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how to route codec (ADC/DAC), analog pins not all on one side
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loki42:
Here's the updated routing, I've switched to 4 layers and the ground isn't split. I am a bit confused about what to do with the power plan given all the different voltages I've got. Otherwise if there's any other feedback I'd love to hear it. I'm crossing all the analog differential output signals at one place with the digital signals. I'm still a bit worried about where the digital signals being routed near the 5VA power.

I think I have placed the decoupling caps as suggested but I'm not sure if you mean something else. If there's any other advice on getting closer to the full performance (though I know 24 bit is tough!) of the codec I'd love to know.
mrjoda:
Hi,

avoid the acute angles, it's called Acid traps (google some PCB layout guidelines). I do not like the routing of 3V3VA to oscillator. I would not share one capacitor and one trace with power pad of chip.  Otherwise it looks better than in previous case.

There are many other things that should be improved, like grounding vias for example, loop reducing and etc. 
loki42:
I'm not sure what you mean by the 3V3VA to oscillator, there are 3 caps there. I've made the power traces planes on a separate layer though I'm not sure if that's a good idea as the multiple different power planes will be over a single ground plane. Not sure if that's better or worse than just running traces.
SiliconWizard:
There are a bit too many vias in this thermal pad IMO. This could cause definite soldering issues, unless the vias are plugged, which would be costly and unnecessary here. Just a thought. A thermal pad is not swiss cheese either. ;D
loki42:
That's just the default footprint from TI. I'll reduce the number.  Their paste layer is a bit weird too.  The recommend just one big aperture. 

Any advice on the 3.3 / 5v / 5v analog power planes?  Should I run the split power planes or use traces?
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