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DS90UB949-Q1: DS90UB949-Q1 design need urgent help

binquan xiang
Prodigy 20 points
Part Number: DS90UB949-Q1
Other Parts Discussed in Thread: DS90UB948-Q1,

We use DS90UB949 -Q1 to convert  HDMI to Dual FPD-LINK III, the HDMI signal is from Intel Gordon Ridge Module, and the deserializer is DS90UB948-Q1.

1, The I/O voltage of the HDMI signal is 1.05V, and the DS90UB949-Q1 HDMI input specification in the table below, do we need to add a level shift IC?

2. The HDMI source only support AC -Coupled output, how to setting DS90UB949-Q1 to compatible this，just supply VTERM 1.8V? And the value of the coupled capacitor,100nF?

3. How to deal with CEC if unused?

4. What is the VDD,DDC?

  • 0
    TI__Mastermind 30515 points
    Binquan,
    1. the DS90UB949-Q1 HDMI input specification is from HDMI V1.4b section 4.2.5, can you check the pairing device output spec.? It should include Vcm, Vdiff. and impedance parameters etc.;
    2. yes, you can refer to section 7.3 recommended operating conditions in UB949 d/s
    3. cec PIN can pulled up with a 27Kohms to 3.3V if unused
    4. the VDD, ddc is referred to RX _5V, compatible with V1.4b.

    regards,
    Steven