INA132: INA132 about the design question

Mickey Zhang

Genius 12080 points

Part Number: INA132
Other Parts Discussed in Thread: OPA2191, INA826, INA126

Hi Team,

The customer would like to use the op amp to design his circuit. The input signal is 0~20mV and it is 100HZ.

After the signal is amplified by the op amp, the output voltage must be -10V to 10V.

My idea is the customer may use INA132 for the differential amplification.

First, the customer may give a 10mV reference voltage as the input voltage for INA132.

Then the output voltage for INA132 can be from -10mV to 10mV.

Finally, the -10mV~10mV voltage can be amplified 1000 times to reach -10V to 10V.

Q1: Is my idea correct?

Q2: If my idea is correct, is INA132 suitable for the customer's application?

When the -10mV~10mV voltage is needed to amplified 1000 times to reach -10V to 10V, which op amp can be suitable?

Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments

over 7 years ago

0 Errol Leon6 over 7 years ago

TI__Expert 5830 points

Hello Mickey,

I will look into this one for you.

Best,

Errol Leon
Texas Instruments
Precision Op Amp Applications

0 Errol Leon6 over 7 years ago

TI__Expert 5830 points

Hello Mickey,

You can not implement a gain of 1000v/v with the INA132. So if you were to use it you would need a gain stage after the INA132. Given the specifications I would recommend one of the following.

Recommendation 1: Use OPA2191 to level shift and gain. Example schematic of OPA2191 below.

Recommendation 2: Use either the INA126 or the INA826 to level shift and gain. Example schematic of INA826 below.

I have attached the TINATI files to this post. Let me know if you have any questions.

Best,

Errol

6114.INA826.TSC 10mV to +-10.TSC

0 Mickey Zhang over 7 years ago in reply to Errol Leon6

TI__Genius 12080 points

Hi Errol,

Thanks for your reply. But I cannot open the 6114.INA826 file.

0 Errol Leon6 over 7 years ago in reply to Mickey Zhang

TI__Expert 5830 points

INA826_V7.TSCSorry about that. I am uploading TINATI version 7 file. This should be able to open with any version of TINA that is 7 or higher. Let me know if you are able to open it.

Best,

Errol

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INA132: INA132 about the design question