I am looking for the same design, have you found anything yet? If you like you can check here for ready made circuits:
AD421 from analog
and **broken link removed**
I have seen these ICs from burr brown and analog device,... and worked with these ICs,but I want to design a professional process calibrator that power,size,performance,accuracy are most important.
these designs and sample circuits are very simple and is for learning how to work with these ICs.