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DP83TC812S-Q1: What is the amplitude of 100BASE-T1 link-signal for VDDMAC is connected to 1.8V-, 2.5V- and 3.3V-rails?

Jaidev Kaniyil
Prodigy 70 points
Part Number: DP83TC812S-Q1

Tool/software:

I would like to know as to whether the amplitude of the differential signal across MDI (TRD_P and TRD_M pins) will be dependent on the VDDMAC-voltage.   If we would like to increase the SNR over a long cable, can we increase the amplitude of the signal across TRD_P and TRD_M?

Regards,

Jaidev

  • 0
    TI__Mastermind 36763 points

    Hi Jaidev,

    Part of 100Base-T1 compliance testing is verifying amplitude.  Would you want to increase amplitude beyond value suggested by compliance testing?

    Note VDDMAC is used for MAC interface and VDDIO is used for GPIO.  TRD_P/TRD_M are in VDDA domain.  We recommend keeping supplies within recommended operating conditions.

    Thanks,

    Drew