The problem si the minim value! 0,55 V
Hi, looking at http://www.analog.com/media/en/technical-documentation/data-sheets/AD694.pdfAnother problem you might have is that it looks like it takes either 0-2 or 0-10 V, not 0-2.5V. But again, as James said, simply do not output the maximum value from the Due. As far as the minimum value goes, it looks like you can adjust the input buffer (look at pins 15 & 16, there is an ADJ and Voffset). Maybe someone more knowledgeable can explain further, but I think that's what you are looking for.
If you need a current output, you're pretty much going to need an external op-amp to do voltage-to-current conversion. That same op-amp can compensate for the goofy offset and range of the Due DAC, as well as scaling the output to give the range you want. You won't get a passive circuit to give you what you need.Regards,Ray L.
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