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LP-EM-CC2745R10-Q1: multi-spikes on the 48M crystal

Albin Zhang
Expert 5840 points
Part Number: LP-EM-CC2745R10-Q1

Tool/software:

Hi, 

my customer found the multi-frequency when they probe (coupling) the 48MHz signal. it is difference with CC2642 platform (it is very clean 48MHz)

why the phenomenon is happening? what's the impact to performances potentially?  

BR. Albin

  • 0
    TI__Expert 7695 points

    Hi Albin,

    I've assigned someone from the team to support you in your question. Please expect a response tomorrow.

    Best,

    Nima Behmanesh

  • 0 in reply to Nima
    TI__Intellectual 1220 points

    Albin,

    I'll try to duplicate this in the lab with 1 of my LPs and I'll try to provide results soon. In the meantime, are you able to output an RF tone? If so, what's the frequency accuracy of the RF signal? If you adjust the cap bank setting in SmartRF Studio, does this affect the measured 48MHz coupled signal?

    Regards,

    Andrew

  • 0 in reply to Andrew Lugo
    TI__Expert 5840 points

    Hi Andrew, 

    All the RF is good and the cap tuning works well. this is customer's feedback. I don't have the coupling probe, so can't do the test in my lab. 

    so this is why I asked "potentially" ：）just worries about the PLL unlock or lock to other freq.

    BR. Albin

  • 0 in reply to Albin Zhang
    TI__Intellectual 1220 points

    Albin,

    Let me discuss this with a designer and I'll report back to see if there would be any concerns with what the customer is seeing. It's good to hear that the CC device is operating normally. I'll report back as soon as I get the feedback. 

    Regards,

    Andrew