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LMK04208EVM: Can't get PLLs locked

Stephan Dunkl
Prodigy 10 points
Part Number: LMK04208EVM
Other Parts Discussed in Thread: LMK04208

Hi,

hopefully anybody can help me. I'm about to despair, because i can get the PLLs of the evaluation board locked.

Some basic data of my aim:

input frequency: 13.56MHz, output frequencies: 13.56MHz; 27.12MHz & 216.96MHz; right now i'm using the lmk04208 evaluation board & TICS Pro software for setup

attched a screenshot of the actual settings.

Does anybody have any ideas/suggestions what i'm doing worng ?

thanks in advance

  • 0
    TI__Expert 5370 points
    Dear Stephan,

    thank you for seeking help. We will try to help.

    You did not mention anything about the VCXO. The EVM comes with a 122.88 VCXO so you will not be abel to tune to 216.96 MHz with the EVM as is. You need to change the VCXO for your configuration...

    I hope this helps,

    Regards, Simon.