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LMH0302 with a single-ended input as opposed to a differential input

Maxime ATHEE
Prodigy 740 points
Other Parts Discussed in Thread: LMH0302

Hello,

My customer as the following issue,

Could you please give him support ?

Hello, I am trying to use the LMH0302 with a single-ended input as opposed to a differential input. The datasheet says this is possible but I cannot see any application notes on how to do this. Can you assist? Kind regards,

Thanks, Maxime

  • 0
    TI__Mastermind 29635 points
    Hi Maxime,

    To use the LMH0302 with a single-ended input, you would simply need to assure that the unused input is properly terminated (in this case, connect the unused input with 50-ohm to GND on the other side of the cap so that the polarities are as symmetric as possible. This assumes that the active input uses a 50-ohm connection.

    Can your customer elaborate on the reason behind using a single-ended input?

    Thanks,

    Michael
  • 0 in reply to Michael Lu (Santa Clara)
    Prodigy 10 points

    Sorry for the poor quality scan but do you mean like this?

    We are aiming to reuse components, hence using the LMH0302 with a single-ended input.


    Thanks for your help so far

  • 0 in reply to Andre Barnshaw
    TI__Mastermind 29635 points
    Hi Andre,

    This is almost correct. By terminated, we mean that the unused input is terminated with a 50-ohm to GND. The schematic you have for SDI# looks correct. On the active input side, you can remove the 50-ohm termination on the left side of that top line.

    Since it is assumed that you have a 50-ohm characteristic impedance media connected to the active input (SDI), there would not be a need for an extra 50-ohm termination on the active line.

    Thanks,

    Michael