INA826: Use as a differential amplifier for 5V

Xiaoling Li77

Part Number: INA826

We have a design needing a differential amplifier for 5V diff in and 5V output, we chose INA826. But with "Common-Mode Input Range Calculator for Instrumentation Amplifiers", input 5V diff may make the INA826 working in margin area (Vin+ is around 5V, Vin- is around 0V, Vin diff is 5V, and then Vout is 5V). So is there any risk to use this amplifier for our purpose? Thanks.

over 6 years ago

0 Tamara M Alani over 6 years ago

TI__Genius 10850 points

Hi Xialing,

Thanks for your post.

Few questions: What is the supply voltage? It's suggested to set the common-mode voltage to mid-supply. What is your Vref?

We have a TINA reference design of this device that you can use to simulate your circuit here: http://www.ti.com/lit/tsc/sbom471

-Tamara Alani

0 Xiaoling Li77 over 6 years ago in reply to Tamara M Alani

Prodigy 70 points

Vs+ is 12V, Vs- and Vref are ground. Thank you.

0 Tamara M Alani over 6 years ago in reply to Xiaoling Li77

TI__Genius 10850 points

Hi Xiaoling,

The Vcm v Vout calculator is reliable. Given your conditions, you can have an input of 100mV to 5V and get an output of 100mV to 5V. The calculator takes into account input/output limitations of the amplifier.

-Tamara

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INA826: Use as a differential amplifier for 5V