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LMX2571 - FPD condition for Figure 60

Kawai
Guru 19785 points

Hi Team,

Could you please tell us the condition for the following figure 60, Phase Noise vs Input Clock characteristic ?

Is PDF all the same condition for crystal, TCXO and LVPECL, as 26MHz ?

Best Regards,

Kawai

  • 0
    TI__Guru** 107810 points
    Hi Kawai-san,
    The test condition is same for all type of inputs being used.
    OSCin = 26MHz
    fpd = 104MHz
    Prescaler = 2
    DEN = 2^24
    Fout = 480MHz
    Dither = Disabled
    3rd order modulator
    PFD_Delay = 4
    Total Icp = 2.5mA
    Default EVM loop filter
  • 0 in reply to Noel Fung
    Guru 19785 points
    Hello Noel-san,

    Thank you for your reply.

    fpd is limited to 40MHz when used in crystal mode, so fpd would be different for each type of inputs.
    I believe input reference clock 26MHz and Fout 480MHz is the common condition for all types.

    Best Regards,
    Kawai