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AD7655 9mv output exist when tie to the GND

Question asked by Verti on May 21, 2017
Latest reply on May 23, 2017 by Verti

Dear Specialists,

         We connect AD7655 INA1(Pin46) and INB1(Pin 39) to GND, first sample INA1 and then sample INB1, we find 9mV output with INB1, if  exchange the order(first INB1, then INA1), we find 9mv output with INA1.

        We have tried several chips and always find such phenomenon. Does it's  normal caused by ADC's DC error?