Overview
The AD8422BRZ-R7, produced by Analog Devices Inc., is a high precision, low power, low noise, rail-to-rail instrumentation amplifier. It is designed to deliver exceptional performance per unit microampere, making it an ideal choice for a wide range of applications. The AD8422 is the third generation development of the industry standard AD620, leveraging new process technologies and design techniques to achieve higher dynamic range and lower errors while consuming less power than its predecessors.
This amplifier features ultralow distortion performance that is load-independent over its full output range, making it suitable for high channel count or power-sensitive applications. It also includes robust input protection, ensuring reliability without sacrificing noise performance.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Quiescent Current | 368 | μA |
| Input Voltage Noise at 1 kHz | 8 | nV/√Hz |
| RTI Noise (G = 100) | 0.15 | μV p-p |
| Nonlinearity (G = 1, 2 kΩ load) | 0.5 | ppm |
| CMRR at 10 kHz (G = 1) | 80 | dB |
| Bandwidth (G = 1) | 2.2 | MHz |
| Input Offset Drift | 0.3 | μV/°C |
| Input Bias Current | 0.5 | nA |
| Supply Voltage Range | 4.6 V to 36 V (single), ±2.3 V to ±18 V (dual) | V |
| Gain Range | 1 to 1000 | |
| Package | 8-lead SOIC_N | |
| Operating Temperature Range | −40°C to +85°C (SOIC_N), −40°C to +125°C (LFCSP) | °C |
Key Features
- Low power consumption with a maximum quiescent current of 368 μA.
- Rail-to-rail output and wide supply range (4.6 V to 36 V single supply, ±2.3 V to ±18 V dual supply).
- Low noise and distortion, with 8 nV/√Hz input voltage noise at 1 kHz and 0.15 μV p-p RTI noise (G = 100).
- High precision DC performance, including 0.5 ppm nonlinearity with 2 kΩ load (G = 1) and 0.04% maximum gain error (G = 1000).
- Excellent AC specifications, including 80 dB minimum CMRR at 10 kHz (G = 1) and 2.2 MHz bandwidth (G = 1).
- Robust input protection with continuous voltages up to 40 V from the opposite supply rail.
- Single resistor sets the gain from 1 to 1000, and a reference pin for precise offset to the output voltage.
- Very low bias current, making it error-free with high source impedance and suitable for multiplexing multiple sensors.
Applications
- Medical instrumentation
- Industrial process controls
- Strain gages
- Transducer interfaces
- Precision data acquisition systems
- Channel-isolated systems
- Portable instrumentation
Q & A
- What is the maximum quiescent current of the AD8422BRZ-R7?
The maximum quiescent current is 368 μA.
- What is the input voltage noise at 1 kHz for the AD8422BRZ-R7?
The input voltage noise at 1 kHz is 8 nV/√Hz.
- What is the CMRR at 10 kHz for a gain of 1?
The CMRR at 10 kHz for a gain of 1 is 80 dB.
- What is the bandwidth of the AD8422BRZ-R7 for a gain of 1?
The bandwidth for a gain of 1 is 2.2 MHz.
- What is the input bias current of the AD8422BRZ-R7?
The maximum input bias current is 0.5 nA.
- What is the supply voltage range for the AD8422BRZ-R7?
The supply voltage range is 4.6 V to 36 V for single supply and ±2.3 V to ±18 V for dual supply.
- How is the gain set for the AD8422BRZ-R7?
The gain is set using a single resistor and can range from 1 to 1000.
- What kind of input protection does the AD8422BRZ-R7 have?
The AD8422BRZ-R7 has input overvoltage protection up to 40 V from the opposite supply rail.
- What are some common applications of the AD8422BRZ-R7?
Common applications include medical instrumentation, industrial process controls, strain gages, transducer interfaces, and precision data acquisition systems.
- What is the operating temperature range for the AD8422BRZ-R7?
The operating temperature range is −40°C to +85°C for SOIC_N packages and −40°C to +125°C for LFCSP packages.
