AD7858/AD7858L
Table III. Channel Selection
SGL/DIFF
CH2
CH1
CH0
AIN(+)*
AIN(–)*
0
0
0
0
0
0
0
0
0
0
1
1
0
1
0
1
AIN1
AIN3
AIN5
AIN7
AIN2
AIN4
AIN6
AIN8
0
0
0
0
1
1
1
1
0
0
1
1
0
1
0
1
AIN2
AIN4
AIN6
AIN8
AIN1
AIN3
AIN5
AIN7
1
1
1
1
0
0
0
0
0
0
1
1
0
1
0
1
AIN1
AIN3
AIN5
AIN7
AGND
AGND
AGND
AGND
1
1
1
1
1
1
1
1
0
0
1
1
0
1
0
1
AIN2
AIN4
AIN6
AIN8
AGND
AGND
AGND
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
0
0
0
A 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
0
1
1
1
0
0
1
0
This calibrates out the Internal Offset Error only.
This calibrates out the Internal Gain Error only.
A 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
1
1
0
1
This calibrates out the System Offset Error only.
This calibrates out the System Gain Error only.
REV. B
–11–
ADI [ ADI ]
