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AD7091R Conversion Result Change

After powering up the device why does the conversion result change after
approximately 60   samples have completed?


After power-up ensure that the software reset as outlined in the data sheet is
A software reset initializes the AD7091R and ensures correct conversion
results. The device will eventually initialize correctly after a certain number
of conversions without a software reset but it is recommended for correct
operation to always perform a software reset after a power cycle.