Well then look at the commercial sigma-delta codec units giving you both ADC and DAC capabilities, I have given one such example that I use above, but you could look at others from the same manufaturer, Cirrus Inc.Thanks for all the help. I really appreciate it guys. In case you guys were wondering I ask this because I'm in a design class (Cal Poly SLO), and we are designing a satellite system around the moon to give 24/7 communication (video quality). One of my jobs right now is to figure out what kind of ADC we're going to use on the satellites.
Again, thanks for the help guys.