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A practice I have used in the past that seems to work when doing this type of layout is - Kepp the grounding system seperate between digital and analog except for one point. (keep ground loops away). I also have connected the two grounds loosely through a low ohm resister rather than a hard connection. Also be careful about high analog trace currents or high frequency digital coupling from one to the other. Use Right angles when traces cross one another on top and bottom of board. This will minimize the coupling between the two signals. In other words don't run the two signals in parallel with each other on top and bottom.
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