https://devzone.nordicsemi.com/f/nordic-q-a/54789/saadcHi Nordic I am using saadc example now, my device output voltage range is -4v~4v. my saadc config: VDD: 3.3V Reference: VDD/4 Gain: 1/4 Mode: SINGLE_ENDE i got wrong number when the input voltage is negative and over VDD. I saw &quot;The AIN0en-USTelligent Community 13Mon, 25 Nov 2019 07:33:07 GMThttps://devzone.nordicsemi.com/thread/221741?ContentTypeID=1Mon, 25 Nov 2019 07:33:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:955424c2-e178-4e54-936a-1340d4d3a90e1730143<p>Thanks Turbo J</p> <p>&quot;Adapting -4 ... +4V signal onto an 0..3,3V ADC input pin usually requires an opamp (or instrumentation amplifier) circuit.&quot;</p> <p>Dose it mean that i can&#39;t achieve it with software?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/221725?ContentTypeID=1Sun, 24 Nov 2019 23:52:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:104e3189-c9f7-40e6-8bc2-a1cacde386eaTurbo J<p>Remember to check ABSOLUTE MAXIMUM rating. I recommend using another chip for further tests, as -4V voltage on a pin is likely to cause permanent damage.</p> <p>Adapting -4 ... +4V signal onto an 0..3,3V ADC input pin usually requires an opamp (or instrumentation amplifier) circuit.</p><div style="clear:both;"></div>