The device powers up in standby mode and automatically enters this mode whenever there is no ongoing conversion. When the STOP command is sent (or the START/SYNC pin is taken low) in continuous conversion mode, or when a conversion completes in single-shot conversion mode, the device enters standby mode.
Standby mode offers several different options and features to lower the power consumption:
If powered down in standby mode, the PGA and internal reference can require extra time to power up. Extra delay may be required between power up of the PGA or the internal reference, and the start of conversions. In particular, the reference power up time is dependent on the capacitance between REFOUT and REFCOM.
Calibration commands are not decoded when the device is in standby mode.