Hi guys,

Is it possible for the INA 129 instrumentation amplifier to work on 0-12V power supply?

 

I would say yes. looks like 4.5 volts minimum and 36 volts max.
link for specs

 

You may check it out. But I do not know if the over-voltage protection will work. If it is any help I know Linear Tech. have Single Supply Instrumentation Amplifiers. Go to http://www.linear.com/ and search for "Supply Instrumentation Amplifier"

 

It will work, as long as the relative voltage differences between different pins is the same as in Fig 1 of the datasheet. However, there is a good reason why this is a a dual supply IC. Vref (pin 5) has to be connected to a low impedance point, otherwise the CMRR will be severely impacted. A ground connection assures close to zero ohm impedance.

So, you can set Vref somewhere inside the 0-12V range and make sure you feed that point from a low output impedance buffer. You will have some CMRR degradation, as the buffer cannot have zero output impedance, but should not be severe. The signals will be referred to Vref (output signal, load, input signal).

 

It will amplify only positive signals so I can connect Vref to ground.

Is that right?

 

Yes I think so. But remember the common mode range specification. You may perhaps see some minor degradation compered to the data sheet specs. But this may not be important at all for your application

 

It will amplify only positive signals so I can connect Vref to ground.

Is that right?

For a positive signal chain try the following: Connect your signal to pins 3 and 2, with the ground on pin 2. Pin 4 and 5 to ground. You should see your signal at the output. However, A1 output cannot go exactly to zero, because it does not have a negative supply. Your positive signal at pin 6 will be chopped off by 0.6V to 0.9V, because it will be pushed by A1 below ground. Some positive DC voltage on top of your signal should correct this.