Overview
The AD8421BRZ-RL, produced by Analog Devices Inc., is a low-cost, low-power, high-performance instrumentation amplifier. It is designed to offer extremely low noise, ultralow bias current, and high speed, making it ideal for a broad spectrum of signal conditioning and data acquisition applications. The amplifier features a current feedback architecture that maintains high performance across a wide range of gains and temperatures.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Temperature Range | −40°C to +85°C | °C |
| Supply Voltage Range | ±2.5 V to ±18 V (dual supply), 5 V to 36 V (single supply) | V |
| Maximum Supply Current | 2.3 mA | mA |
| Input Voltage Noise at 1 kHz | 3.2 nV/√Hz | nV/√Hz |
| Input Current Noise at 1 kHz | 200 fA/√Hz | fA/√Hz |
| Bandwidth (G = 1) | 10 MHz | MHz |
| Bandwidth (G = 100) | 2 MHz | MHz |
| Slew Rate | 35 V/µs | V/µs |
| Settling Time to 0.001% (G = 10) | 0.6 µs | µs |
| CMRR at 20 kHz (G = 1) | 80 dB | dB |
| Input Offset Voltage Drift | 0.2 µV/°C | µV/°C |
| Gain Drift (G = 1) | 1 ppm/°C | ppm/°C |
| Input Bias Current | 500 pA | pA |
| Input Protection | Up to 40 V from opposite supply rail | V |
| Gain Range | 1 to 10,000 | |
| Package Types | 8-lead LFCSP, 8-lead MSOP, 8-lead SOIC |
Key Features
- Low power consumption with a maximum supply current of 2.3 mA.
- Extremely low noise: 3.2 nV/√Hz input voltage noise and 200 fA/√Hz current noise at 1 kHz.
- High speed performance: 10 MHz bandwidth at G = 1 and 2 MHz at G = 100.
- Fast settling time: 0.6 µs to 0.001% (G = 10).
- High common-mode rejection ratio (CMRR): up to 94 dB minimum at G = 1.
- Low input offset voltage drift and gain drift.
- Ultralow bias current: 500 pA maximum.
- Input protection up to 40 V from the opposite supply rail.
- Gain settable with a single resistor from 1 to 10,000.
- Available in 8-lead LFCSP, 8-lead MSOP, and 8-lead SOIC packages.
Applications
- Medical instrumentation.
- Precision data acquisition.
- Microphone preamplification.
- Vibration analysis.
- Multiplexed input applications.
- ADC driver.
Q & A
- What is the operating temperature range of the AD8421BRZ-RL?
The operating temperature range is −40°C to +85°C.
- What is the supply voltage range for the AD8421BRZ-RL?
The supply voltage range is ±2.5 V to ±18 V for dual supply and 5 V to 36 V for single supply.
- What is the maximum supply current of the AD8421BRZ-RL?
The maximum supply current is 2.3 mA.
- What is the input voltage noise of the AD8421BRZ-RL at 1 kHz?
The input voltage noise is 3.2 nV/√Hz at 1 kHz.
- What is the bandwidth of the AD8421BRZ-RL at a gain of 1?
The bandwidth is 10 MHz at a gain of 1.
- What is the slew rate of the AD8421BRZ-RL?
The slew rate is 35 V/µs.
- What is the settling time to 0.001% for the AD8421BRZ-RL at a gain of 10?
The settling time is 0.6 µs to 0.001% at a gain of 10.
- What is the common-mode rejection ratio (CMRR) of the AD8421BRZ-RL at 20 kHz and a gain of 1?
The CMRR is 80 dB at 20 kHz and a gain of 1.
- How is the gain set for the AD8421BRZ-RL?
The gain is settable with a single resistor from 1 to 10,000.
- What are the typical applications of the AD8421BRZ-RL?
Typical applications include medical instrumentation, precision data acquisition, microphone preamplification, vibration analysis, multiplexed input applications, and ADC driver.
