7 Detailed Description

7.1 Overview

The INAx126 use only two, rather than three, operational amplifiers, providing savings in power consumption.

In addition, the input resistance is high and balanced, thus permitting the signal source to have an unbalanced

output impedance.

A minimum circuit gain of 5 permits an adequate dc common-mode input range, as well as sufficient bandwidth

for most applications.

7.2 Functional Block Diagram

+

+

REF

–IN

+IN

OUT

RG (Optional)

7.3 Feature Description

The INAx126 are low-power, general-purpose instrumentation amplifiers offering excellent accuracy. The

versatile two-operational-amplifier design and small size make the amplifiers an excellent choice for a wide

range of applications. The two-op-amp topology reduces power consumption. A single external resistor sets any

gain from 5 to 10,000. These devices operate with power supplies as low as ±1.35 V, and a quiescent current of

200 μA maximum.

7.4 Device Functional Modes

7.4.1 Single-Supply Operation

The INAx126 can be used on single power supplies from 2.7 V to 36 V. Use the output REF pin to level shift

the internal output voltage into a linear operating condition. Ideally, connect the REF pin to a potential that is

midsupply to avoid saturating the output of the amplifiers. See Section 8.1 for information on how to adequately

drive the reference pin.

INA126, INA2126

SBOS062C – SEPTEMBER 2000 – REVISED JANUARY 2022

www.ti.com

12

Submit Document Feedback

Copyright © 2022 Texas Instruments Incorporated

Product Folder Links: INA126 INA2126