Signal conditioning Op Amp choice

[flash23]

I need to connect an RTD to 0804ADC for signal conditioning i need to obtain a gain of 69.1
Here are further details
ip to op-amp 0V to 72.35V
op req 0 to 5V
I think Opamp 741 will not be satisfactory in this case but TLV 2471 will do .
What i really want is which Opamp should i use? either above or any other

 

[john blue]

Rail to rail op-amp

 

[flash23]

rail to rail means TLV 2741 but what are the advantages of it over the 741

 

[RCinFLA]

Normally for an op amp to drive an ADC you look for low DC offset, low drift over temp, and low noise. A 741 is about as bad as they come for these specs. An ADC0804 being only an 8 bit ADC noise performance is not that important unless going with a lot of gain in front of ADC.

With a gain of 69.1 you need to pay attention to op amp DC offset drift. It is desirable to keep drift to less then 1/16 to 1/8 of 1 bit resolution.

The ADC0804 is going to be about 17-18 mV per step so its ADC input DC drift should be less then 1 or 2 mV dc. A standard op amp will have a worse case 1 mV input offset. Gain that up and you have a significant offset to null out at ADC calibration. Then you need op amp not to drift its offset versus temp.