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DS125BR111: SN75LVPE802

Harish Ilamvazhuthi
Prodigy 50 points
Part Number: DS125BR111
Other Parts Discussed in Thread: SN75LVPE802, , DS64BR111, DS100BR410

Tool/software:

Does the SN75LVPE802, DS125BR111 IC support an extended maximum cable length of over 2 meters.

  • 0
    TI__Mastermind 28620 points

    Hi,

    Both DS125BR111 and SN75LVPE802 haven't been characterized with cable lengths. Whether or not these devices can support your application will depend on the data rate of transmission and the insertion loss of the cable at Nyquist frequency.

    DS125BR111:

    • Table 4 in the datasheet shows EQ boost capability. The max EQ boost is 9.8dB @ 6GHz. This likely isn't enough to compensate a 2m cable.

    SN75LVPE802:

    • Table 1 in the datasheet shows EQ boost capability. This device has limited EQ configurability.

    I can help to recommend a redriver for your application if you share the following information.

    • What is the protocol used?
    • What is the data rate of transmission?
    • What is the insertion loss which needs to be compensated at Nyquist frequency?
    • How many channels/lanes need to be supported?
    • Are the channels/lanes unidirectional or bidirectional?

    Best,

    Lucas

  • 0 in reply to Lucas Wolter
    Prodigy 50 points

    Hi, thank you for your response

    • What is the protocol used? - SATA Interface
    • What is the data rate of transmission? - SATA 2.0 or better
    • How many channels/lanes need to be supported? - 1 CH - SATA
    • Are the channels/lanes unidirectional or bidirectional? - Unidirectional (Separate Tx & Rx)
    • Also, Please confirm 4CH Part number is support for 2m cable ?
  • 0 in reply to Harish Ilamvazhuthi
    TI__Mastermind 28620 points

    Hi Harish,

    Thank you for sharing a bit more information. I still don't quite understand how many lanes/channels need to be supported, so here are a few recommendations which support SATA 2.0 and 3.0.

    • DS64BR111: 1 lane birdirectional, meaning one differential pair oriented in each direction
    • DS65BR401: 4 lanes bidrectional, meaning 4 differential pairs oriented in each direction
    • DS100BR410: 4 channels unidirectional, meaning 4 differential pairs oriented in one direction

    It's still unclear to me if these redrivers have enough EQ boost to compensate for your cable, without knowing the insertion loss. We have high-speed models available for these devices which you can use for simulation with your cable model. Please let me know if you are interested in receiving high-speed models, and for which part numbers.

    Best,

    Lucas