https://devzone.nordicsemi.com/f/nordic-q-a/66840/saadc-clock-sourceHello, I developed an application on a BMD-300-EVAL. This is a evaluation platform with a BMD-300 module (nrf52832 chip + antenna + crystal +...) on it. The application uses the SAADC and the SoftDevice s132. The SAADC reads four channels with a sampleen-USTelligent Community 13Thu, 08 Oct 2020 12:54:01 GMThttps://devzone.nordicsemi.com/thread/273754?ContentTypeID=1Thu, 08 Oct 2020 12:54:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:77fe1b68-240e-4e18-b82e-0408d4bfce3cKenneth<p>The timers will use whatever clock source is currently running, so unless you have explicit started external HFCLK for instance, then it will run on the internal HFCLK by default. The internal HFCLK can be very inaccurate (e.g. several %), it&#39;s only by starting the external HFCLK that you will get a tolerance of &lt;40ppm of the timers.</p> <p>I think you are mixing LFCLK and HFCLK here,&nbsp; if you are using timers (it will use HFCLK), if you are using RTC (it will use LFCLK).</p> <p>Best regards,<br />Kenneth</p><div style="clear:both;"></div>