AD7708 big defference offset value between system and internal calibration.

Discussion created by sofy Employee on Jul 28, 2016
Latest reply on Aug 4, 2016 by Ren


When do zero calibration result compare between system and internal calibration, there is a big difference.

After Internal calibrattion, offset register value nothing to change from 0x8000.

But when do system calibration with AIN 0V, offset register value about 0x5500.


Is this big difference could be happen usually?

I suppose external 0V input is not exalcly 0V. But even though, this difference seems too big.


Thank you for your help In advance.

Best Regards,