https://devzone.nordicsemi.com/f/nordic-q-a/9731/nrf51822-adc-sensitivityNow, we are checking nRF51822 ADC sample program in SDK. When P0.1 input is lower than 0.7V, outputs is 0. We are wondering if the performance is correct. Could you please make a comment ? Is ADC performance correct? Or, our hard ware have somethingen-USTelligent Community 13Fri, 16 Oct 2015 02:48:11 GMThttps://devzone.nordicsemi.com/thread/36030?ContentTypeID=1Fri, 16 Oct 2015 02:48:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d71d77c6-3f58-4df2-864f-12473e3f3ba8T.shib<p>Dear Stefan</p> <p>Thank you for your quick advise. We will check ADC input line impedance.</p> <p>Best Regards.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/36029?ContentTypeID=1Thu, 15 Oct 2015 09:16:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1b53a6b5-5d06-4aae-8a7f-88f63cf9086eStefan Birnir Sverrisson<p>Hi</p> <p>My guess is that your connected circuit has high impedance. To compensate for the high impedance, one strategy is to connect a capacitor between the analog input pin and ground, see <a href="https://devzone.nordicsemi.com/question/990/how-to-measure-lithium-battery-voltage/">this thread</a>, but that has limitations on the ADC sampling frequency. Another method is to insert an amplifier between your circuit and the analog input pin.</p><div style="clear:both;"></div>