• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 34 subscribers
  • Views 369 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

DS100DF410 driving passive cables

George Biner (Arrow)
Intellectual 705 points
Other Parts Discussed in Thread: DS100DF410

A potential customer for the DS100DF410 wants to know if it can drive a passive copper cable including connectors and if so how far.  I pointed out the front page of the d/s talks about driving passive copper to 10m, but customer reiterated this question, so please advise and verify this.  Any side documentataion on driving passive cables will be handy.  The connectors would be any and all industry standard front panel connector interfaces (QSFP, CFP, SFP+)

EAU 5k/yr.   

regards, G Biner, ARrow LA

  • 0
    TI__Expert 5175 points

    Greetings -

    This is a great question and it depends on several factors.  The DS100DF410 gives you a great starting point with its EQ, DFE, Retimer and Driver.  The Driver features adjustable VOD and also DE-Emphasis.  Yes, it is intended to drive long traces, connectors and or cable.  The length question is a factor of loss of the boards, connectors, and interconnect.  It also depends not only on the driver, but also the target receiver and or standard eye mask requirement there. 

    As a rough estimate at 10Gbps, start with highest VOD and maximum DE setting, and assuming looking for an open eye of 100mV and low jitter (~0.1UI), the DS100DF410 can drive say 4 meters of cable, or 20 inches of FR4. 

    A lower loss interconnect will be longer, and or a more sensitive target receiver will also allow for a longer reach.

    John Goldie
    Video Interface - DPS / SVA

  • 0
    TI__Intellectual 1985 points

    Hi George,

    Just to add on to John's comments, a good general guideline for the maximum passive copper cable length supported by the DS100DF410 is 10 meters of 30 AWG cable or better. Better meaning lower loss, which can be achieved with shorter or thicker gauge cables. As John pointed out, the maximum cable length depends on the capabilities of both the driver and the target receiver, and this 10 meter 30 AWG scenario has been validated with the DS100DF410 being driven by itself or by a similarly-capable driver.

    Casey Morrison

    Data Path Applications