OP AMP Voltage Buffer/Distributor

[adamey]

I have a voltage signal of 0-5V that I wish to split up and send to multiple circuits (max of 4). I want to keep these circuits isolated so that if there's a problem with one of them that they won't interfere with the voltage to the other circuits. The frequency is low (<100Hz). I want to make sure the voltage difference between each output is as small as possible (perhaps 10mV). The operating temp of this circuit would be from around 30F to 100F and I don't want the voltage to change because of temperature.

Is it really just as easy as having a simple non-inverting op-amp set up as a voltage follower and having all the inputs tied together? What would you recommend as a good op-amp

Sorry for the simple question, I'm more of a digital guy.

 

[ericgibbs]

hi,
What is the input impedance of the '4 circuits'.?

 

[adamey]

^ Don't know but I assume it's high. The inputs go to PIC microcontrollers for ADC.

 

[Dx3]

A quad op-amp seems to be the right thing to do, but keeping the results within .01 volts will probably require small adjusting potentiometers. There are op-amps guaranteed tighter than .01 volts, but I think that will require 4 seperate chips. I'll go look.

 

[Dx3]

Mouser 512-LM224N quad op-amp 5 millivolts 26 cents.