• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 3 answers
  • Subscribers 34 subscribers
  • Views 2122 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.

DS90UB953-Q1: Cable type recommended for FPD link with cable length up to 1.5m

Jung-Ho Seo
Expert 5930 points
Part Number: DS90UB953-Q1

Dear experts,

Customer is reviewing DS90UB953/954 for FPD link for MIPI Camera interface. The distance from AP to Camera is in the range of 30cm ~1.5m.

In this case, what kind of cable can we recommend for this application ?  Only coax cable can be used for FPD link ? 

Thanks,

JH.

  • 0
    TI__Genius 16890 points
    Hello JH,

    You can use either single-ended coax or shielded-twisted pair (STP) for the FPD link between the DS90UB953 and 954. See section 7.1 and register 0x03 in the DS90UB953 datasheet.

    Mike
  • 0
    TI__Guru** 107510 points

    Hello,

    what do you mean by AP?

    generally, for FPD-Link you can use either Coax or STP/STQ cables.

  • 0 in reply to Hamzeh Jaradat
    TI__Expert 5930 points

    Hi Hamzeh,

    Thanks for answer.

    AP means Application Processor to receive 954 data as below.

    Cam --> 953(Ser) --> connection cable --> 954(Des) --> AP

    One more question,  Is it possible to use FPCB(flexible PCB) for connection between 953 and 954 instead of coax, STP/STQ ?

    Thanks,

    JH..

  • 0 in reply to Jung-Ho Seo
    TI__Expert 5930 points
    Hi Hamzeh,
    One more question from customer.
    In case of coax, Is there limitation of cable diameter ?
    They have 0.64~0.8pi of coax. Is this okay to be used ?
    What is feasible max length of coax cable ?
    Thanks,
    JH.
  • 0 in reply to Jung-Ho Seo
    TI__Guru** 107510 points

    Hello JH.

     

    They can use FPCB instead of Coax or STP. But they have to make sure that they do not have EMC/EMI issues. You know the cable has always shielding but the FPCB not! Also the traces on the FPCB should be 50 ohm for Single ended and 100 ohm for differential pairs.

    There is no limitation for cable diameter for FPD-Link itself, but this may affect the max. PoC and increase the cable loss.

     

    We do not specify max. length of a cable since there are different manufacturers and cable types. What we specify is the maximum allowed insertion loss and return loss on the link.

     

    Coax Channel requirements


     

    Differential Channel requirements