Overview
The INA281B1IDBVR, produced by Texas Instruments, is a high-precision current-sense amplifier designed for a wide range of applications requiring accurate current measurement. This device operates over a broad common-mode voltage range from –4 V to 110 V, making it suitable for various high-voltage and high-current applications. The INA281B1IDBVR features a precision zero-drift topology, excellent common-mode rejection ratio (CMRR), and high bandwidth, making it ideal for both DC and high-speed current measurement tasks.
The device is available in multiple gain options, allowing system designers to optimize the output dynamic range based on their specific requirements. It operates from a single supply voltage ranging from 2.7 V to 20 V, supporting wide output ranges and low input offset voltages. This makes it particularly useful in systems that require precise measurement of recirculating currents in half-bridge applications and other high-precision current sensing scenarios.
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 | ||
| Offset voltage | ±55 | ±300 | µV | |
| Offset voltage drift | ±0.1 | ±1 | µV/°C | |
| Gain error | ±0.07% | ±0.5% | ||
| Gain drift | ±2 | ±20 | ppm/°C | |
| Bandwidth | 1.3 | MHz | ||
| Slew rate | 2.5 | V/µs | ||
| Quiescent current | 1.5 | 2 | mA | |
| Supply voltage | 2.7 | 20 | V | |
| Operating temperature | –55 | 150 | °C |
Key Features
- Wide Common-Mode Voltage Range: Operational voltage from –4 V to 110 V and survival voltage from –20 V to 120 V.
- Excellent CMRR: 120 dB DC CMRR and 65 dB AC CMRR at 50 kHz.
- Precision and Accuracy: Low offset voltage (±55 µV typical), low offset drift (±0.1 µV/°C typical), and gain error of ±0.5% maximum.
- High Bandwidth and Slew Rate: 1.3 MHz bandwidth and 2.5 V/µs slew rate, suitable for high-speed applications.
- Multiple Gain Options: Available gains of 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
- Low Input Bias Current: Typical input bias current of 20 µA at a common-mode voltage of 110 V.
- Wide Supply Range: Operates from a single supply voltage of 2.7 V to 20 V.
Applications
- Active Antenna System mMIMO (AAS): For precise current measurement in advanced antenna systems.
- Macro Remote Radio Unit (RRU): Suitable for high-voltage and high-current measurements in telecom infrastructure.
- 48-V Rack Server and Merchant Network & Server Power Supply (PSU): Ideal for current sensing in high-power server and data center applications.
- 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 INA281B1IDBVR?
The INA281B1IDBVR operates over a common-mode voltage range from –4 V to 110 V.
- What is the CMRR of the INA281B1IDBVR?
The device has a DC CMRR of 120 dB and an AC CMRR of 65 dB at 50 kHz.
- What are the available gain options for the INA281B1IDBVR?
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 INA281B1IDBVR?
The bandwidth is 1.3 MHz.
- What is the slew rate of the INA281B1IDBVR?
The slew rate is 2.5 V/µs.
- What is the quiescent current of the INA281B1IDBVR?
The quiescent current is 1.5 mA.
- What is the supply voltage range for the INA281B1IDBVR?
The device operates from a single supply voltage of 2.7 V to 20 V.
- What are some typical applications of the INA281B1IDBVR?
Typical applications include active antenna systems, macro remote radio units, 48-V rack servers, solenoid and valve control, and telecom equipment.
- How accurate is the gain of the INA281B1IDBVR?
The gain error is ±0.5% maximum, with a gain drift of ±20 ppm/°C over the full temperature range.
- What is the operating temperature range of the INA281B1IDBVR?
The operating temperature range is from –55 °C to 150 °C.
