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LMX2592: Register Settings

Kenji Ohno1
Genius 5095 points
Part Number: LMX2592

Hi Team,

I have two questions.

1.VTUNE_ADJ

Customer is using 6.5GHz or higher and had the setting set to '0'.

Does this cause any problems?

2.CP_ICOARSE

The datasheet recommends setting it to '0' or '2', but they are set to '1'.

Specifically, how much does this change the accuracy of the lock detect circuit?

Will this be a problem in operational use?

Best Regards,

Kenji

  • +1
    TI__Guru** 108270 points

    Hi Ohno-san,

    VTUNE_ADJ is newly added to provide an option to extend LMX2592 VCO7's operation to a bit lower temperature. The guaranteed lower limit is still -40C, but you will see that if we change VTUNE_ADJ = 1, the actual operation temperature could be a bit lower than before.

    CP_ICOARSE is recommended to limit to x1.5, as we saw very small percentage of issues with x2 and x2.5. Lock detector might report unlock but in fact, it is locked. To reduce confusion, we suggest keep CP_ICOARSE = x1 if possible, and = x1.5 if necessary.