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ANALOG/ DIGITAL .NOISE

Discussion in 'Electronic Basics' started by Fritz Oppliger, Aug 30, 2004.

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  1. In a ribbon cable I have analog signals on one side, digital stuff on the
    other edge. I found the digital traffic was influencing the analog so I
    went to a wider ribbon cable. better separation. Now I have a couple of
    unused conductors in the middle.

    Do I connect these unused wires to:
    analog ground
    digital ground
    earth ground
    leave unconnected

    If this looks like homework, well it IS, in my homebrew electronics
    self-education.
    I could have the connections jumper- selectable.
    from the sublime to the ridiculous.
    I value your opinions first.
    Thank you.
     
  2. I would vote for analog ground.
     
  3. Kevin Kilzer

    Kevin Kilzer Guest

    Do not connect them to earth ground. It is too much hassle in most
    systems. E.g., where is "earth" on a 9V battery? Also, it probably
    leads to other, weird problems.

    I would vote for digital ground, because this will prevent the digital
    currents from being forced into the analog ground paths. There are
    other ways to guard against this, but if you start with lower digital
    ground noise you will probably be better off in the long run.

    Kevin
     
  4. Rich Grise

    Rich Grise Guest

    If you have more than one wire in the middle, use half for digital
    ground and half for analog. If there's an odd number, digital gets
    the odd one.

    Cheers!
    Rich
     
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