AD620 Instrumentation Amplifier Module Microvolt Signal 3–12V DC

AD620 Instrumentation Amplifier Module — Microvolt Signal Amplification

This breakout module is built around the Analog Devices AD620 precision instrumentation amplifier IC. With a gain range of 1× to 10,000× set by a single external resistor, input offset voltage of just 50μV, and supply range of 3V–12V, it is the go-to solution for amplifying tiny differential signals from sensors, bridges, and biomedical sources.

Key Specifications

Parameter	Value
Amplifier IC	AD620 (Analog Devices)
Supply Voltage	3V – 12V DC (±1.5V – ±6V dual)
Gain Range	1× – 10,000× (set by RG)
Gain Formula	G = 49.4kΩ / RG + 1
Input Offset Voltage	50μV max
CMRR	100dB min @ G=10
Input Bias Current	1nA typical
Bandwidth @ G=1	1MHz
Bandwidth @ G=100	120kHz

Gain Setting Table

RG Value	Gain
49.4kΩ	2×
5.49kΩ	10×
499Ω	100×
49.9Ω	1000×
No resistor	1× (unity gain)

Why Choose AD620 Module?

• Single Resistor Gain Setting — No complex feedback network; change one resistor to change gain
• 50μV Offset — Amplifies microvolt-level signals without significant DC error
• 100dB CMRR — Rejects common-mode noise (power line interference, EMI)
• Low Input Bias Current — 1nA suits high-impedance sources (pH electrodes, piezo sensors)
• Breakout Board — Screw terminals and header pins for easy prototyping

Typical Applications

• Wheatstone bridge amplification (load cells, pressure sensors, strain gauges)
• ECG / EEG / EMG biomedical signal amplification
• Thermocouple and RTD signal conditioning
• Hall effect sensor differential output amplification
• Data acquisition front-end for ADC inputs
• Precision differential voltage measurement

FAQ

Q: Can AD620 module work with Arduino?
A: Yes — power with 5V single supply (connect –VS to GND, +VS to 5V), set gain, and read output with analogRead(). Ensure output stays within 0–5V range.

Q: What RG resistor gives 100× gain?
A: RG = 49.4kΩ / (G−1) = 49.4kΩ / 99 ≈ 499Ω. Use a 499Ω 1% precision resistor.

Package Contents

• 1× AD620 Instrumentation Amplifier Breakout Module

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