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LMX2594EVM: Phase Noise with Reference Pro Board

Manuel Fuenfer
Prodigy 20 points
Part Number: LMX2594EVM
Other Parts Discussed in Thread: LMK61PD0A2, , LMX2594

Hallo,

I am intrested in the phase noise reachable with reference pro board (containing the LMK61PD0A2 Oscillator).
Do you have any phase noise plots of the suggested setup in the LMX2594EVM user guide (100MHz differential LVPECL reference Signal)?

How good is the phase noise compared to the on-board crystal?

Thanks,
Manuel

  • 0
    TI__Mastermind 27691 points

    Phase Noise Plot - 100 MHz LVPECL.xlsxManuel,

    I took a plot of the reference pro phase noise at 100 MHz for LVPECL, single-ended.

    Differential phase noise will be very similar, maybe lower far out noise floor, but this doesn't matter as it is filtered out by the PLL.

    Think of inputs in this order of degrading noise quality:

    1.  Ideal

    2. 100 MHz Wenzel X)

    3. 100 MHz XO on LMX2594 EVM

    4.  100 MHz (CWX-813) XO used on previus EVMs

    5. 100 MHz Reference Pro

    10.  Signal Generator (Very bad phase noise)