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DS125BR111: Use for USB GEN1/GEN2 redriver

TerryU
Prodigy 145 points
Part Number: DS125BR111
Other Parts Discussed in Thread: TUSB1002A

Hi, Experts,

I would use DS125BR111 as a redriver for USB GEN1/5Gbps and GEN2/10Gbps. Are there any technical points for the design on board trace, setting and so on?

Best regards,

Tetsu

  • 0
    TI__Mastermind 25048 points

    Hi Tetsu,

    Relative to the board trace requirements, please see the following notes:

    - Limit the maximum attenuation to -34 dB @ 6 GHz for the entire channel (recommended to model and simulate this if reaching the upper bounds for attenuation)
    - Use 100Ω traces, loosely coupled to simplify routing length differences.
    - Place AC-coupling capacitors near the receiver end of channel segments to minimize reflections.

    Are you able to share more information about the application, such as board trace material/length (expected insertion loss), and whether link training is present in the signal chain? This will allow me to share a more precise recommendation for the redriver register settings.

    Thank you,

    Evan

  • 0 in reply to Evan Mayhew
    Prodigy 145 points

    Hi Evan,

    Thank you for your rapid response.

    I would use it for redriver for USB 3.1 GEN2 device. It is put next to HD3SS3320, TYPE-C MUX. However trace impedance is 100Ω... It might be use other choice.

    Is TUSB1002A prefer?

    Thanks,

    Tetsu

  • 0 in reply to TerryU
    TI__Mastermind 25048 points

    Hi Tetsu,

    Evan Mayhew said:
    - Use 100Ω traces, loosely coupled to simplify routing length differences.

    I should clarify that this 100Ω recommendation is the differential impedance. What is the intended trace impedance of your application?

    I expect both TUSB1002A and DS125BR111 to work in this case, although DS125BR111 may be preferable due to lower power consumption. Are you able to share more information about the application requirements?

    Thank you,
    Evan