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The AD8422BRMZ is a precision, low-power, low-noise rail-to-rail instrumentation amplifier with industry-leading performance per microamp. The AD8422BRMZ processes signals with ultra-low distortion performance, and load does not affect performance across the entire output range.

The AD8422BRMZ is the third-generation product of the industry-standard AD620. It employs new processing techniques and design innovations, offering higher dynamic range and lower error than previous generations, while consuming less than one-third the power. The AD8422 shares the same pin configuration as the AD8221.

The AD8422BRMZ has extremely low bias current and does not introduce error at high source impedance, enabling multiple sensors to be multiplexed to the input. Its low voltage noise and low current noise characteristics make the AD8422BRMZ an ideal choice for measuring Wheatstone bridges.

AD8422BRMZ Features

Low power consumption: Quiescent current: 368 μA (maximum)

Rail-to-rail output  

Low noise, low distortion  

Maximum input voltage noise at 1 kHz: 8 nV/√Hz  

RTI noise: 0.15 µV p-p (G = 100)  

Non-linearity at 2 kΩ load: 0.5 ppm (G = 1)  

Excellent AC performance  

CMRR at 10 kHz: 80 dB (minimum, G = 1)

Bandwidth: 2.2 MHz (G = 1)  

High-precision DC performance (AD8422BRZ)  

CMRR: 150 dB (minimum, G = 1000)  

Gain error: 0.04% (maximum, G = 1000)  

Input offset drift: 0.3 μV/°C (maximum)

Input bias current: 0.5 nA (maximum)  

Wide power supply range  

4.6 V to 36 V single-supply operation  

Dual supply: ±2.3 V to ±18 V  

Input overvoltage protection: 40 V reverse power supply protection  

Gain range: 1 to 1000  

Available in an 8-pin MSOP package  

AD8422BRMZ Applications

Medical instruments  

Industrial process control  

Strain gauges

Sensor interface

Precision data acquisition systems

Channel-isolated systems

Portable instruments and meters

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