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Can DS90C187 support 1080p

anthony durand
Prodigy 30 points
Other Parts Discussed in Thread: DS90C187

Dear,

I'm currently designing an embedded screen 9" with 1080p resolution. This screen uses dual lvds pixel to get this resolution. My source supplies 24 bits RGB 1080p and I can set the pixel clock if it's needed inside the range of the component.

To convert 24 bits RGB to Dual LVDS pixel I would like to use the DS90C187, I have seen that it can drive QXGA and WQXGA but the datasheet doesn't mention about the 1080p class display.

 I have check the clock rate that can support the DS90C187 and it seems okay for the 1080p but I would like to be sure before going further in the design.

Thanks.

  • 0
    TI__Guru* 76130 points

    Moving to high speed forum.

    Regards

  • 0
    TI__Expert 3050 points

    Hi Anthony,

    Yes the DS90C187 can support 1080p displays.

    In the single pixel in to dual pixel out (SIDO) mode, the DS90C187 will support up to a 185 MHz input pixel clock. 1080p60 interfaces typically use a pixel clock around 150 MHz, depending on the blanking. This leaves with 30 MHz until you reach the maximum limit for the DS90C187.

    If you have any other questions, please let me know!

    Mike Wolfe

    DPS APPS / SVA

  • 0 in reply to anthony durand
    Prodigy 30 points

    Hi Mike,

    We are using Altium Designer and I'm wondering if you have the .schlib and pcb.lib for this component or another extension that I could use? I tried to import a file .DSN from another forum but it did not work.

    Also the voltage level from RGB data and clock from my processor is 3.3V, the DS90C187's input accepts max 1.8V so I would like to use the SN74AVCBH324542 to adapt my levels. But I have seen that the input transition rise or fall rate is 5ns/V and I'm afraid to have a problem because the  frequency of Pixel CLK is 150Mhz as you said.

    Could you tell me if my doubts are right or not? If yes do you have another component that could fit ? 

    Thanks.

  • 0 in reply to anthony durand
    TI__Expert 3050 points

    Hi Anthony,

    This part was released using Allegro for the EVM board design. We do not currently have Altium symbols for this device.

    I can put in a request with our Altium team to have a footprint and schematic symbols made if you wish. Please note that depending on our loading it may take some time.

    The device you mentioned, SN74AVCB324245, does have an IBIS model available. So you could simulate the output waveforms at 150MHz to see what kind of margin is available. Also keep in mind that the clock is toggling at 185 MHz, but the data is toggling at half that rate (~75MHz).

    Mike Wolfe

    DPS APPS / SVA