AD7859_15 Datasheet, PDF (10/28 Pages) Analog Devices – 3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit Sampling ADCs

AD7859/AD7859L
Table IIIa. Channel Selection for AD7859/AD7859L
Differential Sampling (SGL/DIFF = 0)
AMODE CHSLT AIN(+)*AIN(–)* Bipolar or
210
Unipolar
0
0 0 0 AIN1 AIN2
Unipolar
0
0 0 1 AIN3 AIN4
Unipolar
0
0 1 0 AIN5 AIN6
Unipolar
0
0 1 1 AIN7 AIN8
Unipolar
0
1xxx
x
Not Used
1
0 0 0 AIN1 AIN2
Bipolar
1
0 0 1 AIN3 AIN4
Bipolar
1
0 1 0 AIN5 AIN6
Bipolar
1
0 1 1 AIN7 AIN8
Bipolar
1
1xxx
x
Not Used
*AIN(+) refers to the positive input seen by the AD7859/AD7859L sample-and-
hold circuitry.
AIN(–) refers to the negative input seen by the AD7859/AD7859L sample-and-
hold circuitry.
Table IIIb. Channel Selection for AD7859/AD7859L
Single-Ended Sampling (SGL/DIFF = 1)
AMODE CHSLT AIN(+)*AIN(–)* Bipolar or
210
Unipolar
0
0 0 0 AIN1 AGND Unipolar
0
0 0 1 AIN3 AGND Unipolar
0
0 1 0 AIN5 AGND Unipolar
0
0 1 1 AIN7 AGND Unipolar
0
1 0 0 AIN2 AGND Unipolar
0
1 0 1 AIN4 AGND Unipolar
0
1 1 0 AIN6 AGND Unipolar
0
1 1 1 AIN8 AGND Unipolar
1
0 0 0 AIN1 AIN8
Unipolar
1
0 0 1 AIN3 AIN8
Unipolar
1
0 1 0 AIN5 AIN8
Unipolar
1
0 1 1 AIN7 AIN8
Unipolar
1
1 0 0 AIN2 AIN8
Unipolar
1
1 0 1 AIN4 AIN8
Unipolar
1
1 1 0 AIN6 AIN8
Unipolar
1
1 1 1 AIN8 AIN8
Unipolar
Table IV. Calibration Selection
CALMD CALSLT1 CALSLT0 Calibration Type
0
0
0
A full internal calibration is initiated. First the internal DAC is calibrated, then the
internal gain error and finally the internal offset error are removed. This is the default setting.
0
0
1
First the internal gain error is removed, then the internal offset error is removed.
0
1
0
The internal offset error only is calibrated out.
0
1
1
The internal gain error only is calibrated out.
1
0
0
A full system calibration is initiated. First the internal DAC is calibrated, followed by the
system gain error calibration, and finally the system offset error calibration.
1
0
1
First the system gain error is calibrated out, followed by the system offset error.
1
1
0
The system offset error only is removed.
1
1
1
The system gain error only is removed.
–10–
REV. A