I want to measure the air temperature with the ADT310. I have mounted three sensors in three different PCBs, and the digital value returned by the sensors is usually 3 or more celsius degrees off than the actual temperature. What's the typical usage of this sensor? Do I have to attach the top of the package to the surface I want to measure?
I read a post here that having a properly power regulators can affect measurements, but this seems not to be my case, since the sensor is powered by a 3.3V LDO (powered by a 5V switching power supply), and has a proper 0.1uF decoup cap near VCC and GND pins. Seems that I have to take into account thermal impedance of the package? Or any other suggestions?