I've been looking over the datasheet on this, but haven't found a definite answer to your question. I suggest looking at this thread as it may provide some useful information for you: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1224321879
i have gone through that thread...it speaks about minus temperatures ...
might be useful if i solve the following issue
my problem is like the ADC in the sanguino board which even with a potentiometer shows random values
How do you have your potentiometer connected? You should have one end tied to ground, the other to +5V and the wiper should be tied to your analog input. Let's start there and work from that. I think once you have some confidence that you're reading what you expect to read, then you can move on to the sensor.