AD7859/AD7859L

REV. A

–10–

Table IV. Calibration Selection

CALMD

CALSLT1

CALSLT0

Calibration Type

00

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.

10

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.

Table IIIa. Channel Selection for AD7859/AD7859L

Differential Sampling (SGL/DIFF = 0)

AMODE

CHSLT

AIN(+)*AIN(–)*

Bipolar or

2

1

0

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

1

x

x

x

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

1

x

x

x

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

2

1

0

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