• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 32 subscribers
  • Views 143 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS110DF111: How long of cable can I drive?

Zack Schwarz
Prodigy 260 points
Part Number: DS110DF111
Other Parts Discussed in Thread: DS125DF111

Hello, 

Can you help me understand how to calculate how long of a cable DS110DF111 / DS125DF111 can drive? Are there any internal register settings to increase the output drive strength?

Would a buffer help complement this device in terms of driving longer cable lengths -> i.e. 20in – 24in?

Thanks,
Zack

  • 0
    TI__Mastermind 18720 points

    Hi Zack,

    There are a lot of factors in addition to length which affect the performance of a cable, so there isn't a simple calculation for cable length that can be driven by a retimer. Is there a specific cable you are considering using with DS110DF111 and do you have an s-parameter model for it? I can provide an IBIS model if you would like to simulate a link.

    Channel register 0x2D[2:0] can be used to adjust output driver VOD strength.

    If a cable's insertion loss is within 30dB then the retimer can compensate this by itself, but a buffer with some equalization capability can be helpful for cables with greater insertion loss.

    Best,

    Lucas

  • 0
    TI__Prodigy 260 points

    Hi Lucas,

    Thanks for the feedback. I will work to confirm the exact cable and if I can get an S-parameter model. Can you provide the IBIS model? That might be useful. 

    Thanks,
    Zack

  • +1 in reply to Zack Schwarz
    TI__Mastermind 18720 points

    Hi Zack,

    I sent you an email regarding the IBIS model.

    Best,

    Lucas