Part Number: CC2640R2F
I need to use a CC26xx counter to determine the frequency of an RF input signal up to 50Mhz. I could not locate specs on maximum input frequency to the 32-bit counters, but have seen reports of issues with edge counting at 100 kHz, so now this is a bigger concern.
Since I don't require high accuracy (within 10 kHz should be accurate enough), I was thinking of sampling an edge counter every 20 to 50 msecs to determine the frequency of the incoming signal. I would prefer not to use an external prescaler or Schmitt trigger circuit, as the signal will be at least 3 v p-p.
Is this likely to work up to 50Mhz or will another approach be needed in addition to the CC26xx counter?
