Overview
The INA281B3IDBVR is a high-precision current-sense amplifier produced by Texas Instruments. It is part of the INA281 family, which offers a wide range of common-mode voltage operation from -4 V to 110 V, making it suitable for various high-side and low-side current-sensing applications. The device features a precision zero-drift topology, excellent common-mode rejection ratio (CMRR), and high bandwidth, making it ideal for accurate current measurement in demanding environments.
The INA281B3IDBVR operates from a single 2.7-V to 20-V supply and is designed with a transconductance architecture that includes a current-feedback amplifier. This architecture enables low bias currents and high performance across the entire valid VSENSE range, making it beneficial for applications requiring low current leakage and accurate measurement of low VSENSE levels.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Operational Voltage Range | -4 | - | 110 | V |
| Survival Voltage Range | -20 | - | 120 | V |
| Common-Mode Rejection Ratio (DC) | 120 | 140 | - | dB |
| Common-Mode Rejection Ratio (AC at 50 kHz) | 65 | - | - | dB |
| Gain (INA281B3) | 100 | - | - | V/V |
| Gain Error | - | - | ±0.5% | % |
| Gain Drift | - | - | ±20 ppm/°C | ppm/°C |
| Offset Voltage | - | ±30 µV | ±250 µV | µV |
| Offset Voltage Drift | - | ±0.1 µV/°C | ±1 µV/°C | µV/°C |
| Bandwidth | - | - | 1.3 MHz | MHz |
| Slew Rate | - | - | 2.5 V/µs | V/µs |
| Quiescent Current | 1.5 | - | 2 mA | mA |
| Supply Voltage Range | 2.7 | - | 20 | V |
Key Features
- Wide Common-Mode Voltage Range: Operational from -4 V to 110 V and survival up to -20 V to 120 V.
- Excellent CMRR: 120 dB DC CMRR and 65 dB AC CMRR at 50 kHz.
- Precision Zero-Drift Topology: Low offset voltage and low offset drift for accurate current measurement.
- High Bandwidth and Slew Rate: 1.3 MHz bandwidth and 2.5 V/µs slew rate for 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.
- Low Input Bias Current: Typical bias current of 20 µA at high common-mode voltages.
- Wide Operating Temperature Range: From -40 °C to 125 °C.
Applications
- Active Antenna Systems and mMIMO (AAS): For precise current measurement in advanced antenna systems.
- Macro Remote Radio Unit (RRU): In telecommunications infrastructure.
- 48-V Rack Server and Merchant Network & Server Power Supply (PSU): For high-efficiency power management.
- Solenoid and Valve Control: In industrial automation and control systems.
- Telecom Equipment and Power Supplies: For reliable and accurate current sensing.
Q & A
- What is the operational voltage range of the INA281B3IDBVR?
The INA281B3IDBVR operates from -4 V to 110 V.
- What is the common-mode rejection ratio (CMRR) of the INA281B3IDBVR?
The CMRR is 120 dB DC and 65 dB AC at 50 kHz.
- What are the available gain options for the INA281 family?
The gains available are 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
- What is the bandwidth of the INA281B3IDBVR?
The bandwidth is 1.3 MHz.
- What is the slew rate of the INA281B3IDBVR?
The slew rate is 2.5 V/µs.
- What is the quiescent current of the INA281B3IDBVR?
The quiescent current is 1.5 mA.
- What is the supply voltage range for the INA281B3IDBVR?
The supply voltage range is from 2.7 V to 20 V.
- What are some typical applications of the INA281B3IDBVR?
Typical applications include active antenna systems, macro remote radio units, 48-V rack servers, solenoid and valve control, and telecom equipment.
- How does the INA281B3IDBVR handle high common-mode voltages?
The device can operate with high common-mode voltages up to 110 V and has a low input bias current of 20 µA.
- What is the operating temperature range of the INA281B3IDBVR?
The operating temperature range is from -40 °C to 125 °C.
