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LMX2595: cannot lock frequency

Cherry Zhou
Mastermind 22235 points

Part Number: LMX2595

Hi team,

Here's an issue from the customer may need your help:

The LMX2595RHAR sometimes does not lock in frequency. The 6G signal can sometimes be locked or sometimes not. But with another frequency point (4.5G), there is no such behavior. 

When cannot lock the frequency, as shown in the figure below-the VT signal is also a voltage:

Could you help check this case? Thanks.

Best Regards,

Cherry

  • 0
    TI__Genius 12720 points

    Hi Cherry,

    It seems the VCO is not calibrating properly and it shows unlock.

    Is the customer testing on LMX2595EVM or on their custom board? If there custom board, can we have LMX2595 schematic and used TICS pro config file for debug? Are they seeing the issue in multiple boards?

    Thanks!

    Regards,

    Ajeet Pal