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LMH1218: Lock Time

Part Number: LMH1218


I am trying to get more information on lock time. Does anyone have measured lock times?

The datasheet states that the lock time is "From signal detected to the lock asserted". What exactly defines "signal detected" and is there a time estimate for that?

The reason I ask is because we're looking at a similar architecture using an FPGA/VCXO, and most VCXOs I've looked at, have lock times in the hundreds of milliseconds.

  • Hi Denise,

    Signal detect refers to when device detects there is signal on input. Signal is detected when LOS pin becomes de-asserted. Therefor lock time is from LOS being de-asserted to when Lock pin becomes active.

    LMH1218 device has onboard VCO running at SDI clock rates and this makes it much faster to lock.

    Regards,,nasser