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Originally Posted by Incoherent
Hi dnkroz
Thanks for the suggestion, I have considered it. The only problem with the LM35 type sensors is their size and shape. I want to insert the sensor into a small (~1mm) hole. Thermistors are available in a very small package.
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A few points that may/may not be useful:
You mention accuracy is important, the MAX186's internal reference depending on version can be as bad as +/- 80ppm. If using this chip ensure you get the best version. Much better external references are available.
Incorporating switchable gain instrumentation amplifiers into the design will allow various ranges to be monitored at better resolution.
Linearisation has to be incorporated in the software to handle the thermistor, if working over a shortish range then dependant on accuracy you are trying to achieve a small PRT, could be used which is almost linear over limited ranges.
Consider setting up a small current source (100uA) for powering of sensors, PRT, thermistors or as a resistor measuring device.
Hope this helps.