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LMK04828: meths about App:LMK04828 as a Clock Source for the ADS42JB69

Part Number: LMK04828
Other Parts Discussed in Thread: ADS42JB69

Hi,

I am learning application report“LMK04828 as a clock source for the ADS42JB69”,and i have a problem about the calculating.

with ideal clock(only 85fs aperture jitter),SNR@230MHz = 72.66dB??


the following is copied from App note:

where am i wrong?