Overview
The AD8422BRMZ-RL, 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 ideal for a variety of applications requiring high accuracy and low power consumption. 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.
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 (G = 1, RL = 2 kΩ) | 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 (Single) | 4.6 | 36 | V | |
| Supply Voltage Range (Dual) | ±2.3 | ±18 | V | |
| Input Overvoltage Protection | 40 | V from opposite supply | ||
| Gain Range | 1 | 1000 | ||
| Operating Temperature Range | −40 | +85 | °C (MSOP, SOIC_N), +125°C (LFCSP) |
Key Features
- High precision, low power, and low noise performance.
- Rail-to-rail output and wide supply range (4.6 V to 36 V single supply, ±2.3 V to ±18 V dual supply).
- Excellent ac specifications, including 2.2 MHz bandwidth and 80 dB minimum CMRR at 10 kHz.
- Low input bias current (0.5 nA maximum) and low input offset drift (0.3 μV/°C maximum).
- Robust input protection up to 40 V from the opposite supply rail.
- Gain settable with a single resistor from 1 to 1000.
- Available in 8-lead LFCSP, 8-lead MSOP, and 8-lead SOIC_N packages.
- High ESD immunity and reliability without sacrificing noise performance.
Applications
- Medical instrumentation.
- Industrial process controls.
- Strain gages and transducer interfaces.
- Precision data acquisition systems.
- Channel-isolated systems and portable instrumentation.
Q & A
- What is the maximum quiescent current of the AD8422?
The maximum quiescent current of the AD8422 is 368 μA.
- What is the input voltage noise at 1 kHz for the AD8422?
The input voltage noise at 1 kHz is 8 nV/√Hz.
- What is the common-mode rejection ratio (CMRR) at 10 kHz for the AD8422?
The CMRR at 10 kHz is a minimum of 80 dB for a gain of 1.
- What is the bandwidth of the AD8422 at a gain of 1?
The bandwidth at a gain of 1 is 2.2 MHz.
- What is the input overvoltage protection of the AD8422?
The inputs are protected from continuous voltages up to 40 V from the opposite supply rail.
- How is the gain of the AD8422 set?
The gain is settable with a single resistor and ranges from 1 to 1000.
- What are the available package types for the AD8422?
The AD8422 is available in 8-lead LFCSP, 8-lead MSOP, and 8-lead SOIC_N packages.
- What is the operating temperature range for the AD8422?
The operating temperature range is from −40°C to +85°C for MSOP and SOIC_N packages, and up to +125°C for LFCSP packages.
- What are some typical applications of the AD8422?
Typical applications include medical instrumentation, industrial process controls, strain gages, transducer interfaces, precision data acquisition systems, and channel-isolated systems.
- How does the AD8422 handle high source impedance?
The AD8422 has very low bias current, making it error-free with high source impedance and allowing multiple sensors to be multiplexed to the inputs.
