43.4.9.5 Additional S/H Capacitance

Additional capacitance can be added in parallel with the internal S/H capacitor (C_HOLD) by using the ADCAP register. This register selects a digitally programmable capacitance that is added to the ADC conversion bus, increasing the effective internal capacitance of the S/H capacitor in the ADC module. This is used to improve the match between internal and external capacitance for a better sensing performance. The additional capacitance does not affect analog performance of the ADC because it is not connected during conversion.