I am looking for temperature sensor with +/- 0.5 degree accuracy at 25 degrees. The DS18B20 would do the job well, but does not work over the range of 1.8V to 3.6V. Other type such as the DS75LV, and LM94022 are not accurate enough. Digital output is preferred, but can work with analogue output. The sensor is to be built into a probe with a 2 meter connecting lead. Thank you for any suggestions.