Question
After powering up the device why does the conversion result change after
approximately 60 samples have completed?
Answer
After power-up ensure that the software reset as outlined in the data sheet is
completed. A software reset initializes the AD7091 and ensures correct
conversion results. The device will eventually initialize correctly after a
certain number of conversions without a software reset but it is recommend for
correct operation to always perform a software reset after a power cycle.