5.2.1 Oversampling

The Series Accumulation mode can be used to achieve higher ADC resolution. For example, by using 1024 12-bit samples, a 17-bit result could be achieved.

To increase the resolution, for each additional bit of ADC resolution, n, the signal must be oversampled 4ⁿ samples. To achieve 17-bit ADC, an additional 5-bit resolution is needed. Hence, the signal has to be sampled 4⁵ = 1024 times. To scale the result down to the desired resolution, it must be right-shifted by n which is equivalent to dividing the result by 2ⁿ.