> I've been using some US Sensors parts for high accuracy 
> and
> interchangability (0.1c) applications recently with great 
> success.

> These puppies cost about USD5.0. But your specs can be 
> done for about
> a buck; including the passives. :)

"Within a few degrees" over a 160 C range with no 
calibration may be pushing things for some values of few.

The delta-I diode method is liable to also be realisable for 
rather less than a dollar for all processor external parts 
and to produce an uncalibrated  accuracy of substantially 
less than 1 degree C. Accuracy is liable to be limited by 
how accurately you can control the current delta and measure 
the resultant voltage delta. With a 10 bit ADC that's not 
liable to be too hard.


        Russell




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