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LMH1981: Cable Equalizer

Kotaro Yamashita
Intellectual 2250 points
Part Number: LMH1981

Hi,

My customer would like to use LMH1981 as GENLOCK circuit. In this case,  This circuit don't need cable equlizer? D/S Figure 2. mentioned no cable equlizer test circuit. 

Regards,

Kotaro Yamashita

  • 0
    TI__Genius 16845 points
    I'm not very familiar with this device, but I will try to help here. A cable equalizer may be needed if driving long cable lengths.

    Kind regards,
    Lane
  • 0 in reply to Lane Boyd
    TI__Intellectual 2250 points
    Hi Lane,

    They are considering LMH1981 with following conditions. Is that ok w/o equalizer?
    Cable: 200m
    Signal: 1080p


    Regards,
    Kotaro
  • 0 in reply to Kotaro Yamashita
    TI__Genius 16845 points

    Hi Kotaro,

    The circuit in Figure 2 expects a low-noise, broadcast quality input signal. Long cable length will degrade signal integrity. An equalizer may be required for a 200m cable.

    The customer might test the quality of the input video signal to LMH1981 after 200m cable to determine whether an equalizer is necessary. Alternatively, the customer might run a simulation using the driver, cable, and/or equalizer IBIS models.

    For more assistance with equalizers, please submit a new post to the appropriate forum and the responsible engineer can assist you further.

    Kind regards,
    Lane