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LMX2592: LMX2594 to LMX2592 migration consideration?

AnBer
Mastermind 28890 points
Part Number: LMX2592
Other Parts Discussed in Thread: LMX2594, , LMX2582

Team,

Can you please help with the below questions:

LMX2594. We would like to consider to use LMX2592:
https://www.ti.com/assets/js/compareParts/compare.html?familyId=1325&parts=LMX2592,LMX2594,LMX2595&cols=o1,p3318,p2928,p1099min,p1099max,p2409,p1496,p2192,p2931,p1130,p1498,p1192,p1811,p2954,p1549typ,o4&lang=en

-Is that 1:1 compatible (ie P2P drop-in replacement) since they are both VQFN | 40 | 6x6mm?
-We are generating a clock of 3 GHz from the LMX2594. Can we just replace it by the LMX2592 and use the same Firmware SW  to control it, and the same HW (PCB design, power tree, ..etc) circuit and expect exactly the same behaviour ?

Thanks in advance,

A

  • 0
    TI__Guru* 81400 points

    Hi AnBer,

    Hardware:

    As for pinout, they are the same, except for pin 5.  For the LMX2594, this is SYNC and the LMX2582, this is NC

    The loop filter is passive components that are optimized to the VCO frequency and charge pump gain. The  VCO gain, VCO frequency, and charge pump gain are different for the LMX2594 and LMX2592, so you might want to re-design the loop filter that would involve changing a few of these external components.

    Software:

    As for programming, they are similar, but not the same programming.  The LMX2582 has a different VCO frequency and divider values, but many of the field names may look familiar.

    The LMX2582 does not support the SYNC and Ramping features that the LMX2594 does.