I'm trying to read the output of the ADC & using variable power supply. The ADC output shows the multiple of 2 of applied input voltage.
For e.g if I'm giving 5V then ADC output shows 10V.
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This issue is mostly related to your digital timing, there is one bit was shifted. Can you please provide a timing captured with an analog oscilloscope for just one cycle including CONVST, SCLK,SDI and SDO? Also, please use a precision DC signal generator as an analog input signal to the ADC.