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DP83TG720S-Q1: 1000Base-T1 Application Help

Christian Torres
Prodigy 10 points

Part Number: DP83TG720S-Q1
Other Parts Discussed in Thread: DP83TG721EVM-MC, DP83869HM, DP83869

Hello,

I'm looking to get in touch with an Applications Engineer to get some insight/design support for 1000Base-T1 applications.

There are a couple of applications I would like to discuss. Does TI have such personel, or is all support confined to public forums?

Any information would be greatly appreciated. Thank you for your time and help.

Best,

Christian

  • 0
    TI__Expert 5572 points

    Hi Christian, 

    Please post your question here. 

    Best,

    Charles

  • 0 in reply to Charles
    Prodigy 10 points

    Hi Charles,

    Thank you for your reply. My first question has to do with the Rise/Fall times of the TRD+/- signals from the DP83TG721x-Q1 PHYs. I know it depends on several factors, but is there any reference documentation or simulation models that could help me determine these values?

    Secondly, I am interested in the DP83TG721x-Q1 PHY for a media converter application. The objective would be to convert from T1 to Fiber.

    I have seen the DP83TG721EVM-MC mentioned in the PHY's datasheet showing a use case where the PHY is connected back-to-back with the DP83867 over RGMII to convert it to 1000Base-T. Could the DP837G721x-Q1 be connected back-to-back with the DP83869HM via RGMII to convert it to fiber instead?

    Thank you again for your time and help. Please let me know if either of my questions are unclear.

    Best,

    Christian

  • +1 in reply to Christian Torres
    TI__Expert 5572 points

    Hi Christian,

    1. We don't measure rise time for TRD+/- signals. Instead, DP83TG721 conforms to IEEE 802.3 standard for PMA. These tests include PSD and transmitter jitter specifications which take the place of rise time measurements. 

     DP83TG721 has an IBIS file available. Perhaps this can help you determine the rise time values. Please request for secure resource access on the 721 product page for the .ibs file. 

    2. Yes. You can connect DP83TG721 back-to-back with DP83869. Unfortunately, we don't have an EVM design for this. My recommendation is to use the existing DP83TG721EVM-MC design files as reference and replace DP83867 with DP83869. 

    Best,

    Charles

  • 0 in reply to Charles
    Prodigy 10 points

    Hi Charles,

    Thank you for your reply and for pointing me in the right direction for the IBIS model.

    I also appreciate your confirmation regarding the DP83TG721 and the DP83869.

    I will look into the reference design and proceed from there.

    Thanks again for your time and help.

    Best,

    Christian