thanks berkeman, i found them but those are just examples of adc i would still search for the dac's also chroot thanks for the list but can u place Delta, Sigma Pipeline, Folded Pipeline in their categories?
ebebest, I think what we are trying to do is give you a few keywords so that you can do a little google searching for yourself to answer your own homework question. That is a skill that you will need to develop in your schoolwork. Try googling the terms that chroot has given you, and put them in the categories yourself...
Also, another way to approach the question is to go to a manufacturer of ADC and DAC components, and look for selector guides and application notes, and check out a few datasheets. Here is one example of such a manufacturer: