The AD590 is a temprature sensor. It has a linear current vs temperature change. The current that flows through it changes 1 micro ampere per kelvin. This means that at 0 degrees celsius the current is 273,2 uA. The AD590 has a specified temperature range of -55 to 150 C and a voltage range of 4V to 30V. The accuracy is +- 1,5°C.

Pinout:

   _---_           
  /     \        
 | o- Co |    
 |   +   |  
  \_ o _/      
    |_|       

The pin marked 'C' is connected to the case.

To use the AD590 with a milivolt meter or a multimeter set to mV this circuit can be used:


     ________________________ + 5v
  + |
    O AD590
    O
  - |____________________*_____o 
                         |     |
                        | |    | 
                    1k0 |_|   ( ) mV meter    
                         |     |  1 mV/K 
                         *-----o
                         |
                     GND -