Lets say I need a measure voltage across a resistor, the voltage across it is ~0.1v, the voltage at each end of the resistor is 2.95v and 3.05v
Ideally I want to do a differential ADC and use the PGA. I would assume that I should be playing with the AOFF register to bias both DACs at around 3v, but I read the following in the datasheet
The analog offset of the AFE is configured in the AOFF field in the Channel Offset Compensation register
(AFEC_COCR). The offset is only available in Single-ended mode. The field AOFF must be configured to
512 (mid scale of the DAC) when there is no offset error to compensate.To compensate for an offset error
of n LSB (positive or negative), the field AOFF must be configured to 512 + n.
Which seems to indicate that it is not possible for me to do that.
Any help would be appreciated.