BUFFER 29 OUTPUT BIPOLAR 23 OFFSET COMPARATOR 22 INPUT 5k 10V 24 INPUT 5k 20V 25 INPUT ANALOG 26 COMMON CLOCK SUCCESSIVE APPROXIMATION REGISTER COMPARATOR 14 SHORT CYCLE 20 E.O.C. STATUS 12-BIT DAC 15
DIGITAL COMMON
17 CLOCK RATE
19 CLOCK OUT
21 START CONV.
1
2
3
10
4
9
5
8
6
7
7
6
8
5
9 10 11 12
4 3 2
13
1
12 11 LSB.
1
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BIT NO.
MSB MSB
32 SERIAL DATA OUT
PARALLEL DATA OUT
Figure 1. Functional Block Diagram
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MDA_ADCHXHZ.B01 Page 1 of 6
ADC-HX, ADC-HZ Series
12-Bit, 8 and 20sec 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 UNITS
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
LIMITS
+18 -18 +7 5.5 25 15 300
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
Functional Specifications
(Typical at +25C 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
0 to +5V, 0 to +10V 2.5V, 5V, 10V 2.5k (0 to +5V, 2.5V)
ADC-HZ12B
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.
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.
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. 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. 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. 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. 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. 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. 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.
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. 0.2% 0.1% of FSR 0.2% of FSR
2.
3.
4.
20ppm/C max. 5ppm/C of FSR max. 10ppm/C of FSR max. 2ppm/C of FSR max. Over opererating temperature range
5.
20s max. 15s max. 10s max. 3s to 0.01% 0.004%/% supply max.
8s max. 6s max. 4s max.
6.
OUTPUTS
Parallel Output Data 12 parallel lines of data held until next conversion command. VOUT ("0") +0.4V VOUT ("1") +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.
7.
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MDA_ADCHXHZ.B01 Page 2 of 6
ADC-HX, ADC-HZ Series
12-Bit, 8 and 20sec Analog-to-Digital Converters
CODING TABLES
UNIPOLAR OPERATION INPUT RANGE 0 TO +10V +9.9976V +8.7500 + 7.5000 +5.0000 +2.5000 + 1.2500 +0.0024 0.0000 0 TO +5V +4.9988V +4.3750 +3.7500 +2.5000 + 1.2500 +0.6250 + 0.0012 0.0000 COMP. BINARY CODING MSB LSB +10V +9.9951V +7.5000 +5.0000 0.0000 -5.0000 -7.5000 -9.9951 -10.0000 INPUT VOLTAGE RANGE +5V +4.9976V +3.7500 +2.5000 0.0000 -2.5000 -3.7500 -4.9976 -5.0000 +2.5V + 2.4988V + 1.8750 + 1.2500 0.0000 -1.2500 -1.8750 -2.4988 -2.5000 BIPOLAR OPERATION COMP. OFFSET BINARY MSB LSB COMP. TWO'S COMPLEMENT MSB LSB
0000 0000 0000 0001 1111 1111 0011 1111 1111 0111 1111 1111 1011 1111 1111 1101 1111 1111 1111 1111 1110 1111 1111 1111
0000 0000 0000 0001 1111 1111 0011 1111 1111 0111 1111 1111 1011 1111 1111 1101 1111 1111 1111 1111 1110 1111 1111 1111
1000 0000 0000 1001 1111 1111 1011 1111 1111 1111 1111 1111 0011 1111 1111 0101 1111 1111 0111 1111 1110 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
RESOLUTION ADC-HX Conversion Time ADC-HZ Conversion Time Connect These Pins Together 12 BITS 20s 8s 17 & 15 14 & 16 10 BITS 15s 6s 17 & 16 14 & 2 8 BITS 10s 4s 17 & 28 14 & 4
PIN 14 CONNECTION
RES. (BITS) PIN 14 TO PIN 11 PIN 10 PIN 9 PIN 8 PIN 7 PIN 6 RES. (BITS) 7 8 9 10 11 12 PIN 14 TO PIN 5 PIN 4 PIN 3 PIN 2 PIN 1 PIN 16
CLOCK RATE VS. VOLTAGE
PIN 17 VOLTAGE CLOCK RATE ADC-HX ADC-HZ
1 2 3 4 5 6
0V +5V +15V
600kHZ 720kHZ 880kHz
1.5MHZ 1.8MHz 2.2MHz
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MDA_ADCHXHZ.B01 Page 3 of 6
ADC-HX, ADC-HZ Series
+5V + 10F 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 0.01 F 0.01F CAPS ARE CERAMIC TYPES -15V START CONVERT IN
12-Bit, 8 and 20sec Analog-to-Digital Converters
+15V ZERO ADJUST 10k TO 100k
+5V COMMON
2.2M
ANALOG INPUT (-5 TO +5V) 15V COMMON
DATA OUTPUTS
0.01F +
2.8M GAIN ADJUST
0.01 F
10k TO 100k
+ 1F CAP
Figure 2. Bipolar Operation, -5 to +5V
+5V + 10F 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 1F CAP
START CONVERT IN
+15V OFFSET ADJUST 2.2M 10k TO 100k
+5V COMMON
ANALOG INPUT (0 TO +10V) 15V COMMON
DATA OUTPUTS
0.01F +
2.8M GAIN ADJUST
0.01 F 0.01 F
10k TO 100k
-15V
+
0.01F CAPS ARE CERAMIC TYPES
Figure 3. Unipolar Operation, 0 to +10V
CONNECTIONS AND CALIBRATION
INPUT CONNECTIONS
WITHOUT BUFFER INPUT VOLTAGE RANGE INPUT PIN CONNECT THESE PINS TOGETHER INPUT PIN WITH BUFFER CONNECT THESE PINS TOGETHER
0 to +5V 0 to +10V 2.5V 5V 10V
24 24 24 24 25
22 & 25 -- 22& 25 -- --
23 & 26 23 & 26 23 & 22 23 & 22 23 & 22
30 30 30 30 30
22 & 25 -- 22 & 25 -- --
23 & 26 23 & 26 23 & 22 23 & 22 23 & 22
29 & 24 29 & 24 29 & 24 29 & 24 29 & 25
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MDA_ADCHXHZ.B01 Page 4 of 6
ADC-HX, ADC-HZ Series
12-Bit, 8 and 20sec 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 0 to + 5V 0 to + 10V BIPOLAR RANGE 2.5V 5V 10V OFFSET GAIN OFFSET GAIN OFFSET GAIN -2.4994V + 2.4982V - 4.9988V + 4.9963V - 9.9976V + 9.9927V ADJUST. ZERO GAIN ZERO GAIN INPUT VOLTAGE + 0.6 mV + 4.9982V + 1.2 mV + 9.9963V
TIMING DIAGRAM FOR ADC-HX, ADC-HZ OUTPUT: 101010101010
1 START CONVERT 100ns mi n. 0 60ns E.O. C. (S TA TUS) 40ns 100ns CLOCK OUT 40ns SERI AL DATA OU T BIT 1 (MSB) BIT 2 BIT 3 40ns 1 BIT 1 (M SB ) 0 1 BIT 2 0 1 BIT 3 0 BIT 12 (L SB ) 1 0 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8 BIT 9 BIT 10 BIT 11 BIT 12 (LSB) 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 1
T1
PARALLEL DATA NOW VALID
0
50ns 1 0
T2
TIMING DIAGRAM OPERATING PERIODS
ADC-HX T1 T2 20s 1.56s ADC-HZ 8s 0.56s
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MDA_ADCHXHZ.B01 Page 5 of 6
ADC-HX, ADC-HZ Series
12-Bit, 8 and 20sec Analog-to-Digital Converters
1.72 MAX. (43.69)
32
17
(unless otherwise indicated): 2 place decimal (.XX) 0.010 (0.254) 3 place decimal (.XXX) 0.005 (0.127) Kovar alloy
1.11 MAX. (28.19)
50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating
1
16
0.235 MAX. (5.969)
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) 0.040 (1.016)
SEATING PLANE 0.025 (0.635)
0.900 0.010 (22.860)
0.100 (2.540)
MECHANICAL DIMENSIONS INCHES (mm)
ORDERING GUIDE SUMMARY MODEL ADC-HX12BGC ADC-HX12BMC ADC-HX12BMM ADC-HX12BMM-QL ADC-HX/883 ADC-HZ12BGC ADC-HZ12BMC ADC-HZ12BMM ADC-HZ12BMM-QL ADC-HZ/883 TEMP. RANGE 0 to +70C 0 to +70C -55 to +125C -55 to +125C -55 to +125C 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.
USA: Canada: UK: France: Germany: Japan: China: Singapore:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Munchen, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
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
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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. (c) 2008 Murata Power Solutions, Inc.
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