> What about a source for a off the shelf 16 bit parallel DAC?

Analogue Devices AD1851, 669, 7846, 712

Burr-Brown DAC703 / 712

for starters

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Try here

http://www.embeddedlinks.com/chipdir/

"Other chips lists", local - by function > Digital To Analog Convertor

http://www.embeddedlinks.com/chipdir/f/dac.htm

"one or two" DACs here

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