AD8421 Precision Instrument Amplifier, Micro-Signal Millivolt/Microvolt Voltage Amplifier Module, Single-Ended/Differential

The AD8421 is a low-cost, low-power, extremely low-noise, ultra-low bias current high-speed instrumentation amplifier, particularly suitable for a wide range of signal conditioning and data acquisition applications. This product features an extremely high common-mode rejection ratio (CMRR), enabling it to extract low-level signals submerged in high-frequency common-mode noise over a wide temperature range. Product Features Low Power Consumption MAX Supply Current: 2.3 mA Low Noise MAX Input Voltage Noise: 3.2 nV/VHz at 1 kHz Current Noise: 200 fA/VHz at 1 kHz Excellent AC Characteristics Bandwidth: 10 MHz (G=1) Bandwidth: 2 MHz (G=100) 0.001% Settling Time: 0.6 μs (G=10) CMRR: 80 dB (20 kHz, G=1) Slew Rate: 35 V/μs High-Precision DC Performance (AD8421BRZ) CMRR: 94 dB (MIN, G=1) Input Offset Voltage Drift: 0.2 μV/°C (MAX) MAX Gain Drift: 1 ppm/°C (G=1) Input Bias Current: 500 PA (MAX) Input Overvoltage Protection: Up to 40 V Reverse Supply ±2.5 V to ±18 V Dual Supply Operation (5 V to 36 V) (Single power supply) Gain set via a single resistor (G=1 to 10,000) Applications Medical instruments Precision data acquisition systems Microphone preamplifiers Vibration analysis Multiplexed input applications ADC drivers

• High-Precision Signal Amplification: Equipped with the AD8421 instrumentation amplifier, this module delivers accurate amplification of extremely weak millivolt and microvolt signals—ideal for sensitive measurement tasks.
• Supports Single-Ended & Differential Inputs: Flexible input design allows for both single-ended and differential signal sources, making it suitable for a wide range of sensor and data acquisition applications.
• Low Noise & High CMRR: Features ultra-low noise performance and high common-mode rejection ratio (CMRR), ensuring stable, interference-free signal output even in challenging environments.
• Easy Integration with Microcontrollers: Compatible with Arduino, Raspberry Pi, STM32, and other development boards. The compact PCB layout and clearly labeled connections make installation and prototyping fast and straightforward.
• Versatile for Professional & DIY Projects: Perfect for scientific research, medical equipment, industrial automation, and any project requiring reliable amplification of small analog signals. Unlock precise signal processing for your next innovation.