• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 33 subscribers
  • Views 842 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

Interface between optical transceiver and MUX DS25MB100T- regarding

vijayavani raju
Prodigy 220 points
Other Parts Discussed in Thread: DS25MB100

Hi,

   Our optical transceiver vendor has suggested to connect the SERDES interface as shown below,

For your information the Optical transceiver transmitter ports are LVPECL (DC coupled) logic. We are connecting these pins to DS25MB100 MUX IN+/- pins. DS25MB100 already has internal termination, so please suggest how can we connect these devices.

Note: We already tried AC-coupled connection. It is working for continous transaction and not working for Burstmode transaction.

  • 0
    TI__Expert 8915 points

    Hello,

    Please note that I have moved this post to the high speed interface forum where customer support for the DS25MB100 is available.

    Regards,

    Alex.

  • 0 in reply to Alex Davidson
    TI__Guru* 91830 points

    Greetings,

    I would have suggested AC coupling but it seems perhaps due to the RC time constant burst mode is not as reliable. 

    The schematic you have shown creates 50 Ohm termination for the DS25MB100. However, i am worried that your optical transceiver also has termination as well and this may create a double termination environment. Please check to make sure the eye amplitude and etc meet your optical module electrical requirements.

    Regards,,nasser

  • 0 in reply to Nasser Mohammadi
    Prodigy 220 points

      Thank You Naseer. We are having this problem only for the Input interface of DS25MB100. As per the datasheet of the Optical transceiver, the RXD (output) pins are DC-Coupled LVPECL. The vendor suggested the following termination, But it is not working reliably.

    Thanks & Regards,

    G. R. Vijayavani