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Magnetics design issue of DP83848Q

Jack Lin
Prodigy 220 points
Other Parts Discussed in Thread: DP83848K, DP83848I

Hi TI experts,

at page 63 of data sheet of DP83848Q, there is a list of recommended transformers.

I check the data sheet of Pulse H1102 and there is a difference with the data sheet of DP83848Q.

in Figure. 6-2 of data sheet of DP83848Q, the RD- signal from DP83848Q goes to the pin with starting wiring black round circle of T1,

and in data sheet of Pulse H1102, the RD- signal goes to the pin w/o starting wiring black round circle.

Please help me to identify which one is correct ?

please be noted that you could download the data sheet of Pulse H1102 from the link ,

http://www.mouser.com/pdfdocs/Pulse_1198.pdf

regards,

Jack

  • 0
    TI__Mastermind 19780 points
    Hi Jack,

    Both are correct. For simplicity of the schematics, you can follow the circle scheme in the Pulse transformer schematic.

    Best Regards,
  • 0 in reply to Rob Rodrigues
    Prodigy 220 points
    Hi Rob,
    Thanks a lot for your explanation, now I already got more understanding of the signal connections between PHY chip and the transformer no matter it's DP83848Q, DP83848k or DP83848I , I put a short summary as following, please correct me if it's wrong.
    1. There is not any rule said it should be TD+ or TD- (RD+ or RD-) be connected to the pin of transformer with dot indication.
    2. There is a rule said if TD+ be connected to the pin of transformer with dot indication then the other set of signal should be RD+ be connected to the pin of transformer with dot indication, it should not be RD-.
    regards,
    Jack
  • 0 in reply to Jack Lin
    TI__Mastermind 19780 points
    Hi Jack,

    Your points 1 and 2 are correct.

    Best Regards,