Overview
The INA271AIDR from Texas Instruments is a voltage-output, current-sense amplifier designed for precise measurement of current through a shunt resistor. This device is part of the INA270 and INA271 family, which offers high accuracy and wide common-mode range, making it suitable for various applications including power management, automotive, telecom equipment, and more. The INA271AIDR operates from a single supply voltage of +2.7 V to +18 V and features a high common-mode rejection ratio (CMRR) of up to 120 dB. It is available in an SOIC-8 package and is specified over an extended operating temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Gain | 20 V/V | |
| Common-Mode Input Range | –16 V to +80 V | V |
| Supply Voltage | +2.7 V to +18 V | V |
| Quiescent Current | 700 μA (typ) | A |
| Bandwidth | Up to 130 kHz | Hz |
| Offset Voltage | ±0.5 mV (typ) | mV |
| Gain Error | ±0.2% (typ) | % |
| Output Impedance | 1.5 Ω | Ω |
| Operating Temperature Range | –40°C to +125°C | °C |
| Package Type | SOIC-8 |
Key Features
- Wide Common-Mode Range: The INA271AIDR can sense drops across shunt resistors at common-mode voltages from –16 V to +80 V, independent of the supply voltage.
- High Accuracy: Offers ±0.5-mV offset voltage and ±0.2% gain error, ensuring precise current measurements.
- High CMRR: Common-mode rejection ratio of up to 120 dB, providing excellent noise rejection.
- Provision for Filtering: The pinouts enable easy inclusion of filtering, such as single-pole or second-order Sallen-Key configurations, to remove unwanted transients and smooth the output voltage.
- Transient Protection: The device can withstand automotive fault conditions without additional protective components up to +80 V transients.
- Low Power Consumption: Operates with a quiescent current of 700 μA (typical), making it suitable for power-sensitive applications.
Applications
- Power Management: Ideal for monitoring current in power supplies, battery chargers, and other power management systems.
- Automotive: Suitable for automotive applications due to its ability to withstand high transient voltages and operate over a wide temperature range.
- Telecom Equipment: Used in telecom equipment for current sensing and monitoring.
- Notebook Computers and Cell Phones: Employed in portable electronics for efficient current monitoring.
- Welding Equipment: Used in welding equipment to monitor high currents accurately.
Q & A
- What is the gain of the INA271AIDR?
The gain of the INA271AIDR is 20 V/V.
- What is the common-mode input range of the INA271AIDR?
The common-mode input range is from –16 V to +80 V.
- What is the supply voltage range for the INA271AIDR?
The supply voltage range is from +2.7 V to +18 V.
- What is the typical quiescent current of the INA271AIDR?
The typical quiescent current is 700 μA.
- What is the bandwidth of the INA271AIDR?
The bandwidth is up to 130 kHz.
- How does the INA271AIDR handle transient voltages?
The device can withstand automotive fault conditions up to +80 V transients without additional protective components.
- What type of filtering can be implemented with the INA271AIDR?
The device supports single-pole and second-order Sallen-Key filtering configurations.
- What is the operating temperature range of the INA271AIDR?
The operating temperature range is from –40°C to +125°C.
- In what package is the INA271AIDR available?
The device is available in an SOIC-8 package.
- What are some common applications of the INA271AIDR?
Common applications include power management, automotive, telecom equipment, notebook computers, cell phones, and welding equipment.
