Hennie Swanepoel wrote:

>  I was hoping that someone had come around to designing
> IC's dedicated to current/voltage and voltage/current conversion.

Analog Devices has a series of IC's that handle this. I personally like
their stuff better than Burr Brown's. Poke around on the AD (
http://www.analog.com/ ) web site and look for the sensors & sensor
interfaces page. They have a nifty 4-20 or 0-20 ma serial dac, and I
know they used to have some isolation amps that handle current loop
inputs.

Somebody out there also has some loop powered isolation amps, but I
can't put my finger on who just now.

--Tom Rogers  VP-R&D  Time Tech Inc.