https://devzone.nordicsemi.com/f/nordic-q-a/4773/rf-frequency-tolerance-questionI have a general question about the RF frequency tolerance of Nordic devices in general. Is the following calculation correct? Crystal spec = 16MHz, +/-50ppm tolerance, +/-30ppm stability. RF Carrier Frequency set for 2457MHz. The PLL willen-USTelligent Community 13Thu, 11 Dec 2014 09:01:37 GMThttps://devzone.nordicsemi.com/thread/16885?ContentTypeID=1Thu, 11 Dec 2014 09:01:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:95d438f9-6580-4334-8d37-e0868b2902daAsbj&#248;rn<p>Yes, I would recommend you to tighten it up a bit. Good luck:)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/16884?ContentTypeID=1Wed, 10 Dec 2014 18:04:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cc9d59d1-364f-477d-b427-84e14700586cmichaelbester101<p>Thanks. We are currently using a crystal that has 80ppm tolerance, and thought it may be a good idea to use a better (tighter) tolerance crystal. :)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/16883?ContentTypeID=1Wed, 10 Dec 2014 18:01:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ff41213d-5416-4915-a28e-0a912e33afbcAsbj&#248;rn<p>The carrier is generated directly from the 16 MHz as you say. So the tolerance of the crystal will also be the accuracy of the carrier, just as you say. The product specification states that the total tolerance can be +/-50ppm. Not +/-80 ppm.</p> <p>Other than that it&#39;s correct.</p><div style="clear:both;"></div>