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DS25BR110: Equalization for a 125MHz clock

Mahesh KC03
Intellectual 1360 points
Part Number: DS25BR110

Hi,

One of customers is planning to use this device to recover a 125MHz gapped clock coming through a 10m CAT5E cable.
The device offers maximum if 16dB gain at 1.56GHz. Wanted to know if this can recover this 125MHz clock signal?

The loss plot for this cable shows that it has around 25dB attenuation at 125MHz

  • 0
    TI__Mastermind 43795 points

    High Mahesh,

    The attenuation plot is showing information for a 100m length of cable. 

    The DS25BR110 would not recover a 125 MHz clock at 100m cable length.

    For a 10m cable length, the attenuation would be ~ 2.5 dB and this amount of attenuation could be compensated for by the DS25BR110.

    The DS25BR110 has a linear equalization front end.  This type of circuit has lower gain at lower frequencies, so at 125 MHz much less than 16 dB of boost will be available to help the signal.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    TI__Intellectual 1360 points

    Thanks Lee. But could you confirm the gain offered at 125MHz by the DS25BR110? 
    Will it handle gapped clock without any issue?

  • 0 in reply to Mahesh KC03
    TI__Mastermind 43795 points

    The amount of gain at 125 MHz is not specified.  As a general rule of thumb a differential receiver can handle ~ -3 dB of signal without equalization, so the DS25BR110 will handle the 10m of cable with the 125MHz clock.

    Regards,

    Lee