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Tranki what range of temperature are you going to measure? Room temperature? Outdoor temperature? Hot water? Sub zero?
Some components and design perform differently or not at all if they use components that cannot cope with the temperature range you need the circuit for. Since you are looking for a very thight accuracy, you have to consider the rest of the circuit as well, not just the measuring sensor. Resistors change their value with temperature, as do capacitors. But this is not widely recognised by all designers.
Aare you also going to measure the temperature with a seperate probe, or do you want to use the component (i.e. LM35) as the probe? All these factors are important in your final design.
Well, I need measure air conditioned installations.
The range of temperatures is about -30ºC to +40ºC. The reason of precission is the problem. I find many information on IC's and schematic circuits for temperature measure, but I need a precision of 0.2ºC because the system uses diferential temperature between ambient and flow air conditioned temperature.