EVAL-AD7856CB 查看數據表（PDF） - Analog Devices

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EVAL-AD7856CB

5 V Single Supply, 8-Channel 14-Bit 285 kSPS Sampling ADC

Analog Devices 

CALMD

0

0

0

0

1

1

1

1

AD7856

Table III. Channel Selection

SGL/DIFF

CH2

CH1

CH0

0

0

0

0

0

0

0

1

0

0

1

0

0

0

1

1

0

1

0

0

0

1

0

1

0

1

1

0

0

1

1

1

1

0

0

0

1

0

0

1

1

0

1

0

1

0

1

1

1

1

0

0

1

1

0

1

1

1

1

0

1

1

1

1

*AIN(+) refers to the positive input seen by the AD7856 sample and hold circuit.

AIN(–) refers to the negative input seen by the AD7856 sample and hold circuit.

AIN(+)*

AIN1

AIN3

AIN5

AIN7

AIN2

AIN4

AIN6

AIN8

AIN1

AIN3

AIN5

AIN7

AIN2

AIN4

AIN6

AIN8

AIN(–)*

AIN2

AIN4

AIN6

AIN8

AIN1

AIN3

AIN5

AIN7

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

CALSLT1

0

0

1

1

0

0

1

1

Table IV. Calibration Selection

CALSLT0

0

1

0

1

0

1

0

1

Calibration Type

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.

Here the Internal Gain Error is calibrated out followed by the Internal Offset

Error calibrated out.

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.

Here the System Gain Error is calibrated out followed by the System Offset

Error.

This calibrates out the System Offset Error only.

This calibrates out the System Gain Error only.

REV. A

–11–

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