https://devzone.nordicsemi.com/f/nordic-q-a/83272/periodic-noise-in-saadcHello, I test SAADC on nRF52810, when I short gound to AIN0, the output is 0 normally, and when I add nothing to Pin I0(AIN0), the output is around 1056(Figure0), however when I just connect Dupont Line without anything to Pin I0(AIN0), the output seemsen-USTelligent Community 13Thu, 06 Jan 2022 03:09:35 GMThttps://devzone.nordicsemi.com/thread/346330?ContentTypeID=1Thu, 06 Jan 2022 03:09:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:935d209f-9e93-4120-b9cd-58c527314f7aticture<p>Hello, thanks for your reply, I finally found that the noise come from the computer power adapter, thank you very much for your help:)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/345671?ContentTypeID=1Mon, 03 Jan 2022 13:03:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d307d063-b38d-48b3-b928-861b7bfd6128Simonr<p>Hi</p> <p>I don&#39;t see any issue with this, what do you expect to see on a floating ADC line if not a sine wave like this? I&#39;d recommend setting a load on it (probably somewhere in the Mega-Ohm range) to get rid of this sine wave.</p> <p>Other than that I think your schematics look fine, but keep in mind that you need to configure your project to use the internal RC oscillator as a clock source for the 32.768 kHz LF clock when you don&#39;t have an external LF crystal on P0.00 and P0.01. The example projects in our SDK generally configure the nRF to use the external crystal by default.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>