The internal OPA of the MSPM0 has a chopping feature which reduces the drift of the OPA. This chopping is configurable to adapt to different use cases and signal chains. The chopping must be adjusted to the ADC-assisted chopping mode when using the ADC in oversampling and averaging mode. This adjustment prevents the chopping frequency from interfering with the averaging feature of the ADC. Figure 4-1 is a resulting histogram showing two maxima in the distribution of a series of values where the standard chopping mode is used with ADC averaging. Figure 4-1 demonstrates that the effective resolution of the signal chain is significantly reduced.

Figure 4-1 Histogram of ADC Samples When Using Standard Chopping While ADC Averaging