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ADC12DC105: Regarding the handling of AGND and DRGND

Kyohei
Expert 1400 points
Part Number: ADC12DC105

Tool/software:

Hi team,

How should AGND and DRGND be handled?

  1. Prepare separate GND planes and connect them at a single point under the ADC. (To prevent the influence of digital noise.)
  2. Connect using a GND plane. (A completely common ground)

Best regards,

Kyohei

  • 0
    TI__Mastermind 37960 points

    Hi Kyohei,

    Please use a single ground plane. Good circuit partitioning is key for a proper layout.

    This means, keep clocking circuits in their respective area, keep all digital circuits within their respective area and all analog circuits within their respective area, etc.

    If you need help in reviewing your layout when ready please let us know.

    We are happy to help.

    Regards,

    Rob

  • 0 in reply to Rob Reeder
    Expert 1400 points

    Hi Rob,

    Thank you for your reply.

    Is it correct to assume that layout (2) is the recommended one?
    Also, in case of layout (1), AGND and DRGND are connected near the exposed pad on the solder side of the ADC. Would this cause any issues?

    Best regards,

    Kyohei

  • +1 in reply to Kyohei
    TI__Mastermind 37960 points

    Hi Kyohei,

    Yes, layout 1 is the recommendation.

    In the case of layout 2, where a and d grounds are separated, there should be a tie point as close to the ADC as possible. Or under the ADC, as you stated above. However, if you tie this point together, then this really puts you back to layout one. You never really needed to separate the ground planes to begin with.

    Regards,

    Rob