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The AD7124-4 is a low power, low noise, completely integrated analog front end for high precision measurement applications. The device contains a low noise...
AD7124-4 on Analog.com
AD7124-4B has two independent power supply pins: AVDD and IOVDD.
According to ABSOLUTE MAXIMUM RATINGS, there seems to be no order of the turning on/off the power.
Is it right?
The datasheet doesn't mention anything about it so there should be no issue about power sequence. It doesn't matter whether you power up AVDD or IOVDD first.