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DS90UH949-Q1EVM: Which capacitor for 949 DOUTx ?

Mike Hayes
Prodigy 40 points
Part Number: DS90UH949-Q1EVM
Other Parts Discussed in Thread: DS90UB949-Q1

Tool/software:

Hello, I have a question about the DS90UB949-Q1. In the data sheet for pins 22, 23, 26, & 27 (DOUTx), it says to use 33nF capacitors for interfacing with 94X desers. However, in the schematic for the 949 EVM, it shows 0.1µF capacitors being utilized on those pins. Additionally, my 949 EVM is working with my 948 embedded display. It is difficult for me to make out which capacitors are actually in place on my EVM, so, is there a misprint in one of the data sheets or ? Which capacitor is actually required/recommended for the 949 DOUTx pins to interface with the 948 serializer?

Also, same question for CEC pin. 949 EVM shows 10k resistor in the data sheet but 949 IC data sheet recommends 27k. Kindly advise which one.

  • 0
    TI__Guru 66880 points

    Hello, 

    Monday 2/17 is a US public holiday, support will resume on Tuesday 2/18. Thanks for your patience. 

    Regards, 

    Logan

  • +1
    TI__Mastermind 37870 points

    Hi Mike,

    The AC coupling caps for the FPD-Link signal pins should be able to work with either value. Please refer to 948 datasheet for updated value. I will log this value mismatch for upcoming datasheet revision.

    Per CEC specification, the CEC pin of the HDMI connector should be pulled up to a 3.3V supply via 27K ohm resistor. Please ignore the EVM resistor value.

    Aaron