Overview
The INA281A1IDBVR, produced by Texas Instruments, is a high-precision current-sense amplifier designed for a wide range of applications requiring accurate and high-speed current measurement. This device operates over a broad common-mode voltage range from -4 V to 110 V, making it suitable for both low- and high-side current sensing. The INA281A1IDBVR features a precision zero-drift topology, excellent common-mode rejection ratio (CMRR), and high bandwidth, ensuring highly accurate current measurements even in high-frequency applications.
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 | ±100 µV | ±55 µV | ±500 µV | µV |
| Offset drift | ±0.1 µV/°C | ±1 µV/°C | µV/°C | |
| Gain (INA281A1) | 20 V/V | V/V | ||
| Bandwidth | 1.3 MHz | MHz | ||
| Slew rate | 2.5 V/µs | V/µs | ||
| Quiescent current | 1.5 mA | 2 mA | mA | |
| Supply voltage | 2.7 V | 20 V | V |
Key Features
- Wide Common-Mode Voltage Range: Operates from -4 V to 110 V, allowing for both low- and high-side current sensing.
- Excellent CMRR: 120 dB DC CMRR and 65 dB AC CMRR at 50 kHz for high accuracy in noisy environments.
- Precision Zero-Drift Topology: Low offset voltage (±55 µV typical) and low offset drift (±0.1 µV/°C typical) ensure accurate measurements.
- High Bandwidth and Slew Rate: 1.3 MHz bandwidth and 2.5 V/µs slew rate for fast response and high-speed applications.
- Multiple Gain Options: Available in gains of 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V to optimize output dynamic range.
- Low Input Bias Current: Typical input bias current of 20 µA at high common-mode voltages.
- Wide Supply Range: Operates from 2.7 V to 20 V, supporting a wide range of system power supplies.
Applications
- Active Antenna System mMIMO (AAS): For precise current measurement in advanced antenna systems.
- Macro Remote Radio Unit (RRU): Suitable for high-precision current sensing in telecom equipment.
- 48-V Rack Server and Merchant Network & Server Power Supply (PSU): Ideal for current monitoring in high-power server systems.
- Solenoid and Valve Control: For accurate current measurement in control systems.
- Telecom Equipment and Power Supplies: General use in various telecom and power supply applications requiring high-precision current sensing.
Q & A
- What is the common-mode voltage range of the INA281A1IDBVR?
The INA281A1IDBVR operates over a common-mode voltage range from -4 V to 110 V.
- What are the available gain options for the INA281A1IDBVR?
The device is available in gains of 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
- What is the bandwidth of the INA281A1IDBVR?
The bandwidth is 1.3 MHz for the INA281A1IDBVR.
- What is the slew rate of the INA281A1IDBVR?
The slew rate is 2.5 V/µs.
- What is the typical offset voltage of the INA281A1IDBVR?
The typical offset voltage is ±55 µV.
- What is the quiescent current of the INA281A1IDBVR?
The quiescent current is 1.5 mA.
- What is the supply voltage range for the INA281A1IDBVR?
The device operates from a supply voltage of 2.7 V to 20 V.
- What are some typical applications of the INA281A1IDBVR?
Typical applications include active antenna systems, macro remote radio units, 48-V rack servers, solenoid and valve control, and various telecom and power supply systems.
- How does the INA281A1IDBVR handle high-frequency current measurements?
The device features high bandwidth and a fast slew rate, making it suitable for high-frequency current measurements and fast overcurrent protection.
- What is the significance of the zero-drift topology in the INA281A1IDBVR?
The zero-drift topology ensures low offset voltage and low offset drift, which are crucial for accurate current measurements across a wide operating temperature range.
