Analog Devices Inc. AD8223ARMZ

Overview

AD8223ARMZ 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 battery-powered medical instrumentation.

For engineers reviewing the AD8223ARMZ datasheet, AD8223ARMZ pinout, AD8223ARMZ application, or AD8223ARMZ equivalent, this page delivers verified specifications, validated pin functions, confirmed SOIC-8/MSOP-8 package mapping, real-world use cases in low-power signal conditioning, and two technically documented alternative parts for design flexibility.

Technical Context

The AD8223ARMZ implements a modified 3-op-amp architecture with PNP input buffers enabling input common-mode voltage down to 150 mV below the negative rail, and internal resistor networks (8 kΩ, 10 kΩ, 50 kΩ) that set fixed gain of 5 without external components and enable precise gain scaling up to 1000 using RG.

Its transfer function is V_OUT = G(V_IN+ − V_IN−) + V_REF, where REF provides user-defined output offset; the device supports both single-supply (3–24 V) and dual-supply (±2–±12 V) operation, with quiescent current as low as 350 μA and rail-to-rail output swing on single supply.

Key Specifications

Pinout & Package

AD8223ARMZ is available in 8-lead MSOP (RM) and SOIC (R) packages; both share identical pinout and thermal characteristics per Analog Devices Rev. 0 datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8223ARMZ, AD8420ARMZ trades rail-to-rail output and ultra-low IQ for lower input bias and wider gain flexibility, while INA333AIDRGT prioritizes zero-drift DC accuracy over noise and CMRR - making AD8223ARMZ optimal for cost-sensitive, battery-powered, medium-bandwidth sensor interfaces.

Availability

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

Supply support for AD8223ARMZ 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, with R&D and manufacturing facilities worldwide.

The AD8223ARMZ belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-power, single-supply sensor signal conditioning in portable and industrial measurement systems.

FAQ

What is the default gain of AD8223ARMZ when no external resistor is connected?

The AD8223ARMZ defaults to a gain of 5 when no external resistor is connected between Pins 1 (−RG) and 8 (+RG). This is achieved through precisely matched internal 8 kΩ resistors, resulting in minimal gain drift and error - typically 0.02% for AD8223B grade. The AD8223ARMZ maintains this G = 5 configuration without any external components, simplifying prototyping and reducing BOM count.

Can AD8223ARMZ operate from a 3 V single supply with rail-to-rail output?

Yes, AD8223ARMZ is fully specified for 3 V single-supply operation with rail-to-rail output swing: minimum output is +0.01 V above −VS (ground) and maximum is (+VS − 0.5 V) into a 10 kΩ load. At 3 V, this delivers 0.01 V to 2.5 V output range - sufficient to drive most 12-bit+ SAR ADCs without external level-shifting. The AD8223ARMZ achieves this while consuming only 350–500 μA, making it ideal for coin-cell or Li-ion portable designs.

What is the purpose of the REF pin on AD8223ARMZ, and how should it be driven?

The REF pin on AD8223ARMZ sets the DC offset of the output voltage (V_OUT = G·(V_IN+ − V_IN−) + V_REF). To maintain optimal CMRR (>90 dB), the source impedance driving REF must be ≤5 Ω - typically achieved using a low-impedance op-amp buffer or precision voltage divider with parallel bypass capacitor. Driving REF directly from a high-impedance divider degrades CMRR due to interaction with the internal 50 kΩ resistor network. The AD8223ARMZ REF pin also features ESD protection but must not exceed +VS or −VS by more than 0.3 V.

Does AD8223ARMZ support dual-supply operation, and what are the limits?

Yes, AD8223ARMZ supports dual-supply operation from ±2 V to ±12 V. Absolute maximum supply voltage is ±12 V (24 V total), but Analog Devices recommends operating slightly below ±12 V (e.g., ±11.5 V) to accommodate power supply tolerances. In dual-supply mode, key specs improve: small-signal bandwidth increases to 200 kHz (G = 5), slew rate rises to 0.3 V/μs, and output swing expands to (−VS + 0.3 V) to (+VS − 0.8 V) - enhancing dynamic performance in bench instrumentation and test equipment where AD8223ARMZ is commonly deployed.

How does AD8223ARMZ handle input overvoltage conditions?

AD8223ARMZ includes internal supply-referenced clamping diodes on all pins (IN+, IN−, REF, OUT, RG), allowing safe operation with input overvoltages up to 0.3 V beyond +VS or below −VS - even during power-on/off sequencing. For overvoltages exceeding this, external current-limiting resistors (e.g., 1 kΩ) must be added in series with inputs to restrict diode current to ≤10 mA. This protection is inherent to the AD8223ARMZ silicon design and requires no additional components under normal operating conditions.