Overview
The AD8421ARZ, produced by Analog Devices Inc., is a low-cost, low-power, extremely low noise, ultralow bias current, and high-speed instrumentation amplifier. It is designed to be highly versatile and suitable for a broad spectrum of signal conditioning and data acquisition applications. The AD8421ARZ is characterized by its high common-mode rejection ratio (CMRR), low input voltage and current noise, and high precision DC performance, making it an ideal choice for extracting low-level signals in the presence of high-frequency common-mode noise over a wide temperature range.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| Input Voltage Noise at 1 kHz | nV/√Hz | 3.2 | ||
| Current Noise at 1 kHz | fA/√Hz | 200 | ||
| Bandwidth (G = 1) | MHz | 10 | ||
| Bandwidth (G = 100) | MHz | 2 | ||
| Slew Rate | V/µs | 35 | ||
| Settling Time to 0.001% (G = 10) | µs | 0.6 | ||
| CMRR at 20 kHz (G = 1) | dB | 80 | ||
| Input Bias Current | pA | 500 | ||
| Input Offset Voltage Drift | µV/°C | 0.2 | ||
| Gain Drift (G = 1) | ppm/°C | 1 | ||
| Supply Voltage Range | V | ±2.5 to ±18 (dual), 5 to 36 (single) | ||
| Operating Temperature Range | °C | −40 to +85 (MSOP, SOIC), −40 to +125 (LFCSP) | ||
| 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 CMRR: up to 94 dB minimum at G = 1.
- High-speed performance: 10 MHz bandwidth at G = 1 and 2 MHz at G = 100.
- Fast settling time: 0.6 µs to 0.001% at G = 10.
- High slew rate: 35 V/µs.
- Low input bias current: 500 pA maximum.
- Input protection up to 40 V from the opposite supply rail.
- Gain adjustable with a single resistor (G = 1 to 10,000).
- Reference pin for precise output voltage offset.
Applications
- Medical instrumentation.
- Precision data acquisition.
- Microphone preamplification.
- Vibration analysis.
- Multiplexed input applications.
- ADC driver.
Q & A
- What is the typical input voltage noise of the AD8421ARZ at 1 kHz?
The typical input voltage noise is 3.2 nV/√Hz at 1 kHz.
- What is the maximum input bias current of the AD8421ARZ?
The maximum input bias current is 500 pA.
- What is the CMRR of the AD8421ARZ at 20 kHz with a gain of 1?
The CMRR is 80 dB at 20 kHz with a gain of 1.
- What is the settling time of the AD8421ARZ to 0.001% at a gain of 10?
The settling time is 0.6 µs to 0.001% at a gain of 10.
- What are the available package types for the AD8421ARZ?
The available package types are 8-lead LFCSP, 8-lead MSOP, and 8-lead SOIC.
- What is the operating temperature range for the AD8421ARZ in different packages?
The operating temperature range is −40°C to +85°C for MSOP and SOIC packages, and −40°C to +125°C for the LFCSP package.
- Can the AD8421ARZ be used in high-speed signal applications?
- How is the gain of the AD8421ARZ adjusted?
The gain of the AD8421ARZ is adjusted using a single resistor, allowing gains from 1 to 10,000.
- What are some common applications of the AD8421ARZ?
- Does the AD8421ARZ have input protection?
- Can the AD8421ARZ be used in defense and aerospace applications?
