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HDMI to LVDS (30bit colour)

Phillip Suthers
Prodigy 55 points

Other Parts Discussed in Thread: DS90C3201, TFP401

Hi,

I need a solution to convert a HDMI signal to LVDS 30bit (3x10bit RGB) colour depth.

I found your application note for converting HDMI to 24bit LVDS, but was wondering if you had any newer chips since that was written which support the higher colour depth.

I spotted the DS90C3201, but wasn’t sure about the input interface.

Cheers

Phil

  • 0
    TI__Mastermind 29655 points
    Hi Phil,

    The DS90C3201 is a serializer that converts 3 x 10 RGB color depth into its corresponding OpenLDI LVDS output (in this case, there would need to be 5 x LVDS data pairs and 1 LVDS clock). However, the DS90C3201 only supports RGB inputs for single-to-single pixel or dual-to-dual pixel applications (as opposed to single-to-dual). Thus, if you have a device that takes in the HDMI signal and outputs 30-bit RGB, then you can use the DS90C3201.

    I am not sure if we have a device that takes in HDMI and outputs 30-bit RGB that can go before the DS90C3201. I will reach out to my High-Speed Interface colleagues to comment.

    Regards,

    Michael
  • 0 in reply to Michael Lu (Santa Clara)
    Prodigy 55 points

    Thanks Michael. 

    Have you had any response from your colleagues yet?

    Cheers

    Phil

  • 0 in reply to Phillip Suthers
    TI__Mastermind 29655 points
    Hi Phil,

    Thanks for checking in on this post. I recently heard back from them, and unfortunately there is not an HDMI-to-10-bit RGB converter device in TI's portfolio.

    Michael
  • 0 in reply to Michael Lu (Santa Clara)
    Prodigy 55 points

    Thanks Michael,

    Would it be possible to use the TFP401 to interface to the DS90C3201 and tie the two least significant bits for each colour to ground on the DS90C3201? This would only be 24bit colour, not 30bit (which I can live with), but give me the 2x30bit LVDS outputs.

    TI’s feature description says the DS90C3201 supports 30, 24 and 18bit LVDS color data outputs. I couldn’t see any configuration information in the datasheet for these options. Do they need to be hard wired at the input level?

    Cheers

    Phil

  • 0 in reply to Phillip Suthers
    TI__Mastermind 29655 points
    Hi Phil,

    Sorry for the delay in response. I was out on vacation until today.

    You can certainly use the TFP401 to interface to the DS90C3201, but you will only get the 24-bit color, as you have mentioned.

    If you wish to use this type of interface, the DS90C3201 will support 24 and 18 bit color resolutions if you hard-wire them correctly at the input level. I recommend using the wiring that is typically seen for VESA standard color mapping. There is no specific "configuration" pin that sets 30, 24, or 18 bit color for the DS90C3201.

    Thanks,

    Michael