Hello,

I wanted to use a current shunt amplifier to measure the current through a circuit. I was thinking of getting the INA212 from TI because it has a Gain of 1000. The reason for this gain is because I want to be able to go down to nano-amps. I wanted to know what's the minimum voltage that the device can measure between the two pins because I want to get a Rs as small as possible. I want to be able to set a constant current or voltage so there is a feedback. Should I put the current sense on high side or low side? Suggestions?
Here's the link for the component.

http://www.ti.com/product/ina212

Thank you!

 

The its the resolution of the ADC that will determine your measurement resolution not the gain of the op amp. For example an 8 bit ADC can only have 256 (2^8) levels of measurement. While a 10 bit will give you 1024 levels.
You choose the gain based on the full scale voltage range of the ADC.

 

I'm using a 12 bit ADC and will go to 16 bit later which gives me 76uV per bit(based on a 5 volt scale). I know the issues about the resolution and I have considered them. My question was would the device or any regular instrumentation amp be sensitive enough to pick those minute voltage changes which in this case would be 76uV/1000=76nV, which would be the voltage drop across the shunt. I might use one with 10000 gain to go even lower.