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ADS8694: ADS8694

Part Number: ADS8694

Tool/software:

I am putting ADS8694 in one of my design.

The input is bipolar from -2V to 2V. and i am using the internal reference 4.096V with input range setting 0.625 x 4.096= +/-2.54V.

out of 18 bit data output 16 bit are changes as per input changes. but the 2 bits remains unchanged as input varies.

I am not getting why these two bits remains unchanged.

Please suggest the solution.