INA333: Does INA333 suitable for uV level signal amplify

user4090349

Intellectual 941 points

Part Number: INA333

Hello

The input signal is about 20uV RMS(50Hz), I would like to use INA333 for 300 times amplify.

How to consider this application？like noise, etc?

Thanks and Best Regards

over 5 years ago

0 Tamara M Alani over 5 years ago

TI__Genius 10850 points

Hi,

Thanks for your post, I can help you. This will depend on a few parameters, including supply, reference voltage and common mode voltage.

Assuming 20uV RMS input (120uV p-p), on a +/-2.5V supply, with ref set to ground, VCM = 0, and gain = 300V/V, you can linearly process an input differential range between -7.33mV to +7.33mV. Please see the VCM vs Vout plot below. This boundary plot allows you to change all the configurable features of an instrumentation amplifier and quickly determine linear design. You can find this tool in the Analog Engineer's Calculator here: https://www.ti.com/tool/ANALOG-ENGINEER-CALC

Once you have downloaded the calculator, click on "Amplifier & Comparators" -> "INA VCM vs VOUT. Select the INA333 in the part number drop-down menu and enter your supply, reference voltage, gain and common mode voltage. The graphs on the right will show you linear operating ranges.