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LMK03033: Reference clock design

Part Number: LMK03033

I found a circuit problem recently, and the problem is that I feed a 10MHz refernce clock with 3 Vpp to LMK03033. The datasheef recommanded maximum value is 1.6Vpp. The function seems worked many years, but I sitll want to know if any side effect to this situation.

  • Thanks for posting on E2E. I have assigned your post to the responsible engineer. He will respond to you soon.

    Kind regards,
    Lane

  • Dear Lane,

    The 3.3V CMOS 10MHz TCXO is directly AC coupled to OSCin pin of LMK03033C. The function seems be ok from -40 degree to 60 degree, but I want to know if it exist any potential threat.

    It's an urgent issue. Plese help to reply it as soon as possible. Thanks!

  • Hi Michael,

    I've seen cases where if the input amplitude is too high, the input detection fails and the PLL doesn't lock. Please note that we only characterize the device up to the datasheet limit. We are unsure of what happens beyond that limit. So we definitely recommend operating the device exactly as datasheet requires.

    Regards,

    Hao