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DP83825I: vs DP83826

Christopher Costa
Prodigy 10 points
Part Number: DP83825I
Other Parts Discussed in Thread: DP83826EVM

Tool/software:

Hi,

I have a need for a 100MBP, 150 Meter capable ethernet repeater (with and without PoE injection capability).  Looks like either the 83825 or 83826 would work.

Is there an advantage one over the other?  Both state they can be used in back-to-back mode and from what I can tell, the 83826 setup can be run off of a 25MHz crystal and does not need configuration to work at 150M is that correct??  Also, which has better (longer distance) performance?  Lastly, is there reference design showing back-to-back operation?

Many thanks,

CC 

  • +1
    TI__Mastermind 30700 points

    Hi Christopher,

    The advantages of DP83826 vs DP83825 are mentioned in their datasheets under 'Device Family Information'. Furthermore DP83825 does not support a MII MAC interface while DP83826 does. DP83825 must use an RMII MAC interface.

    Christopher Costa said:
    the 83826 setup can be run off of a 25MHz crystal and does not need configuration to work at 150M is that correct?

    Yes DP83826 can be run on a 25MHz crystal and can be enabled through hardware strapping. There is no requirement for software configuration if your hardware strap settings are correct.

    Christopher Costa said:
    Also, which has better (longer distance) performance?

    I would recommend DP83826 for longer cable applications. From the datasheets, DP83825 has 'up to 150m' while DP83826 has '>150m' of cable reach.

    Christopher Costa said:
    is there reference design showing back-to-back operation?

    I'm not aware of any reference designs that use DP83826 in a back to back configuration. We do have our DP83826EVM that can help with the MDI-side implementation. If you've got a 150m cable already, it could be a good idea to test with the DP83826EVM as a proof of concept.

    Best,

    Shane

  • 0 in reply to Shane Hauser
    Prodigy 10 points

    Excellent thank you.  I would like to submit a schematic for design review when completed if possible.

  • 0 in reply to Christopher Costa
    TI__Mastermind 30700 points

    Certainly Slight smile

    You can reply to this thread with the schematic when it is ready or  submit another E2E ticket.

    Schematic files can be shared directly in the forum post. If you wish to share a schematic privately there is a direct message feature on E2E as well.

    Best,

    Shane