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TMDS181 schematic review

Vio Liu
Expert 3045 points
Other Parts Discussed in Thread: TMDS181

Hi team,

My customer, CVT, plans to use TMDS181 in their education product . Could you please help review the schematic? Thanks.

Seewo-CVT-TMDS181-sch.pdf

Best regards,

Vio Liu.

  • 0
    TI__Mastermind 23815 points
    Hi Voi Liu,

    First of all, there is no internal forum anymore, if yo want to share schematics or layout you may want to send these files via email or place a HelpMe ticket.

    Schematic looks good, I just have some comments:
    You could add 10pF and 4.7pF to each power supply node to improve high frequency noise performance.
    Value of OE cap depends on Vdd/Vcc ramps, just take into account you may need to change it for a higher value.

    Why R22, R23, R26, R27, R28, R33, R34, R35, R36 are 5.1 ohms instead of 0 ohms?
    Why there are 0 ohms resistors on HDMI lanes?
    Recommended value for R31, R32 is 47k

    Regards
  • 0 in reply to Moises Garcia
    TI__Expert 3045 points

    Hi Moises,

    Thanks for your reminder. Customer are using 5.1 Ohm just in case of noise interference on the long wire, are these resistors OK?

    0 Ohm resistors are used on HDMI lanes for easy debug. 

    I can see the short circuit current of control pins is 50mA. So i think 2kOhm is OK, also the noise immunity is enhanced. 

    Thanks again for your help. 

    Best regards,

    Vio Liu