https://devzone.nordicsemi.com/f/nordic-q-a/16520/right-value-for-resistor-divider-input-adcHi All, I have a basic question, i want to know what are the right value to use with the nrf51422 chip for the resistors with ADC. I want to use the maximum value permitted for reducing consumption, say for example two resistors of 100 MOhms eachen-USTelligent Community 13Mon, 19 Sep 2016 16:30:49 GMThttps://devzone.nordicsemi.com/thread/63190?ContentTypeID=1Mon, 19 Sep 2016 16:30:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7918328d-033f-454d-ba14-0f4d3700576eCarsten Wulff<p>You will not get a 1/2 without a capacitor. The capacitor is required to limit the voltage change during conversion. To calculate the voltage change you first need to know the current. The current will be I = (Vin-0.6)/398k. Then the voltage change will be dV = I x conversion_time/capacitance.</p> <p>Then you need to check the settling time of the RC, but with 10min between samples it should be possible with large R.</p><div style="clear:both;"></div>