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DP83848M: Question about use of Magnetics other then the recommended transformers

user5233567
Prodigy 170 points
Part Number: DP83848M

I searched for available Ethernet PHY and magnetic at operating temperatures of -55 to 125 and did found the DP83848M.

And i checked the magnetics requirements for the DP83848 family of devices in the Design & Layout Guide: www.ti.com/.../snla079d.pdf .

However I wish to use the Pulse 100B-1003X magnetics which is suitable to a broader range of temperatures.

There is a difference in the signal loss rate(insertion loss, return loss, etc) between the magnetics required by the DP83848M and the magnetics I want to use.

If I connect the DP83848M to the 100B-1003X, will there be a problem sending or receiving data?

Thanks.

  • 0
    TI__Mastermind 19780 points
    Hi user,

    The recommendation you found in the Phyter Design & Layout Guide is valid. If you connect the DP83848M to the 100B-1003C, you probably will not see problems sending or receiving data.

    Yet the characterization of the DP83848M was done with magnetics shown in the layout guide. You must qualify your system thoroughly with the 100B-1003X magnetics if you wish to use it.

    Typically a mismatch in return loss can cause more radiated emissions from the PHY as energy is reflected. Insertion loss can cause a reduction in total cable reach.

    I would expect you can achieve a functioning system with the 100B-1003X, but you should validate your design thoroughly yourself.

    Best Regards,