I'm drawing a board with an MCU (running at 32 MHz), some serials and an analog video section (mux and amplifiers). I kept the video section physically separated from the digital one: i.e. it's placed on the right part of the board, while all digital signals run on the left. There are no digital tracks that cross analog ones.
I tried to keep video signals perpendicular to each other and, where not possible, to place among them a ground pouring to minimize cross-talk.
I'm afraid about power supply noise. The source is a DC-DC converter, placed on the left-most side of the board. From there, I routed two big traces (100 mil), one to supply the logic section and another to supply the analog one.
I think in this way the digital noise is minimized. The ground plane is the same, but between the digital and analog area is connected just in one point.
In which way I could further clean and filter the power supply trace near the analog side? By-pass capacitors along the track are enough or you would recommend some LC filter? The expected maximum current is about 300 mA @ 5V.