Overview
The AD8422BRMZ is a high precision, low power, low noise, rail-to-rail instrumentation amplifier produced by Analog Devices Inc. It 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. The AD8422BRMZ delivers the best performance per unit microampere in the industry, processing signals with ultralow distortion performance that is load independent over its full output range.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Quiescent Current | 368 μA | Maximum |
| Input Voltage Noise | 8 nV/√Hz | At 1 kHz |
| RTI Noise | 0.15 μV p-p | G = 100 |
| Nonlinearity | 0.5 ppm | G = 1, 2 kΩ load |
| CMRR | 80 dB minimum | At 10 kHz, G = 1 |
| Bandwidth | 2.2 MHz | G = 1 |
| Input Offset Drift | 0.3 μV/°C | Maximum |
| Input Bias Current | 0.5 nA | Maximum |
| Supply Range | 4.6 V to 36 V single supply, ±2.3 V to ±18 V dual supply | |
| Input Overvoltage Protection | 40 V from opposite supply | |
| Gain Range | 1 to 1000 | |
| Package | 8-lead LFCSP, 8-lead MSOP, 8-lead SOIC_N | |
| Operating Temperature | −40°C to +85°C (MSOP, SOIC_N), −40°C to +125°C (LFCSP) |
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 maximum input voltage noise at 1 kHz.
- High precision DC performance, including 0.15 μV p-p RTI noise (G = 100) and 0.5 ppm nonlinearity with 2 kΩ load (G = 1).
- 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.
- Gain settable with a single resistor from 1 to 1000.
- High ESD immunity and very low bias current, making it error-free with high source impedance.
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 AD8422BRMZ?
The maximum quiescent current is 368 μA.
- What is the input voltage noise of the AD8422BRMZ at 1 kHz?
The input voltage noise is 8 nV/√Hz at 1 kHz.
- What is the CMRR of the AD8422BRMZ at 10 kHz with a gain of 1?
The CMRR is 80 dB minimum at 10 kHz with a gain of 1.
- What is the bandwidth of the AD8422BRMZ with a gain of 1?
The bandwidth is 2.2 MHz with a gain of 1.
- What is the input overvoltage protection of the AD8422BRMZ?
The inputs are protected from continuous voltages up to 40 V from the opposite supply rail.
- How is the gain of the AD8422BRMZ set?
The gain is settable with a single resistor from 1 to 1000.
- What are the available package types for the AD8422BRMZ?
The AD8422BRMZ is available in 8-lead LFCSP, 8-lead MSOP, and 8-lead SOIC_N packages.
- What is the operating temperature range for the AD8422BRMZ?
The operating temperature range is −40°C to +85°C for MSOP and SOIC_N, and −40°C to +125°C for LFCSP.
- What are some typical applications of the AD8422BRMZ?
Typical applications include medical instrumentation, industrial process controls, strain gages, transducer interfaces, precision data acquisition systems, channel-isolated systems, and portable instrumentation.
- How does the AD8422BRMZ handle high source impedance?
The AD8422BRMZ has very low bias current, making it error-free with high source impedance and allowing multiple sensors to be multiplexed to the inputs.
