Function of gain and offset calibration registers

Hi,

The offset register is applied internally to the ADC results.

Similarly, the gain calibration register is applied internally scale the ADC results and minimize full scale errors.

Typically, the gain and offset errors are minimal, so a 16-bit register should suffice in correcting these errors.

Thanks,

Karl

Thanks for your reply, Karl.

I'm essentially reverse engineering a design of a colleague who has moved on.  The issue is that the zero- and full-scale calibrations are being used to apply a gain and offset to a measurement.  The zero value is not close to zero -- it's more like 10% of the reference voltage (~0.25V), and the full scale value is about 25% of the reference. My gut says this should cause scale and offset errors due to the resolution of the constants.

Ted