I am using the BIST of AD9781 for testing DAC interface but I am facing some issues in that.

Even if I am giving all 0s on the data lines of DAC then also the BIST when enabled picks up some random values and the result read is not 0.

Is there some difference in BIST depending upon 2's complement binary mode and unsigned binary mode ?

As for 2's complement it is showing random sum but when I change it to unsigned binary (reg - 0x02) then it shows 0 as result.



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