https://devzone.nordicsemi.com/f/nordic-q-a/101580/adc-inputsGood morning I have a schematic for the 52840 uP. I dump here The ADC inputs are fed with a 100K resistor. It is expecting a high impedance input. My question is : does it work? For what I know out of other uP the analog input is not a high impedanceen-USTelligent Community 13Fri, 07 Jul 2023 12:33:46 GMThttps://devzone.nordicsemi.com/thread/435242?ContentTypeID=1Fri, 07 Jul 2023 12:33:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:20dc7336-30c5-4d61-9039-eb825ccc2d96pietrodcs<p>Ok.</p> <p>Thank You</p> <p>Pietro</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/435240?ContentTypeID=1Fri, 07 Jul 2023 12:31:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:75b22546-4914-47c6-927b-2fe279fa2e02Bendik Heiskel<p>Hi Pietro,</p> <p>The 100k source resistance should be OK, you just have to make sure the acquisition time is long enough for the voltage across the internal capacitor to stabilize. For 100k at least 10us is needed.</p> <p><a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/saadc.html?cp=5_0_0_5_22_0_0#concept_qh3_spp_qr">https://infocenter.nordicsemi.com/topic/ps_nrf52840/saadc.html?cp=5_0_0_5_22_0_0#concept_qh3_spp_qr</a></p> <p>&nbsp;</p> <p>Best regards,</p> <p>Bendik</p><div style="clear:both;"></div>