Overview
The AD8421ARMZ-RL, produced by Analog Devices Inc., is a low-cost, low-power, extremely low-noise, ultralow bias current, high-speed instrumentation amplifier. It is designed for a broad spectrum of signal conditioning and data acquisition applications. This amplifier is notable for its high common-mode rejection ratio (CMRR), low noise, and high-speed performance, making it suitable for extracting low-level signals in the presence of high-frequency common-mode noise over a wide temperature range.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Bandwidth (G = 1) | 10 | 10 | 10 | MHz |
| Bandwidth (G = 100) | 2 | 2 | 2 | MHz |
| Settling Time to 0.001% (G = 10) | 0.6 | 0.6 | 0.6 | µs |
| CMRR at 20 kHz (G = 1) | 80 | 80 | 80 | dB |
| Slew Rate | 35 | 35 | 35 | V/µs |
| Input Voltage Noise at 1 kHz | 3.2 | nV/√Hz | ||
| Current Noise at 1 kHz | 200 | fA/√Hz | ||
| Input Bias Current | 500 | pA | ||
| Input Offset Voltage Drift | 0.2 | µV/°C | ||
| Gain Drift (G = 1) | 1 | ppm/°C | ||
| Supply Current | 2.3 | mA | ||
| Operating Temperature Range | -40 | 85 | °C | |
| Package Type | 8-lead MSOP |
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 (G = 1) and 35 V/µs slew rate.
- High precision DC performance with a maximum input offset voltage drift of 0.2 µV/°C and a maximum gain drift of 1 ppm/°C (G = 1).
- Ultralow bias current of 500 pA maximum.
- Inputs protected to 40 V from the opposite supply rail.
- Dual supply operation: ±2.5 V to ±18 V (5 V to 36 V single supply).
- Gain settable with a single resistor (G = 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 typical bandwidth of the AD8421 at a gain of 1? The typical bandwidth is 10 MHz at a gain of 1.
- What is the maximum input bias current of the AD8421? The maximum input bias current is 500 pA.
- What is the slew rate of the AD8421? The slew rate is 35 V/µs.
- What are the operating temperature ranges for the AD8421? The operating temperature ranges are from -40°C to +85°C for MSOP and SOIC packages, and from -40°C to +125°C for the LFCSP package.
- How is the gain of the AD8421 set? The gain is set with a single resistor and can range from 1 to 10,000.
- What are some typical applications of the AD8421? Typical applications include medical instrumentation, precision data acquisition, microphone preamplification, vibration analysis, and multiplexed input applications.
- What is the input voltage noise of the AD8421 at 1 kHz? The input voltage noise is 3.2 nV/√Hz at 1 kHz.
- What is the maximum supply current of the AD8421? The maximum supply current is 2.3 mA.
- How is the input protection of the AD8421? The inputs are protected to 40 V from the opposite supply rail.
- What are the available package types for the AD8421? The AD8421 is available in 8-lead LFCSP, 8-lead MSOP, and 8-lead SOIC packages.
