AN2535

1.4.1 Differential Input without Gain

With this setting, the MUX measures the difference between two input signals. In differential mode without gain, all ADC inputs can be used for the positive input of the ADC but only the lower four pins can be used as the negative input. When using differential mode, the offset can be measured quite easily by setting up the positive and negative input on the same pin, and the offset can be measured directly as the ADC does not need to know where the ground level is.

Figure 1-3. Differential Input without Gain Stage

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