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DP83TC812S-Q1: TIDA-020060

Yeseul Lee
Prodigy 10 points
Part Number: DP83TC812S-Q1
Other Parts Discussed in Thread: TIDA-020060,

Tool/software:

Hi,

I have some questions about 100B-T1 PHY and PoDL.

You already developed PoDL for DP83TC812S-Q1, which is TIDA-020060 reference EVB.

Did you have the experience of compliance test for TIDA-020060?

I think the inductor for PoDL causes the jitter problem. I want the tips for that.

If you passed the compliance test including podl, I would like to apply DP83TC812S for our project.

Best regards,

  • 0
    TI__Genius 9209 points

    Hi Yeseul,

    Yeseul Lee said:
    Did you have the experience of compliance test for TIDA-020060?

    Do you mean PMA testing? 

    Yeseul Lee said:
    I think the inductor for PoDL causes the jitter problem. I want the tips for that.

    Can you elaborate on the inductor causing a jitter problem?

    Yeseul Lee said:
    If you passed the compliance test including podl, I would like to apply DP83TC812S for our project.

    I will check to see if we have more information on PMA compliance testing with the TIDA-020060

    Best regards,

    Nick

  • 0 in reply to Nick Peabody
    Prodigy 10 points

    According to IEEE, we should do compliance test of Jitter, droop, power spectral density, return/modeconversion loss about PHY.

    It is also called PMA testing.

    I think the inductor is connected to MDI signal lines, that causes saging the signal, this means jitter problem.

    If it is wrong, please tell me.

    If you have the information or document about PMA testing of DP83TC812S, please contact me..

    Best regards,

  • 0 in reply to Yeseul Lee
    TI__Genius 9209 points

    Hi Yeseul,

    We do have compliance reports for PMA testing for the DP83TC812S. Let's move this conversation to an email thread so I can share those documents.

    my email is n-peabody@ti.com

    Yeseul Lee said:
    inductor is connected to MDI signal lines

    The TIDA020060 has a common mode choke on the MDI lines for Ethernet 1000BASE-T1 (ADF32T-800N).

    A CMC could cause jitter if it is not a large enough inductor. 

    4.7μH +50,-30% at 100kHz

     is the ADF32T-800N in the TIDA design

    and 

    200 µH @ 100 kHz

    is the DLW43MH201XK2L which is recommended for the 812

    That is a pretty significant difference in inductance. Is the customer currently failing jitter compliance?

    Best regards,

    Nick

  • 0 in reply to Nick Peabody
    Prodigy 10 points

    Thank you for reply,

    I will send you an email.

    The PMA testing document you have is including podl?

    In the TIDA design, if we mount PID77S-180M, what should we mount at the CMC?

  • 0 in reply to Yeseul Lee
    TI__Genius 9209 points

    Hi Yeseul,

    No, it is just for the DP83TC812. I will check internally if we have PMA compliance documentation with the TIDA.

    Yeseul Lee said:
    In the TIDA design, if we mount PID77S-180M, what should we mount at the CMC?

    https://www.ti.com/lit/ug/tiduf49/tiduf49.pdf 

    See table 3-4

    -Nick

  • 0 in reply to Nick Peabody
    TI__Genius 9209 points

    Hi,

    I checked internally and we do not have PMA compliance report with Jitter for the TIDA-020060.

    Best regards,

    Nick