INA282AIDR Series

series introduction

# INA282AIDR Product Series Introduction

## 1. Overview
The INA282AIDR belongs to a high - performance series of current - sensing amplifiers developed by Texas Instruments. These devices are engineered to accurately measure current in a wide range of applications, offering a combination of precision, flexibility, and ease of use. The "INA" in the part number typically stands for Instrumentation Amplifier, which is a type of differential amplifier with high input impedance, high common - mode rejection ratio (CMRR), and low output offset voltage, making it ideal for current - sensing tasks.

## 2. Key Features

### 2.1 High Precision
- **Low Offset Voltage**: The INA282AIDR has a very low input offset voltage. This low offset is crucial in current - sensing applications because it directly affects the accuracy of the current measurement. Even small offset voltages can introduce significant errors, especially when measuring small currents. For example, in a battery - powered device where the current draw might be in the milliampere or even microampere range, a low offset voltage ensures that the measured current value is as close to the actual value as possible.
- **High Gain Accuracy**: It offers high gain accuracy, which means that the output voltage of the amplifier is a precise multiple of the input voltage (related to the sensed current). This accuracy is maintained over a wide temperature range, ensuring reliable performance in various environmental conditions.

### 2.2 Wide Input Common - Mode Voltage Range
- The device can handle a wide range of input common - mode voltages. This is important in applications where the voltage across the current - sensing resistor (shunt resistor) is superimposed on a relatively high DC voltage. For instance, in automotive electrical systems, the battery voltage can be around 12V or 24V, and the INA282AIDR can accurately measure the current flowing through a shunt resistor while being able to tolerate the high common - mode voltage of the battery.

### 2.3 Low Power Consumption
- With its low power consumption design, the INA282AIDR is suitable for battery - powered applications. In portable devices such as smartphones, tablets, and wearable devices, minimizing power consumption is essential to extend battery life. The low quiescent current of the amplifier ensures that it does not draw excessive power from the battery, making it an energy - efficient choice for current - sensing tasks.

### 2.4 Fast Response Time
- It has a fast response time, which allows it to quickly detect changes in the sensed current. This is beneficial in applications where rapid current changes occur, such as in switching power supplies or motor control circuits. The fast response time enables the system to respond promptly to changes in load current, improving the overall performance and stability of the system.

## 3. Functional Block Diagram and Working Principle

### 3.1 Block Diagram
The INA282AIDR consists of an input stage, a gain - setting stage, and an output stage. The input stage is designed to have high input impedance to minimize the loading effect on the shunt resistor. The gain - setting stage allows the user to adjust the gain of the amplifier according to the specific requirements of the application. The output stage provides a single - ended output voltage that is proportional to the differential voltage across the shunt resistor.

### 3.2 Working Principle
When a current flows through the shunt resistor, a small voltage drop is generated across it. The INA282AIDR amplifies this differential voltage. The gain of the amplifier is determined by an internal resistor network or can be adjusted using external resistors in some configurations. The amplified output voltage can then be measured by an analog - to - digital converter (ADC) or used for other control purposes in the

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INA282AIDR