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
FEATURE
S
Figure 1. Functional Block Diagram
PRECISION
REF (+6.3V)
CLOCK
SUCCESSIVE
APPROXIMATION
REGISTER
12-BIT DAC
COMPARATOR
6.3k
5k
REF. OUT
18
+5V POWER
16
27 GAIN
ADJUST
15
14
20
30
BUFFER
INPUT
29
23
BIPOLAR
OFFSET
22
COMPARATOR
INPUT
24
25
26
32
SERIAL
DATA
OUT
13
1
MSB
12
1
MSB
11
2
10
3
9
4
8
5
7
6
6
7
5
8
4
9
3
10
2
11
1
12
LSB.
21 19
17
CLOCK
RATE
PARALLEL DATA OUT
BIT NO.
+
5k
BUFFER
OUTPUT
10V
INPUT
20V
INPUT
ANALOG
COMMON
BUFFER
AMPLIFIER
CLOCK
OUT
START
CONV.
DIGITAL
COMMON
SHORT
CYCLE
E.O.C.
STATUS
–15V POWER
31
+15V POWER
28
The ADC-HX and ADC-HZ Series are self-
contained, high-performance, 12-bit A/D convert-
ers manufactured with thick and thin-fi lm hybrid
technology. They use the successive approximation
conversion technique to achieve a 12-bit conver-
sion in 20 and 8 microseconds, respectively. Five
input voltage ranges are programmable by external
pin connection. An internal buffer amplifi er 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 mono-
lithic comparator, a monolithic 12-bit successive
approximation register, a clock and a monolithic
buffer amplifi er. Nonlinearity is specifi ed 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 amplifi er increases con-
version time by 3 microseconds, the settling time
of the amplifi er. Output coding is complementary
binary, complementary offset binary, or comple-
mentary 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 Stan-
dard Military Drawing models are also available.
PRODUCT OVERVIEW
INPUT/OUTPUT CONNECTIONS
Pin Function Pin Function
1 BIT 12 (LSB) 32 SERIAL DATA OUTPUT
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
ADC-HX, ADC-HZ Series
12-Bit, 8 and 20μsec Analog-to-Digital Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
ADC-HXHZ.B03 Page 1 of 6
ABSOLUTE MAXIMUM RATINGS
PARAMETERS LIMITS UNITS
+15V Supply, Pin 28 +18 Volts
–15V Supply, Pin 31 –18 Volts
+5V Supply, Pin 16 +7 Volts
Digital Inputs, Pins 14, 21 ±5.5 Volts
Analog Inputs, Pins 24, 25 ±25 Volts
Buffer Input, Pin 30 ±15 Volts
Lead Temperature (10 seconds) 300 °C
Functional Specifi cations
(Typical at +25°C and ±15V and +5V supplies unless otherwise noted)
INPUTS ADC-HX12B ADC-HZ12B
Analog Input Ranges
Unipolar 0 to +5V, 0 to +10V
Bipolar ±2.5V, ±5V, ±10V
Input Impedance 2.5k (0 to +5V, ±2.5V)
5k (0 to +10V, ±5V)
10k (±10V)
Input Impedance with Buffer 50 megohms
Input Bias Current of Buffer 125nA typical, 250nA max.
Start Conversion
+2V min. to +5.5V max. positive pulse with dur-
ation
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 12 bits
Nonlinearity ±1/2LSB max.
Differential Nonlinearity ±3/4LSB max.
Accuracy Error ➀
Gain (before adjustment) ±0.2%
Zero, Unipolar (before adj.) ±0.1% of FSR ➁
Offset, Bipolar (before adj.) ±0.2% of FSR ➁
Temperature Coeffi cient
Gain ±20ppm/°C max.
Zero, Unipolar ±5ppm/°C of FSR max. ➁
Offset, Bipolar ±10ppm/°C of FSR max. ➁
Diff. Nonlinearity Tempco ±2ppm/°C of FSR max. ➁
No Missing Codes Over opererating temperature range
Conversion Time ➂
12 Bits 20μs max. 8μs max.
10 Bits ➃ 15μs max. 6μs max.
8 Bits ➃ 10μs max. 4μs max.
Buffer Settling Time (10V step) 3μs to ±0.01%
Power Supply Rejection ±0.004%/% supply max.
OUTPUTS ➄
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 fi rst.
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.
POWER REQUIREMENTS
Power Supply Voltages +15V ±0.5V at +20mA
–15V ±0.5V at –25mA
+5V ±0.25V at +85mA
PHYSICAL/ENVIRONMENTAL
Operating Temp. Range, Case 0 to +70°C or –55 to +125°C
Storage Temperature Range –65 to +150°C
Package Type 32-pin ceramic TDIP
Weight 0.5 ounces (14 grams)
Thermal Impedance
θJC 6°C/W
θJA 30°C/W
Footnotes:
➀ Adjustable to zero.
➁ FSR is full scale range and is 10V for 0 to +10V or ±5V inputs and 20V for
±10V input, etc.
➂ Without buffer amplifi er used. ADC-HZ may require external adjustment
of clock rate.
➃ Short cycled operation.
➄ 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 con-
verter 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 amplifi er 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 amplifi er 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.
ADC-HX, ADC-HZ Series
12-Bit, 8 and 20μsec Analog-to-Digital Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
ADC-HXHZ.B03 Page 2 of 6
SHORT CYCLE OPERATION
Refer to Technical Note 4 for methods of reducing the ADC-HX or ADC-HZ conversion times.
CONNECTIONS
16
15
14
17
SHORT
CYCLE
CLOCK
RATE
+5V
+15
V
TO SELECTED
DATA OUTPUT PIN
CODING TABLES
UNIPOLAR OPERATION BIPOLAR OPERATION
INPUT RANGE COMP. BINARY CODING INPUT VOLTAGE RANGE COMP. OFFSET BINARY COMP. TWO’S COMPLEMENT
0 TO +10V 0 TO +5V MSB LSB +10V +5V +2.5V MSB LSB MSB LSB
+9.9976V +4.9988V 0000 0000 0000 +9.9951V +4.9976V + 2.4988V 0000 0000 0000 1000 0000 0000
+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
PIN 14 CONNECTION
RES. (BITS) PIN 14 TO RES. (BITS) PIN 14 TO
1 PIN 11 7 PIN 5
2 PIN 10 8 PIN 4
3 PIN 9 9 PIN 3
4 PIN 8
10 PIN 2
5 PIN 7 11 PIN 1
6 PIN 6 12 PIN 16
CLOCK RATE VS. VOLTAGE
PIN 17
VOLTAGE
CLOCK RATE
ADC-HX ADC-HZ
0V 600kHZ 1.5MHZ
+5V 720kHZ 1.8MHz
+15V 880kHz 2.2MHz
8, 10 & 12-BIT CONVERSION TIMES
RESOLUTION 12 BITS 10 BITS 8 BITS
ADC-HX Conversion Time 20μs 15μs 10μs
ADC-HZ Conversion Time 8μs 6μs 4μs
Connect These Pins Together 17 & 15 17 & 16 17 & 28
14 & 16 14 & 2 14 & 4
ADC-HX, ADC-HZ Series
12-Bit, 8 and 20μsec Analog-to-Digital Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
ADC-HXHZ.B03 Page 3 of 6
Figure 2. Unipolar Operation, 0 to +10V
Figure 3. Bipolar Operation, –5 to +5V
CONNECTIONS AND CALIBRATION
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
17
START
CONVERT IN
2.2M
+5V
–15V
+5V COMMON
0.01μF CAPS ARE CERAMIC TYPES
DATA
OUTPUTS
1μF
CAP
0.01
μF
10μF
0.01μF 2.8M
0.01
μF
15V
10k
TO
100kANALOG INPUT
(0 TO +10V)
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
10k
TO
100k
+15V
+
+
+
OFFSET
ADJUST
GAIN
ADJUST
ADC-HX
OR
ADC-HZ
COMMON
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
17
START
CONVERT IN
ADC-HX
OR
ADC-HZ
2.2M
+5V
–15V
+5V COMMON
0.01μF CAPS ARE CERAMIC TYPES
DATA
OUTPUTS
1μF
CAP
0.01
μF
10μF
0.01μF 2.8M
0.01
μF
15V
COMMON
10k
TO
100k
ANALOG INPUT
(–5 TO +5V)
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
10k
TO
100k
+15V
+
+
+
ZERO
ADJUST
GAIN
ADJUST
INPUT CONNECTIONS
WITHOUT BUFFER WITH BUFFER
INPUT VOLTAGE RANGE INPUT PIN CONNECT THESE PINS TOGETHER INPUT PIN CONNECT THESE PINS TOGETHER
0 to +5V 24 22 & 25 23 & 26 30 22 & 25 23 & 26 29 & 24
0 to +10V 24 — 23 & 26 30 — 23 & 26 29 & 24
±2.5V 24 22& 25 23 & 22 30 22 & 25 23 & 22 29 & 24
±5V 24 — 23 & 22 30 — 23 & 22 29 & 24
±10V 25 — 23 & 22 30 — 23 & 22 29 & 25
ADC-HX, ADC-HZ Series
12-Bit, 8 and 20μsec Analog-to-Digital Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
ADC-HXHZ.B03 Page 4 of 6
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 fl ickers 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 fl ickers equally between 0000 0000 0001 and
0000 0000 0000.
TIMING DIAGRAM FOR
ADC-HX, ADC-HZ OUTPUT: 101010101010
TIMING DIAGRAM OPERATING PERIODS
ADC-HX ADC-HZ
T1 20μs 8μs
T2 1.56μs 0.56μs
1 2 3 4 5 6 7 8 9 10 11 12 13
START
CONVERT
E.O.C.
(STATUS)
CLOCK
OUT
SERIAL
DATA OUT
BIT 1
(MSB)
BIT 2 BIT 4
BIT 12
(LSB)
T1
T2
100ns min.
60ns
40ns
100ns
40ns
40ns
BIT 1
(MSB)
BIT 3 BIT 5 BIT 6 BIT 7 BIT 8 BIT 9 BIT 10 BIT 11 BIT 12
(LSB)
50ns
PARALLEL DATA
NOW VALID
1
BIT 2
BIT 3
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
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
BIPOLAR RANGE
± 2.5V OFFSET
GAIN
-2.4994V
+ 2.4982V
± 5V OFFSET
GAIN
– 4.9988V
+ 4.9963V
± 10V OFFSET
GAIN
– 9.9976V
+ 9.9927V
ADC-HX, ADC-HZ Series
12-Bit, 8 and 20μsec Analog-to-Digital Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
ADC-HXHZ.B03 Page 5 of 6
MECHANICAL DIMENSIONS
INCHES (mm)
0.040
(1.016)
SEATING
PLANE
0.025
(0.635)
0.200 MAX.
(5.080)
0.235 MAX.
(5.969)
0.190 MAX.
(4.826) 0.900 ±0.010
(22.860)
1.11 MAX.
(28.19)
0.100 TYP.
(2.540)
1.72 MAX.
(43.69)
116
17
32
1.500
(38.100)
0.100
(2.540)
0.100
(2.540)
0.018 ±0.002
(0.457)
0.010 ±0.002
(0.254)
Dimension Tolerances
(unless otherwise indicated):
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
Lead Material:
Kovar alloy
Lead Finish:
50 microinches (minimum) gold plating
over 100 microinches (nominal) nickel plating
ORDERING GUIDE SUMMARY
MODEL TEMP. RANGE
ADC-HX12BGC 0 to +70°C
ADC-HX12BMC 0 to +70°C
ADC-HX12BMM –55 to +125°C
ADC-HX12BMM-QL –55 to +125°C
ADC-HX/883 –55 to +125°C
ADC-HZ12BGC 0 to +70°C
ADC-HZ12BMC 0 to +70°C
ADC-HZ12BMM –55 to +125°C
ADC-HZ12BMM-QL –55 to +125°C
ADC-HZ/883 –55 to +125°C
MIL-STD-883B units are available under DESC Drawing Number
5962-88508. Contact DATEL for 883 product specifi cation.
ADC-HX, ADC-HZ Series
12-Bit, 8 and 20μsec Analog-to-Digital Converters
. 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. Specifi cations are subject to change
without notice.
www.datel.com • e-mail: help@datel.com
®®
DATEL
11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA
ITAR and ISO 9001/14001 REGISTERED
ADC-HXHZ.B03 Page 6 of 6
