I've never heard of anything like that. Are you trying to minimize PCB space usage? If you tell us more about what you are trying to do we can help you come up with a solution.
I'm designing a device which records 3 second of audio onto some SRAM and uses a PLD as the controller, but at any one time, either the ADC or DAC will be used ie there is no state on the state machine where both ADC and DAC are used at the same time. So i was thinking of minimising components by using a chip which does both. It's a guitar riff sampler-thing.
I've been looking for a combo ADC/DAC IC but can't find one! :cry:
Looked at the ISD2560 datasheet, excellent single-chip solution for this design. The thing is, my design is for a final year project at my uni and should demonstrate some low level design like PLD programming. I'm doing this at 12-bits and 40khz sampling frequency.