16 channel 12 bit A/D converter with a serial output. I don't have the part number off the top of my head, but I know they exist...and surely they're a LOT easier to use than that MAX133. Search Digikey, Mouser, whatever, they're out there...
And make it easy on yourself, learn PBP (the long way, not the short way), take a PIC18F4620 (13 channels of A/D), read the voltages (which need to be divided down using a simple voltage divider resistor network, in fact, just divide everything by 3 to make it easy), preconvert the numbers in the PIC if neccessary (i.e. if you want the output to read something like 4v, 3v, whatever) and send the data out serially on another pin.
And I don't see why this would be so complicated that you couldn't just integrate this into your main project rather than have it on another chip entirely...
All done very easily in PBP
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