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DS90UB927Q-Q1: SERDES APPLICATION CONNECTOR SUGGESTION

Gencay Akyuz
Intellectual 305 points
Part Number: DS90UB927Q-Q1

Tool/software:

Hello,

We are working on a PCB design in which Automotive Ethernet and FDP-Link signals are routed to the same 4-pin D-coded M12 connector. The connector pinout can be seen in the attached image. Given their shared connector, we are concerned about potential crosstalk or EMI interference between them. Could placing Automotive Ethernet and FDP-Link on the same connector lead to significant interference or signal degradation, especially at high frequencies?

Thanks!

Best Regards.  

  • 0
    TI__Mastermind 37080 points

    Hi Gancay,

    Looking at the connector, it doesn't seem the recommended connector for FPD-Link. What is the data rate that you are running for Ethernet and FPD-Link signals? You may avoid crosstalk interference if you are carefully route the traces.

    Aaron

  • 0 in reply to Aaron Heng
    Intellectual 305 points

    Hello Aaron, 

    We are using a 100BASE-T1 PHY transceiver, so it should support 100 Mbps. The FPD-Link has not been tested yet, but we are planning to use a 4-lane LVDS display with 1280x800 resolution. So, I think it should be between 900-1900Mbps.

    • What is the recommended connector for the FDP-Link and can't we use a 4-pin D-coded M12 connector for our case?
    • Could signal crosstalk or interference occur at the connector or within the shared cable?

    Thanks!

  • 0 in reply to Gencay Akyuz
    TI__Mastermind 37080 points

    Hi Gencay,

    For 927 device, we recommended to use HSD connector. If you are using other connector, you need to make sure the connector meet the channel specs budget. In order to avoid crosstalk or interference, I would suggest to route them in a different layer and not in parallel.

    Aaron

  • 0 in reply to Aaron Heng
    Intellectual 305 points

    Hello Aaron,

    Thank you for all the answers you've provided.

    Finally, could there be any issues on the connector side or shared cable side if we use Ethernet and FPD-Link together as mentioned?

  • +1 in reply to Gencay Akyuz
    TI__Mastermind 37080 points

    Hi Gencay,

    Yes if you are sharing the Ethernet cable with FPD-Link, you will get the crosstalk from the Ethernet signal of 100 Mbps. The Ethernet cable is not properly shield and not rated for FPD-Link speed. We recommend customer to use DACAR 535-2 cable.

    Aaron