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Digital and Analog power Supplies

Discussion in 'Electronic Design' started by [email protected], Jun 9, 2006.

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  1. Guest


    I have the need to design Video ADC, on the chip im thinking about
    using (ADV7181B) states the desired need to use seperate Analog and
    Digital Power Supplies.

    However I dont really want to have to supply another supply, as this
    will complicate my design more than it need be.

    The board I have is an FPGA board, so there will be the issue of noisey
    power supply I suppose caused by digital logic.

    What is the best way to use the power supply for my ADC but also has
    the digital components in?

    Any articles or information would be greatly recieved


  2. Roger

    Roger Guest

    You don't need 2 power supplies, you just need to 2 connections. The
    digital and analog will have seperate pins, you use seperate PCB tracks
    from the pins to the decoupling capacitors. You may also like to use LC
    filters, a small but low resistance inductor in series with the
    supplies with caps on each side. You would probably take your analog
    tracks up to the power supply rather than hanging them onto the digital
    supply lines. What you are basically trying to avoid is having digital
    circuits being supplied from the PCB tracks your analog circuits are
    feeding from.

    Many data sheets and app notes for analog/digital devices will give
    examples, or you could just look "evaluation boards" for high end
    chips, you will probably find the PCB layout in the online
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