https://devzone.nordicsemi.com/f/nordic-q-a/100312/input-impedance-of-nrf52840-comparatorHi we want to connect the build-in analog comparator to a signal source which has output impedance as about 11kohm, this is designed to trigger system to wake up. in the forum I see similar question as this one https://devzone.nordicsemi.com/f/nordicen-USTelligent Community 13Thu, 01 Jun 2023 07:28:06 GMThttps://devzone.nordicsemi.com/thread/428617?ContentTypeID=1Thu, 01 Jun 2023 07:28:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2b74ccd7-ca0e-4100-88ad-e0a65eb47d92ketiljo<p>The input if fed into a op-amp. Which, by design has a high impedance input.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/428406?ContentTypeID=1Wed, 31 May 2023 10:32:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:77c228a6-9ce2-48fd-90ef-452609ea4fb2Poplar<p>Hi Ketijo</p> <p>thanks for the replay, is this a designed value or tested value? I have not seen that in datasheet.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/428401?ContentTypeID=1Wed, 31 May 2023 10:29:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:17eb3598-c7b9-4f09-a214-e23f2df12800ketiljo<p>The input of the comparator is high impedance, &gt;&gt; 1 Mohm. A lot higher than the 11 kohm output impedance of the trigger circuitry.&nbsp;</p><div style="clear:both;"></div>