Analog Devices Inc. AD8422 仪表放大器
Analog Devices AD8422 是一款高精密、低功耗、低噪声轨到轨仪表放大器。Analog Devices AD8422以超低失真性能处理信号，在整个输出范围内负载不影响性能。AD8422具有极低的偏置电流，高源阻抗时不会产生误差，允许多个传感器多路复用至输入端。低电压噪声和低电流噪声特性使AD8422成为测量惠斯登电桥的理想选择。AD8422具有鲁棒的输入保护，能够确保稳定性，并且不牺牲噪声性能。AD8422具有高ESD抑制能力和针对来自相反供电轨、高达40V的连续电压输入保护。通过一个电阻可将增益设置为1至1000。基准引脚可用来向输出电压施加精确失调。AD8422的额定工作温度范围为 −40℃至+85℃，可在高达125℃时保证典型性能曲线。共有8引脚MSOP和8引脚SOIC两种封装。
The AD8422 uses robust input protection that ensures reliability without sacrificing noise performance. The AD8422 has high ESD immunity, and the inputs are protected from continuous voltages up to 40 V from the opposite supply rail. A single resistor sets the gain from 1 to 1000. The reference pin can be used to apply a precise offset to the output voltage. The AD8422 is specified from −40°C to +85°C and has typical performance curves to 125°C. It is available in 8-lead MSOP and 8-lead SOIC packages.
特性
- 330μA maximum quiescent current
- Rail-to-rail output
- Low noise and distortion
- 8nV/√Hz maximum input voltage noise at 1kHz
- 0.15μV p-p RTI noise (G=100)
- 0.5ppm nonlinearity with 2kΩ load (G = 1)
- Excellent ac specifications
- 80dB minimum CMRR at 7kHz (G = 1)
- 2.2MHz bandwidth (G = 1)
- High precision dc performance (AD8422BRZ)
- 150dB minimum CMRR (G = 1000)
- 0.04% maximum gain error (G = 1000)
- 0.3μV/°C maximum input offset drift
- 0.5nA maximum input bias current
- Wide supply range
- 3.6V to 36V single supply
- ±1.8V to ±18V dual supply
- 40V from opposite supply Input overvoltage protection
- 1 to 1000 Gain range
应用
- Medical instrumentation
- Industrial process controls
- Strain gauges
- Transducer interfaces
- Precision data acquisition systems
- Channel-isolated systems
- Portable instrumentation
Additional Resources
Achieving a Fully Differential Output Using Single-Ended Instrumentation Amplifiers
As the drive for precision moves forward, fully differential signal chain components are desired for their performance with one of the major advantages being noise rejection that can be picked up by signal routing. So can we generate a differential output signal using instrumentation amplifiers?