37.11.4.2 Performance with the hardware offset and gain correction
Inherent gain and offset errors affect the absolute accuracy of the ADC. The offset error cancellation is handled by the Offset Correction register (OFFSETCORR) and the gain error cancellation, by the Gain Correction register (GAINCORR). The offset and gain correction value is subtracted from the converted data before writing the Result register (RESULT).
| Gain Factor | Conditions | Offset Error (mV) | Gain Error (mV) | Total Unadjusted Error (LSB) |
|---|---|---|---|---|
| 0.5x | In differential mode, 1x gain, VDDANA=3.0V, VREF=1.0V, 350kSps at 25°C | 0.25 | 1.0 | 2.4 |
| 1x | 0.20 | 0.10 | 1.5 | |
| 2x | 0.15 | -0.15 | 2.7 | |
| 8x | -0.05 | 0.05 | 3.2 | |
| 16x | 0.10 | -0.05 | 6.1 |