28.4.5 ADC Input Considerations

The input impedance for the ADC determines the required change time, specified in ADC clocks or Tad. The impedance consists of the following internal resistances: the ADC channel select switch as well as any external resistance. The large external resistor values required to generate offsets may violate the device’s ADC input specifications. This may require the use of an internal amplifier op amp or PGA to isolate the ADC from the large resistance.

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