INA281数据手册开发板套件编程器的评估板-运算放大器规格书PDF

描述 Description

The INA281 is a high-precision current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from –4 V to 110 V. The negative common-mode voltage allows the device to operate below ground, thus accommodating precise measurement of recirculating currents in half-bridge applications. The combination of a low offset voltage, small gain error and high DC CMRR enables highly accurate current measurement. The INA281 is not only designed for DC current measurement, but also for high-speed applications (like fast overcurrent protection, for example) with a high bandwidth of 1.3 MHz and an 65-dB AC CMRR (at 50 kHz).

The INA281 operates from a single 2.7-V to 20-V supply, drawing 1.5 mA of supply current. The INA281 is available with five gain options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. These gain options address wide dynamic range for current-sensing applications.

The INA281 is specified over an operating temperature range of −40 °C to +125 °C and is offered in a space-saving SOT-23 package with two pin-out variants.

特性 Features

• Wide common-mode voltage:
• Operational voltage: −4 V to +110 V
• Survival voltage: −20 V to +120 V

• Excellent CMRR:
• 120-dB DC CMRR
• 65-dB AC CMRR at 50 kHz

• Accuracy:
• Gain:
• Gain error: ±0.5% (maximum)
• Gain drift: ±20 ppm/°C (maximum)

• Offset:
• Offset voltage: ±55 µV (typical)
• Offset drift: ±0.1 µV/°C (typical)


• Available gains:
• INA281A1, INA281B1 : 20 V/V
• INA281A2, INA281B2 : 50 V/V
• INA281A3, INA281B3 : 100 V/V
• INA281A4, INA281B4 : 200 V/V
• INA281A5, INA281B5 : 500 V/V

• High bandwidth: 1.3 MHz
• Slew rate: 2.5V/µs
• Quiescent current: 1.5 mA