Bias temperature sensor?

[mphotis]

Can anyone please tell me how to bias an lm35 temperature sensor to work in the range of -10 to +50 celsius?
Thanx

 

[audioguru2]

Hi Mphotis,
The circuit is on the 1st page of its datasheet. http://www.national.com/ds.cgi/LM/LM35.pdf
If you need a different output voltage range or offset voltage, use an opamp on its output.  ;D

View attachment 36795

 

[mphotis]

okay, thanx but now im working with a 5volt rail, how am i gonna get a -5V for    -Vs? im sorry, im pretty bad at this.

 

[audioguru2]

Hi Mphotis,
Connect it like this. Do you have a differential input to feed its outputs to?

View attachment 36800

 

[MP1]

You do not need a negative supply. All you need to do is float the ground pin on the temperature chip. Connect a couple of 1N914 diodes between the LM35 ground pin and ground. Then