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LMK00301: Harmonic of lmk00301 output

Part Number: LMK00301

Hi All,

   I cannot find the harmonic spec from the datasheet of lmk00301,but the output harmonics of the device on my board are very large, even to the 11th and 12th harmonics.All the 10 differential pair are used with LVPECL output in my application.Buffer is different from clock, but why is its harmonic still so large?

Regards.