I need to measure voltage between 0-10 volts using my Arduino Due. I have an ADS7805p chip, which I believe will work, but am not sure how to wire it on my breadboard. I'm used to just using the chip on the arduino, but that only goes 0-5 volts and I can't loose the resolution by converting. Can someone, please, point me to or instruct me on how to wire something like this to my arduino?
The ADS7805 is old but still a pretty good ADC. I could imagine that you just have a few lying around that you want to use. I would simply wire it to two parallel in / serial out chips like the 74HC589 or CD4021 as used in this example:
Start the conversion as described in Duncan C's answer and then simply clock in all 16 bits. I think you could then probably get away with 4 or 5 control lines.
If you really need 16 bits of resolution then you could use that chip, but it's going to be a lot of work. Also beware that according to Mouser's website, it is not recommended for new applications. It sounds like it's being phased out/replaced.
Take a look at the data sheet linked from Mouser's website: ADS7805p datasheet
It has 16 bits of parallel data output, plus what sounds like 2 control lines, CS and R/(not)C (Don't know how to make the proper symbol.)
It sounds like you pull CS and R/C low to trigger a conversion, then wait for not busy to go low, switch R/C to high, then read the 16 bits of data.
To use this chip you're going to need 18 or 19 pins from your Arduino. You might want to consider a chip with a serial interface instead.