I need to buffer a 0-5V signal that is coming from a resistor network and being fed into an IC. When I feed it directly to the IC there is a loading effect and the value is changed specifically at 0V input the IC will source current out the input pin and produce a ~0.3V value.
My first thought was to use an Op Amp as a voltage follower. I have a TI-082 available and tried to use. I have a +24V and +5V sources available and using a single 24V supply for the op-amp works great for values from ~1.5-5V but anything under that and the output swings to the 24V supply voltage. I understand this is due to getting to close to the negative rail.
I next set up a +/-12V supply from my 24V source and everything in the 0-5V range was properly buffered, but the problem was I could no longer input it to the intended IC since the IC is powered by 24V and GND and the input is references to GND so to the IC the 0-5V was appearing as 12-17V.
Is there a way to make the op-amp go to 0V when hitting the negative rail? Forcing the bottom 1.5V to GND would be acceptable but output 24V is not. Alternatively, is there anyway to configure the +/-12V configuration to work despite the input being referenced to what would be the -12V line from the op-amp's perspective?