Issue with INA212

Ramakrishna Challa

Prodigy 160 points

Other Parts Discussed in Thread: INA212

0268.INA212_simulation.TSC - TINA.pdfAll,

In one of my application I am using INA212 for bi-directional current sensing purpose.

It is not showing linear relation between input current and output voltage. It is showing some shift of output voltage.

current range :-20mA to 20mA

Please provide your suggetion regarding this design.

7610.TINA Diagram1.pdf

Regards

Ram

over 13 years ago

0 Pete%20Semig over 13 years ago

TI__Mastermind 25805 points

Hello Ram,

After looking at your simulation schematic, I am unsure of how you’re using VG1 and VG2. Therefore I have provided the attached TINA simulation.

In the simulation I use V2 to set the common-mode voltage. IS1 is used to simulate your load (-20mA to 20mA). The rest of the circuit is the same as yours.

Performing a DC sweep of IS1 from -20mA to 20mA, you will see proper operation.

ina212_tina-ti_reference_design.tsc

0 Neil Albaugh over 13 years ago in reply to Pete%20Semig

Genius 5430 points

Pete;

To verify that this was not a bandwidth problem, I replaced your DC curent source woth a square wave current generator set to +/-20mA @ 1kHz.

My results were the same as yours-- the circuit works just fine.

INA212 Bipolar Current Monitor.TSC

0 Pete%20Semig over 13 years ago in reply to Neil Albaugh

TI__Mastermind 25805 points

Thanks Neil!

Amplifiers

Amplifiers forum

Issue with INA212