Analog Devices Inc. AD8223BRMZ-R7

Overview

AD8223BRMZ-R7 from Analog Devices is a single-supply, low-power instrumentation amplifier with rail-to-rail output swing, 5–1000 programmable gain via one external resistor, 30 nV/√Hz input-referred voltage noise at G = 1000, and operation from +3 V to +24 V (or ±2 V to ±12 V). It delivers high CMRR (up to 96 dB), 25 nA max input bias current, and supports thermocouple amplification in battery-powered medical sensors.

For engineers reviewing the AD8223BRMZ-R7 datasheet, AD8223BRMZ-R7 pinout, AD8223BRMZ-R7 application, or AD8223BRMZ-R7 equivalent, key selection criteria include its single-resistor gain configuration, −150 mV input common-mode range below ground, 500 μA max quiescent current, and 8-lead MSOP package compatibility with space-constrained industrial and portable instrumentation designs.

Technical Context

The AD8223BRMZ-R7 implements a modified 3-op-amp architecture with PNP input buffers enabling input voltages down to 150 mV below the negative rail. Its second stage uses an external RG resistor to set gain per G = 5 + (80 kΩ/RG), while the third stage provides fixed ×5 differential gain and common-mode rejection.

It features a dedicated REF pin for precise output level-shifting, ESD-protected inputs rated to ±VS ± 0.3 V, and internal clamping that maintains safe operation during power sequencing. The device achieves rail-to-rail output swing on single supply (e.g., +0.01 V to +VS − 0.15 V at 100 kΩ load) without requiring dual supplies.

Key Specifications

Pinout & Package

AD8223BRMZ-R7 is housed in an 8-lead MSOP (RM) package with 0.65 mm lead pitch, optimized for compact PCB layouts and thermal performance (θJA = 200°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8223BRMZ-R7, AD8420ARMZ trades rail-to-rail output and low quiescent current for enhanced high-temperature robustness, while INA333AIDRGT prioritizes zero-drift precision at the expense of power efficiency-making AD8223BRMZ-R7 optimal for portable, battery-sensitive instrumentation with wide supply and common-mode range needs.

Availability

AD8223BRMZ-R7 is available at Aetrix Electronics and suitable for low-power medical instrumentation, thermocouple amplifiers, and industrial process controls requiring stable component supply across long production lifecycles.

Supply support for AD8223BRMZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The AD8223BRMZ-R7 belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-power, single-supply sensor signal conditioning in portable and harsh-environment applications.

FAQ

What supply voltage ranges does the AD8223BRMZ-R7 support?

The AD8223BRMZ-R7 operates from +3 V to +24 V on single supply or ±2 V to ±12 V on dual supply. Its design ensures full functionality across this range, including rail-to-rail output swing at minimum 3 V and stable gain accuracy up to maximum 24 V. Internal protection circuitry prevents damage during supply sequencing, making AD8223BRMZ-R7 suitable for systems with asymmetric or staggered power-up profiles.

How is gain configured on the AD8223BRMZ-R7?

Gain on the AD8223BRMZ-R7 is set using a single external resistor (RG) connected between Pins 1 (−RG) and 8 (+RG), following G = 5 + (80 kΩ/RG). With no external resistor, it defaults to G = 5. Standard 1% resistors yield gains from 8 to 1000; for example, 845 Ω gives G ≈ 99.7. System gain accuracy depends on RG tolerance and temperature coefficient, so AD8223BRMZ-R7's internal matching minimizes error when RG is omitted.

What is the purpose of the REF pin on the AD8223BRMZ-R7?

The REF pin on the AD8223BRMZ-R7 defines the output common-mode voltage: VOUT = G(VIN+ − VIN−) + VREF. It enables level-shifting to match downstream ADC reference points-e.g., tying REF to +2.5 V centers a 0–5 V output span. For best CMRR, the REF source impedance must be <5 Ω; exceeding this degrades common-mode rejection due to interaction with the internal 50 kΩ resistor network.

Can the AD8223BRMZ-R7 amplify signals below ground?

Yes, the AD8223BRMZ-R7 accepts input common-mode voltages down to −VS − 0.15 V, enabling direct amplification of sub-ground signals such as thermocouple outputs referenced to chassis ground. This capability stems from its PNP-input-stage architecture, which avoids the diode-drop limitation of conventional op-amp-based in-amps. At G = 5 and +VS = +5 V, usable input range extends from −0.15 V to +3.5 V.

What are the key layout considerations for the AD8223BRMZ-R7?

Key layout practices for AD8223BRMZ-R7 include placing 0.1 μF ceramic and 10 μF tantalum decoupling capacitors within 2 mm of Pins 4 (−VS) and 7 (+VS); routing RG traces as a matched pair away from noise sources; keeping REF trace short and low-impedance (<5 Ω); and using symmetric, equal-length traces for +IN and −IN to preserve CMRR. Avoid routing digital switching signals beneath the device or its input traces.