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AD4003 negative output


I am using AD4003 ADC in one of the design. In this we are using 3-wire turbo mode.

Clock frequency used is 100Mhz.

Now when I provide 3V differential signal to the input of ADC. I am getting a hex value 0x2D0CD which is near to -3V(Read on SDO line).

My question is why I am getting output of ADC with sign reversal?



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