ADC0804 interfaced with CPLD

The ADC0804 is a pretty slow ADC (100us conversion time). Its basically designed for measuring DC values.

From a brief look at the data sheet

http://www.ti.com/product/adc0804

It says you can treated the interface like a microprocessor I/O device. The timing diagrams show that the read/write interface is essentially asynchronous, you just have to assert the signals for as long as the data sheet indicates - based on how you clock the thing. Since the clock is so slow and the ADC dynamic range is only 8-bits (so clock jitter is not so important), you can generate the clock using the CPLD.

Do you have a board that already contains the part, or are you just creating a proto-board interface?

Cheers,

Dave