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DS280BR820: DS280BR820 selection confirm

Hailiang Zhang
Genius 11860 points
Part Number: DS280BR820
Other Parts Discussed in Thread: DS280DF810

Tool/software:

Hi Team,

The customer is extending the traces for the PCB of QSFP28 (the total length is 16 inches, the customer plans to put the redriver in the middle). Can you please confirm whether DS280BR820 is a suitable solution? Also, please suggest design considerations.

Regards,
Hailiang

  • 0
    TI__Mastermind 38723 points

    Hi Hailiang,

    The DS280BR820 is a potential solution.  The customer might consider provisioning support for DS280DF810, which fits the same socket, but requires 25 MHz clk.

    Using the DS280BR820, the placement of the device will be important.  I'd recommend that the customer perform simulation with their channel model to gain confidence in the device performance.  Placing the DS280BR820 in the middle will leave ~8 inches from DS280BR820 TX to QSFP28.  I think performing simulation of this would be valuable to see if the customer can meet their compliance spec at the QSFP port.  It's possible that the customer may need to move DS280BR820 closer to the QSFP so that their is less loss between TX and QSFP port.

    Also, what data rates does the customer plan to support?

    Thanks,

    Drew

  • 0 in reply to Drew Miller1
    TI__Genius 11860 points

    Hi Drew，

    Customer use QSFP100

    Drew Miller1 said:
    The customer might consider provisioning support for DS280DF810

    What are the advantages of DF810 for this application?

    Regards，
    Hailiang

  • 0 in reply to Hailiang Zhang
    TI__Mastermind 38723 points

    Hi Hailiang,

    The DS280DF810 is a retimer device, while DS280BR820 is a redriver device.  Retimer devices are more advanced signal conditioning devices that help reset the jitter in the signal by re-clocking the signal.  In the event that the customer has some signal integrity issues even when using DS280BR820, DS280DF810 may be able to help improve these SI issues.

    Thanks,

    Drew