Overview
The INA281A2IDBVR is a high-precision current-sense amplifier produced by Texas Instruments. It is part of the INA281 family, designed to measure voltage drops across shunt resistors over a wide common-mode range from –4 V to 110 V. This device is particularly useful for applications requiring precise current measurement, including those with high-speed requirements such as fast overcurrent protection. The INA281A2IDBVR operates on a single supply voltage ranging from 2.7 V to 20 V and features a precision zero-drift topology, ensuring low offset voltage and high common-mode rejection ratio (CMRR).
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Common-mode input range | –4 | 110 | V | |
| CMRR (DC) | 120 | 140 | dB | |
| CMRR (AC at 50 kHz) | 65 | dB | ||
| Gain error | ±0.07% | ±0.5% | % | |
| Gain drift | ±2 ppm/°C | ±20 ppm/°C | ppm/°C | |
| Offset voltage | ±55 µV | ±300 µV | µV | |
| Offset drift | ±0.1 µV/°C | ±1 µV/°C | µV/°C | |
| Gain (INA281A2) | 50 V/V | V/V | ||
| Bandwidth | 1.3 MHz | MHz | ||
| Slew rate | 2.5 V/µs | V/µs | ||
| Quiescent current | 1.5 mA | 2 mA | 2.25 mA | mA |
| Supply voltage | 2.7 V | 20 V | V |
Key Features
- Wide Common-Mode Range: Operational voltage from –4 V to 110 V and survival voltage from –20 V to 120 V.
- High CMRR: 120-dB DC CMRR and 65-dB AC CMRR at 50 kHz.
- Precision Zero-Drift Topology: Low offset voltage (±55 µV typical) and low offset drift (±0.1 µV/°C typical).
- Multiple Gain Options: Available gains include 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
- High Bandwidth and Slew Rate: 1.3 MHz bandwidth and 2.5 V/µs slew rate, suitable for high-speed applications.
- Low Input Bias Current: Typical input bias current of 20 µA at a common-mode voltage of up to 110 V.
- Wide Supply Range: Operates from a single supply voltage of 2.7 V to 20 V.
Applications
- Active Antenna System (AAS) and mMIMO (Massive MIMO): For precise current measurement in wireless communication systems.
- Macro Remote Radio Unit (RRU): Used in telecommunications infrastructure for accurate current sensing.
- 48-V Rack Server and Merchant Network & Server Power Supply (PSU): Suitable for high-current measurement in data center and server applications.
- Solenoid and Valve Control: For precise control and monitoring in industrial automation.
- Telecom Equipment and Power Supplies: General use in telecommunications and power supply systems requiring high accuracy current measurement).
Q & A
- What is the common-mode input range of the INA281A2IDBVR?
The common-mode input range is from –4 V to 110 V).
- What is the CMRR of the INA281A2IDBVR?
The device has a 120-dB DC CMRR and a 65-dB AC CMRR at 50 kHz).
- What are the available gain options for the INA281 family?
The available gains are 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V).
- What is the bandwidth of the INA281A2IDBVR?
The bandwidth is 1.3 MHz).
- What is the slew rate of the INA281A2IDBVR?
The slew rate is 2.5 V/µs).
- What is the quiescent current of the INA281A2IDBVR?
The quiescent current is typically 1.5 mA, with a maximum of 2.25 mA).
- What is the supply voltage range for the INA281A2IDBVR?
The device operates from a single supply voltage of 2.7 V to 20 V).
- What are some typical applications of the INA281A2IDBVR?
Applications include active antenna systems, macro remote radio units, 48-V rack servers, solenoid and valve control, and telecom equipment).
- How does the INA281A2IDBVR handle high-speed current measurement?
The device is designed for high-speed applications with a high bandwidth and fast slew rate, making it suitable for detecting fast inrush currents).
- What is the significance of the zero-drift topology in the INA281A2IDBVR?
The zero-drift topology ensures low offset voltage and low offset drift, enabling accurate current measurement across a wide operating temperature range).
