Datasheet

AD7858/AD7858L
REV. B
–11–
Table III. Channel Selection
SGL/DIFF CH2 CH1 CH0 AIN(+)* AIN(–)*
0 0 0 0 AIN
1
AIN
2
0 0 0 1 AIN
3
AIN
4
0 0 1 0 AIN
5
AIN
6
0 0 1 1 AIN
7
AIN
8
0 1 0 0 AIN
2
AIN
1
0 1 0 1 AIN
4
AIN
3
0 1 1 0 AIN
6
AIN
5
0 1 1 1 AIN
8
AIN
7
1 0 0 0 AIN
1
AGND
1 0 0 1 AIN
3
AGND
1 0 1 0 AIN
5
AGND
1 0 1 1 AIN
7
AGND
1 1 0 0 AIN
2
AGND
1 1 0 1 AIN
4
AGND
1 1 1 0 AIN
6
AGND
1 1 1 1 AIN
8
AGND
*AIN(+) refers to the positive input seen by the AD7858/AD7858L sample and hold circuit,
*AIN(–) refers to the negative input seen by the AD7858/AD7858L sample and hold circuit.
Table IV. Calibration Selection
CALMD CALSLT1 CALSLT0 Calibration Type
000A Full Internal Calibration is initiated where the Internal DAC is calibrated
followed by the Internal Gain Error, and finally the Internal Offset Error is
calibrated out. This is the default setting.
0 0 1 Here the Internal Gain Error is calibrated out followed by the Internal Offset
Error calibrated out.
0 1 0 This calibrates out the Internal Offset Error only.
0 1 1 This calibrates out the Internal Gain Error only.
100A Full System Calibration is initiated here where first the Internal DAC is
calibrated followed by the System Gain Error, and finally the System Offset
Error is calibrated out.
1 0 1 Here the System Gain Error is calibrated out followed by the System Offset
Error.
1 1 0 This calibrates out the System Offset Error only.
1 1 1 This calibrates out the System Gain Error only.