https://devzone.nordicsemi.com/f/nordic-q-a/65746/adc-input-issue-input-pulls-sometimes-lowHello, i have a strange issue with my analog input. Every few seconds (not the same database) my signal is getting pulled low. But i dont know why. The external signal is stable, i tested it with a oscilloscope. I meassure the voltage of a piezoen-USTelligent Community 13Thu, 10 Sep 2020 10:58:22 GMThttps://devzone.nordicsemi.com/thread/268930?ContentTypeID=1Thu, 10 Sep 2020 10:58:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a06e8ff5-6722-4494-9fda-8dbb72826e16ketiljo<p>The internal capacitor of the ADC will load the circuit when the acquisition starts. So if you have a very high impedance source, the voltage will drop when the ADC is turned on and starts to sample. Use a small capacitor near the pin to buffer the voltage. Same principle as here:&nbsp;<a href="https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/measuring-lithium-battery-voltage-with-nrf51">https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/measuring-lithium-battery-voltage-with-nrf51</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/268784?ContentTypeID=1Wed, 09 Sep 2020 14:15:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4afa25b5-01c1-4242-af39-5a6318da3377Akadir<p>Hello @<a class="internal-link view-user-profile" href="https://devzone.nordicsemi.com/members/maxrpeng">MaxRPEng</a>,</p> <p>I am interested in ADC at Bluetooth , can you share your code or some reference codes?</p><div style="clear:both;"></div>