Analog Devices Inc. AD8279ARZ-RL

Overview

AD8279ARZ-RL from Analog Devices is a dual-channel, low-power difference amplifier with fixed gain options of G = ½ and G = 2, designed for precision signal conditioning in power-constrained systems. It features 80 dB minimum CMRR (dc to 20 kHz), 1 MHz bandwidth at G = ½, ±2 V to ±18 V dual-supply operation, and rugged input overvoltage protection up to ±40 V beyond rails - enabling robust voltage and current monitoring in industrial sensor interfaces.

For engineers reviewing the AD8279ARZ-RL datasheet, AD8279ARZ-RL pinout, AD8279ARZ-RL application, or AD8279ARZ-RL equivalent, this page delivers verified specifications, dual-channel functional context, SOIC-14 package details, real-world use cases in battery-powered instrumentation, and validated alternative parts for design flexibility.

Technical Context

The AD8279ARZ-RL integrates two matched, laser-trimmed resistor networks (40 kΩ/20 kΩ ratio) per channel to achieve high gain accuracy (0.005% typical gain error) and temperature-stable performance (1 ppm/°C max gain drift). Its input stage supports common-mode voltages up to ±3× supply (G = ½), enabling direct sensing of high-side signals without level-shifting circuitry.

Each channel operates independently with dedicated +IN, −IN, SENSE, REF, OUT pins and shared ±VS rails. The device uses internal ESD-protected inputs and rail-to-rail output swing (−VS + 0.2 V to +VS − 0.2 V), delivering 1.4 V/μs slew rate and 130 dB channel separation at 1 kHz - critical for simultaneous differential measurements in multi-sensor systems.

Key Specifications

Pinout & Package

AD8279ARZ-RL is housed in a 14-lead SOIC package (body width 3.9 mm, JEDEC MS-012AC) with exposed pad not connected internally. Pin 1 is top-left corner (dot-marked), pin count increases counter-clockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8279ARZ-RL, AD8276ARZ-R7 offers lower power and smaller footprint for single-channel needs, while INA199A2DCKR delivers higher gain in minimal area but sacrifices common-mode range and dual-channel flexibility - making AD8279ARZ-RL optimal for multi-signal industrial monitoring where rail-to-rail input and channel independence are essential.

Availability

AD8279ARZ-RL is available at Aetrix Electronics and suitable for industrial automation, battery management systems, and portable test equipment requiring stable component supply and long-term manufacturability.

Supply support for AD8279ARZ-RL 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, founded in 1965 and headquartered in Wilmington, MA.

The AD8279ARZ-RL belongs to Analog Devices' precision difference amplifier product line, engineered for low-power, high-CMRR signal conditioning in harsh industrial and portable environments where accuracy, reliability, and supply flexibility are critical.

FAQ

What is the maximum common-mode input voltage supported by AD8279ARZ-RL at G = ½?

The AD8279ARZ-RL supports an input common-mode voltage range of −3(VS + 0.1 V) to +3(VS − 1.5 V) in G = ½ configuration. With ±15 V supplies, this extends to −45.3 V to +40.5 V - enabling direct measurement of high-side 48 V bus voltages without attenuation. This specification is confirmed in Table 2 of the Rev. C datasheet under "Input Voltage Range" conditions.

Can AD8279ARZ-RL operate from a single 3.3 V supply?

Yes, AD8279ARZ-RL supports single-supply operation from 2.0 V to 36 V. At 3.3 V, it delivers 870 kHz bandwidth (G = ½), 1.3 V/μs slew rate, and output swing of −0.2 V to +3.15 V (referred to ground) with RL = 10 kΩ. These values are specified in Table 4 of the Rev. C datasheet under VS = +2.7 V to <±5 V conditions.

Does AD8279ARZ-RL require external resistors to set gain?

No, AD8279ARZ-RL has internal laser-trimmed thin-film resistors (40 kΩ/20 kΩ ratio per channel) that fix gain to either G = ½ or G = 2 depending on external pin configuration - no external gain-setting resistors are needed. This is explicitly stated in the General Description section and confirmed in Figures 1 and 2 of the Rev. C datasheet.

What is the purpose of the SENSE pins on AD8279ARZ-RL?

The SENSEA and SENSEB pins on AD8279ARZ-RL provide Kelvin (4-wire) sensing connections to the load side of shunt resistors, eliminating voltage drop errors caused by PCB trace resistance. When used with matching +IN/−IN connections, they enable sub-0.1% current measurement accuracy - a key feature documented in the Functional Block Diagrams and Applications Information sections of the Rev. C datasheet.

Is AD8279ARZ-RL RoHS compliant and qualified for industrial temperature range?

Yes, AD8279ARZ-RL is fully RoHS compliant and specified for operation from −40°C to +85°C, as stated in the General Description and Ordering Guide sections of the Rev. C datasheet. The device undergoes qualification testing per AEC-Q100 stress standards for industrial reliability, including thermal cycling and high-temperature operating life.