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Original question:

DS90UB960-Q1: Back Channnel Disable

DS90UB947-Q1: Back Channnel Disable and FPD-Link III Cable Reach Extension

Ikechukwu Anyiam
Mastermind 35130 points
Part Number: DS90UB947-Q1

Hi Team, 

Is it possible to disable the back channel on the DS90UB947/948? From the datasheet it looks like the back channel has to always be enabled. A customer would like to extend the reach of the cable to over 50m. This app note was referenced: 

http://www.ti.com/lit/an/snla103a/snla103a.pdf

 But it looks like this solution is not possible with the back channel. Another thread was posted here with more information: https://e2e.ti.com/support/interface/high_speed_interface/f/138/t/707723 

If the back channel can't be disabled, are there any other solutions for extending the reach of the cable for this device?

Regards,

I.K. 

  • 0
    TI__Genius 11340 points

    Hi I.K.,

    The application note you are referencing is for FPD-Link II, which is unidirectional and does not have a back channel.

    The DS90UB947/948 only supports FPD-Link III and would require a back channel to function. These devices are unable to extend the cable over 10m.

    Best,

    Jiashow