The sampling rate of the ADC has significant influence on the effective resolution of the whole signal chain. Defining the effective sampling rate for this evaluation is necessary since the oversampling and averaging features are used in this test. The effective sampling rate is defined by Equation 4.

Figure 4-2 shows the dependency of the effective resolution on the effective sampling rate. This test was executed with the complete signal chain shown in Figure 4-2 but with a constant gain setting of 2 resulting in an internal OPA with a total amplification factor of 100.

Figure 4-2 demonstrates that the effective resolution becomes higher as the sampling rate lowers. Figure 4-2 results in 12.88 bits at an effective sampling rate of 1.8 kSPS. Increasing the effective sampling rate up to 62.5 kSPS results in the effective resolution for this configuration remaining at 11.14 bits.