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LMK61E07: Clock Stability

Allan Fan
Expert 6250 points
Part Number: LMK61E07
Other Parts Discussed in Thread: LMK61E08

Hi Expert,

Customer used our LMK61E07 for BCM65408 70.656Mhz clock and its spec mentioned like below < 1Hz

However, from their measurement, the stability 3.66Hz looks failed. Would you please provide any suggestions about it? Can LMK61E07 meet their need?

Thanks,

Allan

  • 0
    TI__Expert 6140 points

    Hello Allan, 

    I have received similar question with same measurement technique/equipment on LMK61E08 (which is the same just with different PLL N divider fractions). The excerpt you have pulled doesn't seem to be from the datasheet, correct? I don't see it on there... 

    Why is the assumption that device can hold <1 Hz stability? This is not OCXO... 

    The total stability of the device is defined as +/- 25 ppm, which would equate to 1000+ Hz. Yes this over temperature and other parameters, but still <1 Hz is not achievable with 

    Thanks and regards,

    Amin