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LMK1D1204: Input clock

Nandini Muralidharan
Intellectual 750 points
Part Number: LMK1D1204

Tool/software:

Hi,

I find the differential inputs are crisscrossing the LMK buffer's input side (All the LVDS crystals seem to have "N" at pin5 & "P" at Pin4 causing the crisscross)

Is there any EVM for LMK1D buffer where an actual oscillator is used? I want to see how the crisscross is avoided.

I can put the oscillator on the other side of PCB but that adds a pair of vias in the path.

The Osc I am using is SG3225VAN100.000000M-KEGA3 but almost all oscillators seem to have similar pinout creating a crisscross.

Thanks

  • 0
    TI__Expert 3090 points

    Hi Nandini,

    There is no EVM for the LMK1D buffer line that features an on-board oscillator.

    Could you include a scope shot showing this crosstalk (with one input one, one off)? The easiest way to avoid crosstalk would be to use clock input that are not directly next to each other, neighboring input pins on the buffer may have crosstalk, especially if one of the inputs is being driven by an on-board crystal oscillator.

    Thanks,

    Michael