Datasheet

AD7193 Data Sheet

Rev. D | Page 26 of 56

MD2 MD1 MD0 Mode

1 0 0 Internal zero-scale calibration. An internal short is automatically connected to the input.

RDY

goes high when the

calibration is initiated and returns low when the calibration is complete. The ADC is placed in idle mode following a

calibration. The measured offset coefficient is placed in the offset register of the selected channel.

1 0 1 Internal full-scale calibration. A full-scale input voltage is automatically connected to the input for this calibration.

RDY

goes high when the calibration is initiated and returns low when the calibration is complete. The ADC is placed

in idle mode following a calibration. The measured full-scale coefficient is placed in the full-scale register of the

selected channel. A full-scale calibration is recommended each time that the gain of a channel is changed to

minimize the full-scale error. When AV

is less than 4.75 V, the CLK_DIV bit must be set when performing the

internal full-scale calibration.

1 1 0 System zero-scale calibration. The user should connect the system zero-scale input to the channel input pins as

selected by the CH7 to CH0 bits in the configuration register.

RDY

goes high when the calibration is initiated and

returns low when the calibration is complete. The ADC is placed in idle mode following a calibration. The measured

offset coefficient is placed in the offset register of the selected channel. A system zero-scale calibration is recommended

each time that the gain of a channel is changed.

1 1 1 System full-scale calibration. The user should connect the system full-scale input to the channel input pins as

selected by the CH7 to CH0 bits in the configuration register.

RDY

goes high when the calibration is initiated and

returns low when the calibration is complete. The ADC is placed in idle mode following a calibration. The measured

full-scale coefficient is placed in the full-scale register of the selected channel. A full-scale calibration is recommended

each time the gain of a channel is changed.