adc-hz-883 C&D Technologies., adc-hz-883 Datasheet - Page 5

• Manufacturer Part Number: adc-hz-883
• Description: 12-bit, 8 And 20?sec Analog-to-digital Converters
• Manufacturer: C&D Technologies.

CALIBRATION PROCEDURE
1. Connect the converter for bipolar or unipolar operation.
2. Zero and Offset Adjustments
3. Full Scale Adjustment
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.
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.
Change the output of the precision voltage reference source
to the value shown in the Calibration Table for the unipolar
®
DATA OUT
CONVERT
(STATUS)
SERIAL
CLOCK
START
E.O.C.
BIT 12
(MSB)
(LSB)
BIT 1
BIT 2
BIT 3
OUT
®
40ns
1
ADC-HX, ADC-HZ OUTPUT: 101010101010
100ns min.
40ns
(MSB)
2
BIT 1
60ns
3
BIT 2
TIMING DIAGRAM FOR
40ns
4
BIT 3
T2
5
100ns
BIT 4
6
BIT 5
T1
7
BIT 6
UNIPOLAR
BIPOLAR
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.
8
BIT 7
9
BIT 8
T
T
1
2
10
OPERATING PERIODS
BIT 9 BIT 10 BIT 11
TIMING DIAGRAM
ADC-HX
0 to +10V
11
RANGE
0 to +5V
1.56µs
CALIBRATION TABLE
20µs
±2.5V
±10V
±5V
12
13
ADC-HX, ADC-HZ
PARALLEL DATA
NOW VALID
ADJUST.
ADC-HZ
BIT 12
(LSB)
0.56µs
Offset
Offset
Offset
Gain
Zero
Gain
Gain
Gain
Gain
Zero
8µs
50ns
Analog-to-Digital Converters
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
INPUT VOLTAGE
+4.9982V
+9.9963V
–2.4994V
+2.4982V
–4.9988V
+4.9963V
–9.9976V
+9.9927V
+0.6mV
+1.2mV