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。
特性
- Low power: 330 μA maximum quiescent current
- Rail-to-rail output
- Low noise and distortion
- 8nV/√Hz maximum input voltage noise at 1 kHz
- 0.15 μV p-p RTI noise (G=100)
- 0.5 ppm nonlinearity with 2kΩ load (G = 1)
- Excellent ac specifications
- 80 dB minimum CMRR at 7kHz (G = 1)
- 2.2MHz bandwidth (G = 1)
- High precision dc performance (AD8422BRZ)
- 150 dB 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
- 3.6 V to 36 V single supply
- ±1.8 V to ±18 V dual supply
- Input overvoltage protection: 40 V from opposite supply
- Gain range: 1 to 1000
应用
- Medical instrumentation
- Industrial process controls
- Strain gauges
- Transducer interfaces
- Precision data acquisition systems
- Channel-isolated systems
- Portable instrumentation
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?