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ADS-951 Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers

Part No. ADS-951
Description  18-Bit, 1MHz, Low-Power Sampling A/D Converters
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Maker  ETC2 [List of Unclassifed Manufacturers]
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ADS-951 Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers

   
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ADS-951
4
®®
Zero/Offset Adjust Procedure
1. Apply a train of pulses to the START CONVERT input
(pin 16) so that the converter is continuously converting.
2. For bipolar zero/offset adjust, apply –19µV to the ANALOG
INPUT (pin 4).
3. Adjust the offset potentiometer until the output code flickers
equally between 01 1111 1111 1111 1111 and 10 0000
0000 0000 0000.
Gain Adjust Procedure
1. Apply –4.999943V to the ANALOG INPUT (pin 4).
2. Adjust the gain potentiometer until all output bits are 1's
and the LSB flickers between 1 and 0.
3. To confirm proper operation of the device, vary the applied
input voltage to obtain the output coding listed in Table 2.
BIPLOAR
INPUT VOLTAGE
SCALE
±5V
MSB
LSB
+FS –1 LSB
+4.999962
00 0000 0000 0000 0000
+3/4 FS
+3.750000
00 0111 1111 1111 1111
+1/2 FS
+2.500000
00 1111 1111 1111 1111
0
+0.000000
01 1111 1111 1111 1111
–1/2 FS
–2.500000
10 1111 1111 1111 1111
–3/4 FS
–3.750000
11 0111 1111 1111 1111
–FS +1 LSB
–4.999962
11 1111 1111 1111 1110
–FS
–5.000000
11 1111 1111 1111 1111
OUTPUT CODING
COMPLEMENTARY
OFFSET BINARY
Table 2. Output Coding
CALIBRATION PROCEDURE
Connect the converter per Table 1 for the appropriate input
voltage range. Any offset/gain calibration procedures should
not be implemented until the device is fully warmed up. To
avoid interaction, adjust offset before gain. The ranges of
adjustment for the circuits in Figure 2 are guaranteed to
compensate for the ADS-951's initial accuracy errors and may
not be able to compensate for additional system errors.
A/D converters are calibrated by positioning their digital outputs
exactly on the transition point between two adjacent digital
output codes. This is accomplished by connecting LED's to the
digital outputs and performing adjustments until certain LED's
"flicker" equally between on and off. Other approaches employ
digital comparators or microcontrollers to detect when the
outputs change from one code to the next.
For the ADS-951, offset adjusting is normally accomplished
when the analog input is 0 minus ½LSB (–19µV). See Table 2
for the proper bipolar output coding.
Gain adjusting is accomplished when the analog input is at
nominal full scale minus 1½LSB's (–4.999943V).
INPUT VOLTAGE
ZERO ADJUST
GAIN ADJUST
RANGE
(–½ LSB)
(–FS +1½ LSB)
±5V
–19µV
–4.999943
Table 1. Input Connections


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