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TLK106: magnetics requirements

julia pflibsen
Prodigy 10 points
Part Number: TLK106

Tool/software:

A few questions:
1. What magnetics are required to work with the TLK106?

2. Is there any version of RJ45 with magnetics that has a breakout board that would work with the TLK106 for some benchtop testing?

3. Do you know if the sparkfun RJ45 with magnetics would work? http://www.sparkfun.com/datasheets/Prototyping/MagJack.pdf (SparkFun RJ45 MagJack Breakout BOB-1302)

4. Why do magnetics allow an ethernet interface to function?

5. Can you use AC coupling instead? https://www.ti.com/lit/an/snla088a/snla088a.pdf?ts=1693325757331&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FDP83848-EP

    a. is there a length concern?

    b. why would you need ac coupling on each end of the cable? or just one?




www.ti.com/.../tlk106

  • 0
    TI__Mastermind 36430 points

    Hello,

    Thank you for your query. We are experiencing limited support due to the Holiday season. Please expect a response by EoW.

    Sincerely,

    Gerome

  • 0 in reply to Gerome Cacho
    TI__Mastermind 22962 points

    Hi Julia,

    For context, is your system in design or evaluation stage? TLK106 is not recommended for new designs due to limited support, so I can help suggest alternative PHYs if needed.

    Regarding your queries:

    1) Please refer to this table for recommended spec on magnetics. If integrated magnetics are used, please verify the termination network in Figure 7-1 of datasheet is being followed relative to internal magnetic circuit.

    2) I'm not aware of an RJ-45 including both a breakout board and integrated magnetics. There are many "RJ-45 Breakout Boards" available from 3rd party suppliers that can be used to probe the MDI pins after the cable connection.

    3) It's unclear if this model would work, the cable-side termination does not follow datasheet recommendation. Please refer to this model, this has been validated on TLK106EVM:
    https://www.mouser.com/datasheet/2/447/pulse_hx1198nl-2904259.pdf

    4) It is possible to have applications without magnetics for Ethernet. However, they are generally recommended to improve isolation between PHY & cable-side connection, and to improve signal integrity. This will improve performance during compliance and EMC/EMI testing.

    5) AC coupling without magnetics is possible. AC coupling requires caps on all MDI pins for the internal PHY MDI termination to function properly. For length recommendations, please refer to this layout checklist:

    https://www.ti.com/lit/zip/snlr048

    Please also refer to TLK10xL EVM user guide, this will provide more details on the recommended design:

    https://www.ti.com/lit/ug/sllu200/sllu200.pdf

    Thank you,

    Evan