AD7730LBR datasheet(16/53 Pages) AD

16 / 53 page

AD7730/AD7730L

–16–

MD2

MD1

MD0

Operating Mode

Sync (Idle) Mode. In this mode, the modulator and filter are held in reset mode and the AD7730 is not

processing any new samples or data. Placing the part in this mode is equivalent to exerting the

SYNC

input pin. However, exerting the

SYNC pin does not actually force these mode bits to 0, 0, 0. The part

returns to this mode after a calibration or after a conversion in Single Conversion Mode. This is the

default condition of these bits after Power-On/Reset.

Continuous Conversion Mode. In this mode, the AD7730 is continuously processing data and providing

conversion results to the Data Register at the programmed output update rate (as determined by the

Filter Register). For most applications, this would be the normal operating mode of the AD7730.

Single Conversion Mode. In this mode, the AD7730 performs a single conversion, updates the Data

on the AD7730 in this mode will not be provided until the full settling time of the filter has elapsed.

Power-Down (Standby) Mode. In this mode, the AD7730 goes into its power-down or standby state.

Placing the part in this mode is equivalent to exerting the

STANDBY input pin. However, exerting

STANDBY does not actually force these mode bits to 0, 1, 1.

Zero-Scale Self-Calibration Mode. This activates zero-scale self-calibration on the channel selected by

CH1 and CH0 of the Mode Register. This zero-scale self-calibration is performed at the selected gain on

internally shorted (zeroed) inputs. When this zero-scale self-calibration is complete, the part updates the

contents of the appropriate Offset Calibration Register and returns to Sync Mode with MD2, MD1 and

MD0 returning to 0, 0, 0. The

RDY output and bit go high when calibration is initiated and return low

when this zero-scale self-calibration is complete to indicate that the part is back in Sync Mode and ready

for further operations.

Full-Scale Self-Calibration Mode. This activates full-scale self-calibration on the channel selected by

CH1 and CH0 of the Mode Register. This full-scale self-calibration is performed at the selected gain on

an internally-generated full-scale signal. When this full-scale self-calibration is complete, the part updates

the contents of the appropriate Gain Calibration Register and Offset Calibration Register and returns to

Sync Mode with MD2, MD1 and MD0 returning to 0, 0, 0. The

RDY output and bit go high when

calibration is initiated and return low when this full-scale self-calibration is complete to indicate that the

part is back in Sync Mode and ready for further operations.

Zero-Scale System Calibration Mode. This activates zero scale system calibration on the channel selected

by CH1 and CH0 of the Mode Register. Calibration is performed at the selected gain on the input volt-

age provided at the analog input during this calibration sequence. This input voltage should remain

stable for the duration of the calibration. When this zero-scale system calibration is complete, the part

updates the contents of the appropriate Offset Calibration Register and returns to Sync Mode with MD2,

MD1 and MD0 returning to 0, 0, 0. The

RDY output and bit go high when calibration is initiated and

return low when this zero-scale calibration is complete to indicate that the part is back in Sync Mode and

ready for further operations.

Full-Scale System Calibration Mode. This activates full-scale system calibration on the selected input

channel. Calibration is performed at the selected gain on the input voltage provided at the analog input

during this calibration sequence. This input voltage should remain stable for the duration of the calibra-

tion. When this full-scale system calibration is complete, the part updates the contents of the appropriate

Gain Calibration Register and returns to Sync Mode with MD2, MD1 and MD0 returning to 0, 0, 0.

The

RDY output and bit go high when calibration is initiated and return low when this full-scale calibra-

tion is complete to indicate that the part is back in Sync Mode and ready for further operations.

REV. B

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