CC2652P: What is the best way to measure the frequency of the 48MHz (crystal) oscillator

Damien BOSCA

Part Number: CC2652P
Other Parts Discussed in Thread: CC1352P

in order to be able to check/adjust the value to record on the CAP ARRAY,
how to measure the frequency of 48MHz crystal?
1. should we use smartRF Studio to send a continuous carrier and measure its frequency?
2. can we simply generate a PWM output by the CC1352P and measure its frequency, because of the compensation circuits and such, is this as reliable?

Thanks.

Damien.

over 3 years ago

0 Alexis Crandall20 over 3 years ago

TI__Genius 15590 points

Hi Damien,

Yes, the best way to measure the accuracy of the HF crystal oscillator is to output an unmodulated carrier wave from the radio and measure the frequency offset from the wanted frequency using a spectrum analyzer.

Section 6.4 of SWRA640 is a good resource for this.

Thanks,

Alexis

0 Damien BOSCA over 3 years ago in reply to Alexis Crandall20

Intellectual 560 points

Thanks Alexis,

Is there a way to generate an unmodulated carrier using RF driver commands (I don't find it), or do we have to use smartRF studio?

Damien.

+1 Alexis Crandall20 over 3 years ago in reply to Damien BOSCA

TI__Genius 15590 points

Hi Damien,

SmartRF Studio will probably be the easiest way to do this, but there's also an example in the SDK called rfCarrierWave (examples>rtos>LP_CCxxxx>drivers)

Thanks,

Alexis

+1 Damien BOSCA over 3 years ago in reply to Alexis Crandall20

Intellectual 560 points

Nice,

Thanks Alexis.

Damien.

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CC2652P: What is the best way to measure the frequency of the 48MHz (crystal) oscillator