Analog Devices Inc. AD8279BRZ-RL

Overview

AD8279BRZ-RL from Analog Devices is a dual-channel, low-power, wide-supply-range difference amplifier with fixed gains of G = ½ and G = 2, designed for precision current/voltage monitoring in battery-powered instrumentation. It delivers 80 dB CMRR (dc to 20 kHz), 1 MHz bandwidth at G = ½, and operates from ±2 V to ±18 V or 2.0 V to 36 V single supply - enabling high-common-mode-signal measurement in motor control feedback loops.

For engineers reviewing the AD8279BRZ-RL datasheet, AD8279BRZ-RL pinout, AD8279BRZ-RL application, or AD8279BRZ-RL equivalent, key selection criteria include input voltage range beyond supplies (±3×VS), 300–350 μA per channel supply current, rugged input overvoltage protection, and dual-channel SOIC-14 packaging for space-constrained industrial sensing nodes.

Technical Context

The AD8279BRZ-RL integrates two matched, laser-trimmed resistor networks (40 kΩ/20 kΩ ratio) per channel to achieve precise gain accuracy and high CMRR without external components. Its input stage supports common-mode voltages up to ±27 V with ±15 V supplies - critical for shunt-based current sensing in high-side configurations.

Each channel features independent SENSE, REF, IN+, IN−, OUT, and supply terminals, enabling flexible single-ended or differential output configurations. The device uses rail-to-rail output architecture with ±15 mA short-circuit current limit and 200 pF capacitive load drive capability at G = ½.

Key Specifications

Pinout & Package

AD8279BRZ-RL is housed in a 14-lead SOIC package (JEDEC MS-012AA) with exposed pad not connected internally. Thermal resistance θJA = 105°C/W on 4-layer board. Pin 1 is NC; pins 2–3 and 5–6 form Channel A inputs; pins 13–14 and 8–9 form Channel B inputs; all channels share common ±VS and isolated REF/SENSE terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8276ARZ-R7 and INA199A2DCKR, AD8279BRZ-RL uniquely delivers dual-channel precision amplification with rail-exceeding input range and integrated overvoltage protection - reducing system-level component count and PCB area in multi-sensor industrial monitoring designs.

Availability

AD8279BRZ-RL is available at Aetrix Electronics and suitable for motor control feedback, industrial power supply monitoring, and portable battery management systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AD8279BRZ-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, headquartered in Norwood, MA, serving industrial, automotive, communications, and healthcare markets.

The AD8279 belongs to Analog Devices' precision difference amplifier product line, engineered for low-power, high-CMRR signal conditioning in power-constrained applications where input signals exceed supply rails - such as current sensing in motor drives and energy metering.

FAQ

What is the maximum common-mode input voltage supported by AD8279BRZ-RL?

AD8279BRZ-RL supports common-mode input voltages up to −VS + 40 V and +VS − 40 V per absolute maximum ratings. In practical operation at G = ½ with ±15 V supplies, it maintains 80 dB CMRR up to ±27 V common-mode voltage - enabling direct high-side shunt measurement without attenuators or level shifters.

Can AD8279BRZ-RL operate from a single 3.3 V supply?

Yes, AD8279BRZ-RL operates from single supplies as low as 2.0 V. At 3.3 V, it delivers 870 kHz bandwidth (G = ½), 1.3 V/μs slew rate, and 300–350 μA per channel supply current. Reference must be set to midsupply (1.65 V) for full output swing, and input common-mode range extends to −3(3.3 + 0.1) V = −10.2 V to +3(3.3 − 1.5) V = +5.4 V.

How does the SENSE terminal function in AD8279BRZ-RL?

The SENSE terminal (pins 10 and 12) provides a Kelvin connection point for the load side of the sense resistor. When used with the IN+ and IN− terminals, it eliminates voltage drop errors caused by PCB trace resistance - critical for sub-milliohm shunt accuracy. SENSE must be connected directly to the resistor's load-side pad, not routed through shared copper.

Is AD8279BRZ-RL pin-compatible with other devices in the AD8278/AD8279 family?

No - AD8279BRZ-RL uses a unique 14-lead SOIC pinout optimized for dual-channel operation, while AD8278 variants use 8-lead SOIC or MSOP packages. Pin functions differ significantly: AD8279BRZ-RL has separate REFA/REFB and SENSEA/SENSEB terminals, whereas AD8278 has only one REF and SENSE. PCB layout is not interchangeable.

What is the guaranteed gain error specification for AD8279BRZ-RL?

AD8279BRZ-RL guarantees ±0.02% maximum gain error for Grade B devices at G = ½ or G = 2, measured at TA = 25°C. This specification holds across the full industrial temperature range (−40°C to +85°C) with ±5 ppm/°C gain drift - ensuring stable scaling in precision measurement systems without periodic recalibration.