>> http://www.piclist.com/techref/microchip/aout.htm
>>
>> Something like that ?
> 
> That is a very nice circuit I may be able to use.

Here's an implementation of it I use

http://home.clear.net.nz/pages/joecolquitt/0-10mA_remote_lm335.gif

It includes a -.2.73V offset (0degC = 0V) and X10 => 100mV/degC

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