AD620 Instrumentation Amplifier Module — Adjustable Gain

AD620 Instrumentation Amplifier Module — Adjustable Gain

The AD620 instrumentation amplifier module is built around the Analog Devices AD620 — a precision, low-power instrumentation amplifier with adjustable gain from 1× to 10,000× set by a single external resistor. Ideal for amplifying small differential signals from bridge sensors, strain gauges, thermocouples, and ECG electrodes with excellent common-mode rejection.

Key Specifications

• IC: AD620 | Gain range: 1× to 10,000× (single resistor)
• CMRR: 100dB min | Input offset voltage: 50μV max
• Supply voltage: ±2.3V to ±18V | Quiescent current: 1.3mA
• Bandwidth: 120kHz (G=100) | Noise: 9nV/√Hz
• Compliance: RoHS compliant

Why Choose This?

• ✅ Single resistor gain setting — set any gain from 1× to 10,000× with one resistor
• ✅ 100dB CMRR — excellent rejection of common-mode noise and interference
• ✅ Low noise — 9nV/√Hz for clean amplification of weak signals
• ✅ Low power — 1.3mA quiescent current for battery-powered applications

Typical Applications

• ECG and biomedical signal amplification
• Strain gauge and load cell bridge amplifier
• Thermocouple and RTD signal conditioning
• Wheatstone bridge sensor amplification

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