I'm trying to pick the correct amplifier for the following circuit:
Rref is 1 ohm, Vref is ground, and RL is anywhere between 0-30 ohm which voult mean that Vout would have to be around 30ohm *250mA at max. The D/A converter will input 0-250 mV. The DAC I am using is the MCP4921 and it works really well.
However, I tried using the LT1206 as an amplifier, and it didn't work so well. I have a stable 12V supply to the amplifier but I am unable to get the amplifier to work.
Any suggestions or other recommendations for amplifiers?
Using this circuit, I am unable to get V+ = V-. I've tried to implement a voltage follower circuit as well to test the amplifier, setting V+ to 5V, and I would achieve a 4.4V at V- when the supply is turned off and a 10.6 V when they supply is turned on. Again, doesn't make sense to me.
The goal of the circuit is to control the current accross the load to vary between 0-250 mA by using the DAC. Also, The output of the DAC is a DC voltage.
Datasheet for LT1206: https://www.analog.com/media/en/technical-documentation/data-sheets/1206fb.pdf