LM 34 PGA/ ADC Settings

[Anonymous]

Hello,

       

I have a few LM34 temperture ICs to play with, the IC puts out an analog voltage proportional to the ambient temperture.

   

1mv per degree F So 78 degree will be 78mv.  Any thoughts on seting up the PGA and what the best ADC would be to choose?

   

Thanks,

       

Alan

[ETRO_SSN583 · Accepted solution]

The LM34 puts out 10 mV / F.

       

[Anonymous]

Thanks for straighting me out on the mv! I have not used this chip for a while. Any thoughts on the PGA set up and best ADC choice?

       

Alan

[ETRO_SSN583]

I would set in global properties the OpAmp power to high,

   

to insure CM range is as large as possible. Note PGA is

   

not R-R on input or output. I would just set G = 1.

       

Better yet use no PGA and feed the A/D directly from the

   

pin.

       

Regards, Dana.

[Anonymous]

Thanks!  Kinda funny feeding the output directly into the ADC is what I would do with the ATMEL part and I was thinking the PGA might be handy for what I am doing. I have no rational reasoning for that thought.

       

Thanks,

       

Alan