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Original question:

SN75DP139: SN75DP139RSBR HDMI IN

SN75DP139: About HDMI in

Gabriel Wang1
Genius 4955 points

Part Number: SN75DP139
Other Parts Discussed in Thread: TMDS181, TMDS171, TDP0604

Dear Sir

Regarding the application of the SN75DP139RSBR chip, I have some questions:

1. The application scenario of the chip involves converting DP++ to TMDS. Since our input is an HDMI socket, if it is connected to the HDMI interface of a computer, will it work properly.

2.in the reference circuit of SN75DP139RSBR, there is a 50 ohnm pull-up resistor on the signal line to 3.3V for TMDS termination. If SN75DP139RSBR must be applied to the HDMI interface, are these resistors necessary for assembly? Will this meet the DC coupling requirements?

  • 0
    TI__Guru**** 187071 points

    Hi,

    1. The application scenario of the chip involves converting DP++ to TMDS. Since our input is an HDMI socket, if it is connected to the HDMI interface of a computer, will it work properly.

    If the input is HDMI, then you can use TDP0604, TMDS171, or TMDS181 as possible solution.

    2.in the reference circuit of SN75DP139RSBR, there is a 50 ohnm pull-up resistor on the signal line to 3.3V for TMDS termination. If SN75DP139RSBR must be applied to the HDMI interface, are these resistors necessary for assembly? Will this meet the DC coupling requirements?

    Yes, as a HDMI source expects to see 50ohnm pull-up resistor termination network on the signal line to 3.3V. But please note this will create double termination network and source signal amplitude will be reduced. It will be better to use a re-driver or re-timer that is dedicated to the DC coupled HDMI interface.

    Thanks

    David