Overview
The AD8422ARZ, produced by Analog Devices Inc., is a high precision, low power, low noise, rail-to-rail instrumentation amplifier. It is designed to deliver the best performance per unit microampere in the industry. The AD8422 is the third generation development of the industry-standard AD620, employing new process technologies and design techniques to achieve higher dynamic range and lower errors than its predecessors while consuming less than one-third of the power. It processes signals with ultralow distortion performance that is load independent over its full output range, making it ideal for various precision applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Quiescent Current | 368 | µA | ||
| Input Voltage Noise at 1 kHz | 8 | nV/√Hz | ||
| RTI Noise (G = 100) | 0.15 | µV p-p | ||
| Nonlinearity with 2 kΩ Load (G = 1) | 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 supply) | ±2.3 V to ±18 V (dual supply) | V | |
| Input Overvoltage Protection | 40 V from opposite supply | V | ||
| Gain Range | 1 | 1000 | ||
| Operating Temperature Range | -40°C to +85°C | °C | ||
| Package Types | 8-lead LFCSP, 8-lead MSOP, 8-lead SOIC_N |
Key Features
- Low power consumption: 368 µA maximum quiescent current
- Rail-to-rail output
- Low noise and distortion: 8 nV/√Hz maximum input voltage noise at 1 kHz and 0.15 µV p-p RTI noise (G = 100)
- Excellent ac specifications: 80 dB minimum CMRR at 10 kHz (G = 1) and 2.2 MHz bandwidth (G = 1)
- High precision dc performance: 0.04% maximum gain error (G = 1000) and 0.3 µV/°C maximum input offset drift
- Low input bias current: 0.5 nA maximum
- Wide supply range: 4.6 V to 36 V single supply and ±2.3 V to ±18 V dual supply
- Input overvoltage protection: up to 40 V from opposite supply
- Gain range: 1 to 1000 set by a single resistor
- Robust input protection and high ESD immunity
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 AD8422ARZ?
The maximum quiescent current of the AD8422ARZ is 368 µA.
- What is the input voltage noise at 1 kHz for the AD8422ARZ?
The input voltage noise at 1 kHz for the AD8422ARZ 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 minimum.
- What is the bandwidth of the AD8422ARZ for a gain of 1?
The bandwidth of the AD8422ARZ for a gain of 1 is 2.2 MHz.
- What is the input offset drift of the AD8422ARZ?
The input offset drift of the AD8422ARZ is 0.3 µV/°C.
- What is the maximum input bias current of the AD8422ARZ?
The maximum input bias current of the AD8422ARZ is 0.5 nA.
- What is the supply voltage range for the AD8422ARZ?
The supply voltage range for the AD8422ARZ is 4.6 V to 36 V for single supply and ±2.3 V to ±18 V for dual supply.
- What is the input overvoltage protection of the AD8422ARZ?
The AD8422ARZ has input overvoltage protection up to 40 V from the opposite supply rail.
- How is the gain of the AD8422ARZ set?
The gain of the AD8422ARZ is set by a single resistor and can range from 1 to 1000.
- What are some common applications of the AD8422ARZ?
The AD8422ARZ is commonly used in medical instrumentation, industrial process controls, strain gages, transducer interfaces, precision data acquisition systems, channel-isolated systems, and portable instrumentation.
