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DP83869HM: DP83869HM and ONET4201LD/PA

Jean-Alexandre BARDON
Prodigy 10 points
Part Number: DP83869HM
Other Parts Discussed in Thread: ONET4201LD, ONET4201PA,

Hello,


I am using a DP83869HM with a ONET4201LD (for emitting) and a ONET4201PA (receiving) to send data with fiber. I have some questions :

- Should I place some termination resistance (100ohm or pull up) or all is included in the IC ?

- Is the ONET4201LD usable with frequency below 1Ghz ? (to do some test at 10Mbps)

- Which configuration should I use with the DP83869HM ? SGMII to copper mode, or Fiber mode ? (1000Base-T to 1000Base-X)

Thank you !

  • 0
    TI__Genius 11845 points

    Hi Jean-Alexandre,

    Are you able to provide a schematic?

    For your application, use SGMII to fiber mode.

    I will look into the proper termination scheme for your application.

    Kind Regards,

    Joe

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (www.ti.com/.../important-notice.shtml)

  • 0 in reply to Joe Vanacore
    Prodigy 10 points

    Hello, 
    Sorry, I don't give enough precision, and my shematic isn't finished yet...


    My aim is to design a RJ45 to fiber board at 1Gbps, like this : 
    RJ45 to DP83869HM, to ONET4201LD and ONET4201PA (SGMII), ONET4201LD to a diode, and the ONET4201PA to MAX3267(and a photodiode). (see attachment)

    For the SGMII, I just use two cap of 0.1µF in 0402, and no termination resistor.

    Best regards, 

    Jean-alexandre
    Laser card Ti forum shematic.pdf

  • 0 in reply to Jean-Alexandre BARDON
    TI__Genius 11845 points

    Hi Jean-Alexandre,

    Thank you for all of the information you provided. Since you want RJ45 copper to fiber connection, this is the mode you want: copper to fiber or 1000BASE-T to 1000BASE-X.

    You will have to configure the OP_MODE_DECODE register accordingly.

    Termination resistor selection will depend on the signaling use by the connected fiber device. For example, converting LVDS to LVPECL.

    Kind Regards,

    Joe

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (www.ti.com/.../important-notice.shtml)

  • 0 in reply to Joe Vanacore
    TI__Genius 11845 points

    Hi Jean-Alexandre,

    There haven't been any posts to this thread for quite some time. I will now close this thread. If you have further questions please respond to this post or start a new thread.

    Kind Regards,

    Joe

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (www.ti.com/.../important-notice.shtml)