It is not so much grounding the DAC chip as shielding it. Just get some copper shielding and fit it over the entire DAC board and all its chips. Run a wire from that shield to a ground plane and you've got it covered.
In effect you are creating a partial Faraday cage. If you bend the edges of the foil downward you can shield even more.
Enjoy,
Bob
In effect you are creating a partial Faraday cage. If you bend the edges of the foil downward you can shield even more.
Enjoy,
Bob