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DS125BR111 / DS100BR111

Kai Hsiao
Guru 12675 points
Other Parts Discussed in Thread: DS100BR111, DS125BR111

Dear Sir

I have a 10GbE SFP+ active cable project 

Seems like DS125BR111 and DS100BR111 is p2p ,I would like to design DS125BR111 in this project  ,

Could I use DS125BR111 for 10GbE SFP+? Due to the SD_TH is not different with DS100BR111

BTW . I can't download DS125BR111's datasheet on the TI website ,Please kindly help to double confirm  

Thanks

  • 0
    TI__Mastermind 29655 points

    Hi Kai,

    Yes, the DS125BR111 can be used for 10GbE SFP+ applications.

    The DS125BR111 has a more linear equalizer and driver to preserve subtleties in the incoming waveform better. As a result, the DS100BR111 may be suitable for applications where a large amount of attenuation loss (>30 dB) overall is expected. Please check to ensure that the amount of EQ offered by the DS125BR111 is suitable for your project.

    In addition, although the DS125BR111 has the SD_TH feature, it is only for diagnostic purposes. There is no automatic mute function for the DS125BR111. The outputs for the DS125BR111 are always on. Setting the SD_TH threshold will only define whether Reg 0x0A[1:0] monitor reports a valid input signal status or not.

    I just checked that the DS125BR111 datasheet is currently available on TI.com. Please let me know if you have trouble downloading.

    Thanks,

    Michael

  • 0 in reply to Michael Lu (Santa Clara)
    Guru 12675 points

    Dear Micheal

    Thanks for your reply 

    I refer to DS125BR111's datasheet ,the EQ compensation is about 9dB at 10Gpbs

    Do you mean DS125B111's EQ+DEM+VOD could compensate attenuation loss up to 30dB or only EQ could compensate attenuation up to 30dB? I have a little confused 

     

    Thanks

     

  • 0 in reply to Kai Hsiao
    TI__Mastermind 29655 points

    Hi Kai,

    The DS125BR111 EQ and VOD cannot resolve 30 dB attenuation loss alone (note there is no DEM function in the DS125BR111). The value of the DS125BR111 is its ability to facilitate link training by using a super-linear EQ and buffered output while utilizing the processing ability of both Tx ASIC FIR and Rx endpoint post-processing, such as CTLE, DFE, and CDR.

    You are  correct that the DS125BR111 EQ is approximately 9.6 dB @ 5 GHz. It is the combination of the DS125BR111 inter-operating with its respective Tx and Rx endpoint processors that allows for successful link-up when overall loss is large.

    Thanks,

    Michael