7 Detailed Description

7.1 Overview

The INAx290 is a high-side only current-sense amplifier that offers a wide common-mode range, precision zero-

drift topology, excellent common-mode rejection ratio (CMRR), high bandwidth, and fast slew rate. Different gain

versions are available to optimize the output dynamic range based on the application. The INAx290 is designed

using a transconductance architecture with a current-feedback amplifier that enables low bias currents of 20 µA

and a common-mode voltage of 120 V.

7.2 Functional Block Diagram

SAR

ADC

IN+

IN±

OUT

+

±

Buffer

Current

Feedback

GND

RL

R1

R1

Bias

Load

INA290 (single channel)

INA2290 (dual channel)

www.ti.com

INA290, INA2290

SBOS961B – JUNE 2020 – REVISED DECEMBER 2020

Copyright © 2020 Texas Instruments Incorporated

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Product Folder Links: INA290 INA2290