Thanks ogden,
I checked out the datasheet and the part on Digikey.
I guess what I'm looking for is more of a "why" this part number? This circuit is for 0-3V input, but if I want to adapt for 0-5V reading I'm not sure what I'm looking for in the parameters on Digikey to do so, or what else to modify in the circuit based on my conditions.
I will have a 24VDC supply for the SCADA modem and a 5VDC supply available for the sensors.
Also, the complexity of this circuit is greater than the original one I posted. Is this for greater precision? I should mention that my application is not for precision instrumentation, so I'm not sure if that changes anything. I am fine with some reasonable amount of error.
I will keep searching for an explanation in the meantime, but if anyone knows of a good link to understand how to go about choosing the components to do something like this it would really help further my understanding.
Thanks!