37.6.3.4 Gain and Offset Compensation

A specific offset, gain and shift can be applied to each source of the SDADC by performing the following operation:

Data = (Dat a_{0} + OFFSET) \times \frac{GAIN}{2^{SHIFT}}

Where:

Data0 is an unsigned integer defined on 16 bits. It is the output of the decimation filter.

OFFSET is a signed integer defined on 24 bits (OFFSETCORR register).

GAIN is an unsigned integer defined on 14 bits (GAINCORR register).

SHIFT is an unsigned integer defined on 4 bits (SHIFTCORR register).

The result of the operation is then saturated to be within [0:216-1] and the 16 LSBs of this saturation operation are sent to the controller as the result of the SDADC conversion.

Offset error can be compensated by setting the Chopper mode ON, refer to the ANACTRL37.7.21 Analog Control.ONCHOP bit.