Analog Devices Inc. AD8223ARMZ-R7

Overview

AD8223ARMZ-R7 from Analog Devices is a single-supply, low-power instrumentation amplifier with rail-to-rail output swing (3 V to 24 V), gain programmable from 5 to 1000 via one external resistor, 30 nV/√Hz input-referred voltage noise at 1 kHz (G = 1000), and 25 nA max input bias current - used in thermocouple amplification, transducer interfaces, and low-power medical instrumentation.

For engineers reviewing the AD8223ARMZ-R7 datasheet, AD8223ARMZ-R7 pinout, AD8223ARMZ-R7 application, or AD8223ARMZ-R7 equivalent, this page delivers verified specifications, exact pin functions, real-world use cases, and validated alternative parts for precision analog signal conditioning in battery-powered and industrial systems.

Technical Context

The AD8223ARMZ-R7 implements a modified 3-op-amp architecture with PNP input buffers enabling input common-mode voltage down to 150 mV below the negative rail. Its gain stage uses an external resistor across −RG/+RG pins to set G = 5 + (80 kΩ/RG), while the final differential stage provides fixed ×5 gain and removes common-mode content.

It supports both single-supply (3 V to 24 V) and dual-supply (±2 V to ±12 V) operation, with rail-to-rail output swing on single supply and 0.2 V/μs slew rate (G = 5, +5 V). Input impedance is 2 GΩ || 2 pF (differential and common-mode), and reference terminal (REF) allows precise output level shifting relative to an external voltage source.

Key Specifications

Pinout & Package

AD8223ARMZ-R7 is packaged in an 8-lead MSOP (RM) with 0.65 mm pitch, rated for −40°C to +85°C operation and compatible with standard surface-mount reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8223ARMZ-R7, AD8420ARMZ trades power efficiency for speed and noise performance, while INA333AIDRGT sacrifices sub-rail input capability for ultra-low drift - making AD8223ARMZ-R7 uniquely balanced for low-power, sub-ground, general-purpose instrumentation.

Availability

AD8223ARMZ-R7 is available at Aetrix Electronics and suitable for low-power medical instrumentation, transducer interface circuits, and industrial process controls requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for AD8223ARMZ-R7 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, serving industrial, automotive, communications, and healthcare markets.

The AD8223 belongs to Analog Devices' precision instrumentation amplifier product line, designed specifically for low-power, single-supply signal conditioning in sensor front-ends where sub-rail input capability and rail-to-rail output are essential.

FAQ

What supply voltage ranges does the AD8223ARMZ-R7 support?

The AD8223ARMZ-R7 operates from single supply (3 V to 24 V, with −VS = 0 V) or dual supply (±2 V to ±12 V). At ±12 V, it reaches absolute maximum ratings; Analog Devices recommends nominal operation slightly below ±12 V to accommodate supply tolerances. Quiescent current is 500 μA max at 25°C under single-supply conditions.

How is gain set on the AD8223ARMZ-R7, and what is the default gain?

Gain on the AD8223ARMZ-R7 is set using a single external resistor (RG) between Pins 1 (−RG) and 8 (+RG), following G = 5 + (80 kΩ/RG). With no external resistor installed, internal matching sets gain to exactly G = 5. Gain error is as low as 0.02% for G = 5 and remains ≤0.3% up to G = 1000, excluding RG tolerance effects.

Can the AD8223ARMZ-R7 amplify signals below ground, and how far?

Yes - the AD8223ARMZ-R7 accepts input common-mode voltages down to (−VS) − 0.15 V, enabling direct amplification of signals 150 mV below ground in single-supply configurations. This is enabled by its PNP-input-stage architecture and makes it suitable for thermocouple and grounded-sensor applications without level-shifting circuitry.

What is the purpose of the REF pin on the AD8223ARMZ-R7?

The REF pin on the AD8223ARMZ-R7 defines the output reference level: VOUT = G(VIN+ − VIN−) + VREF. It allows precise level-shifting - e.g., tying REF to mid-supply enables direct interfacing with single-supply ADCs. For optimal CMRR, REF must be driven by a low-impedance source (<5 Ω), as its internal 50 kΩ resistor forms part of the common-mode rejection network.

Does the AD8223ARMZ-R7 include input protection, and what are its limits?

Yes - the AD8223ARMZ-R7 integrates supply-referenced clamping diodes on all pins (IN, OUT, REF, RG), allowing safe operation with input overvoltages up to ±0.3 V beyond the supply rails. During power-off or partial power-up, these diodes remain active. For overvoltages exceeding ±0.3 V, external current-limiting resistors (e.g., 1 kΩ) should be added to restrict diode current to ≤10 mA.