Analog Devices Inc. AD620AR

Overview

AD620AR from Analog Devices is a low-cost, precision instrumentation amplifier designed for high-accuracy signal conditioning in sensor interfaces. It delivers gain from 1 to 10,000 set by a single external resistor, features 50 μV max input offset voltage, 0.6 μV/°C max offset drift, and 1.3 mA max supply current - making it ideal for battery-powered ECG monitors and weigh scale front-ends.

For engineers reviewing the AD620AR datasheet, AD620AR pinout, AD620AR application, or AD620AR equivalent, this page provides verified technical context, real-world performance boundaries, package-specific layout guidance, and validated alternative options for medical, industrial, and portable data acquisition systems.

Technical Context

The AD620AR implements a monolithic three-op-amp architecture with Superβeta bipolar input transistors, enabling 1.0 nA max input bias current and 9 nV/√Hz input voltage noise at 1 kHz. Its gain-setting topology uses internal 24.7 kΩ trimmed resistors and an external RG to achieve 0.15% gain error at G = 100.

It operates from ±2.3 V to ±18 V supplies, supports rail-to-rail output swing within 1.2 V of rails (at ±15 V), and achieves 120 kHz bandwidth at G = 100 with 15 μs settling time to 0.01% for 10 V steps - optimized for multiplexed transducer readout and low-drift DC measurements.

Key Specifications

Pinout & Package

AD620AR is supplied in an 8-lead SOIC (R) package with standard 1.27 mm pitch, compatible with automated PCB assembly and offering thermal resistance θ_JA = 155°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Compared with AD620AR, AD8221ARMZ improves DC accuracy at higher power cost, while AD8226ARMZ reduces supply current and extends input range at the expense of voltage noise - making AD620AR the balanced choice for portable medical and industrial sensor interfaces requiring both precision and efficiency.

Availability

AD620AR is available at Aetrix Electronics and suitable for weigh scales, ECG monitors, transducer interfaces, and battery-powered data loggers requiring stable component supply across extended production lifecycles.

Supply support for AD620AR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD620 product line was engineered specifically for precision DC-coupled sensor signal conditioning - targeting applications where low offset, low drift, and low power coexist, such as medical diagnostics and industrial process control.

FAQ

What is the maximum gain achievable with AD620AR and how is it set?

The AD620AR supports gains from 1 to 10,000, set by a single external resistor (RG) connected between Pins 1 and 8. For G = 10,000, RG = 4.94 Ω is required; the AD620AR datasheet specifies RG tolerance ≤1% and TC <10 ppm/°C for minimal drift. The gain equation is G = 1 + (49.4 kΩ / RG). At G = 1, RG pins remain unconnected.

Does AD620AR support single-supply operation?

Yes, AD620AR operates from a single +4.6 V to +36 V supply (equivalent to ±2.3 V to ±18 V dual supply). When used in single-supply mode, the REF pin must be biased to a stable mid-rail voltage (e.g., V_S/2) using a low-impedance divider or op-amp buffer to maintain output headroom and avoid clipping.

What is the input voltage range specification for AD620AR at ±15 V supplies?

At ±15 V supplies, the AD620AR input voltage range is −VS + 1.9 V to +VS − 1.4 V, i.e., −13.1 V to +13.6 V for differential inputs. This range assumes one input grounded and applies to G = 1. Common-mode range is limited by internal transistor saturation and must stay within these bounds to avoid distortion or increased offset error.

How does AD620AR compare to discrete three-op-amp instrumentation amplifier designs?

AD620AR replaces discrete three-op-amp IAs with monolithic integration, delivering 10× lower supply current (1.3 mA vs. ~15 mA), 50% smaller PCB footprint, and superior matching (40 ppm nonlinearity vs. >100 ppm). Its laser-trimmed resistors eliminate manual calibration, and Superβeta inputs reduce bias current by 10× - directly improving accuracy with high-impedance sensors.

Is AD620AR RoHS compliant and what is its operating temperature range?

Yes, AD620AR is RoHS compliant per Analog Devices' official documentation and qualifies for lead-free reflow soldering. Its specified operating temperature range is −40°C to +85°C (Grade A/B), with guaranteed performance across this range for parameters including offset, gain error, and CMRR - validated per Rev. H datasheet testing conditions.