TINA/Spice/INA199-Q1: Bidirectional Operation in TINA

Jared Becker

Part Number: INA199-Q1
Other Parts Discussed in Thread: TINA-TI, , INA199

Tool/software: TINA-TI or Spice Models

Hi Team,

I am simulating the INA199-Q1 in TINA, and I am trying to use it in a bidirectional manner. In section 9.2.2 of the INA199-Q1 datasheet, it shows how this part can be used in that type of setup and what to expect at the output.

However, when I run my simulation, there seems to be some clipping when the current goes negative:

INA199-Q1 Ref Config.TSC

If you can help me achieve correct bidirectional operation in TINA, that would be greatly appreciated!

Thank you,

Jared

over 6 years ago

0 Herman Theodorus over 6 years ago

TI__Genius 9775 points

Hi Jared,

One of our team member will take a look at this.

Herman

0 John Miller - Sensing over 6 years ago in reply to Herman Theodorus

TI__Mastermind 35685 points

Jared,

Your circuit has an input common-mode range that varies between -4V and +4V.
The problem is the INA199A1/2/3 family is rated for an input common-mode of -0.3V to 26V with a 5V supply.

If you add a DC offset to the signal source so the minimum input common-mode voltage is -0.3V with your signal, the clipping goes away.
A modified version of your original circuit with this rev is attached.

Regards,
John

INA199-Q1 Ref Config_revd.TSC

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TINA/Spice/INA199-Q1: Bidirectional Operation in TINA