Analog Devices Inc. AD8278BRMZ-R7

Overview

AD8278BRMZ-R7 from Analog Devices is a precision, low-power difference amplifier with fixed gain options of G = ½ or G = 2, designed for high-accuracy signal conditioning in power-constrained systems. It delivers 80 dB minimum CMRR (dc to 20 kHz), 1 MHz bandwidth at G = ½, and operates from single supplies as low as 2.0 V up to 36 V - enabling use in battery-powered voltage/current monitoring circuits.

For engineers reviewing the AD8278BRMZ-R7 datasheet, AD8278BRMZ-R7 pinout, AD8278BRMZ-R7 application, or AD8278BRMZ-R7 equivalent, key selection criteria include input common-mode range extending beyond supply rails (up to ±3×VS), 200 μA max quiescent current per channel, rugged input overvoltage protection, and MSOP-8 package compatibility with space-sensitive PCB layouts.

Technical Context

The AD8278BRMZ-R7 integrates laser-trimmed thin-film resistors to achieve precise gain accuracy (0.005% typical gain error) and high CMRR without external components. Its input stage supports rail-to-rail output swing and accepts common-mode voltages up to ±27 V with ±15 V supplies - critical for industrial sensor interfaces where signals exceed supply limits.

It features enhanced slew rate (1.4 V/μs), low offset drift (±1 μV/°C max), and low gain drift (1 ppm/°C max), making it suitable for precision dc-coupled measurement paths. The internal architecture includes ESD-protected inputs and built-in short-circuit current limiting (±15 mA), ensuring robustness in field-deployed instrumentation.

Key Specifications

Pinout & Package

AD8278BRMZ-R7 is housed in an 8-lead MSOP package (3 mm × 3 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. Pin 8 is no-connect; all other pins are electrically active and defined per Analog Devices Rev. C datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8278BRMZ-R7, AD8276ARMZ-R7 offers design flexibility at the expense of higher current draw and added component count, while INA199A1DCKR trades common-mode range and configurability for minimal quiescent power and smallest footprint - making AD8278BRMZ-R7 optimal for precision, wide-range, low-power differential measurement where fixed G = ½ or G = 2 meets system requirements.

Availability

AD8278BRMZ-R7 is available at Aetrix Electronics and suitable for voltage measurement and monitoring, current measurement and monitoring, and portable, battery-powered equipment requiring stable component supply and guaranteed long-term availability.

Supply support for AD8278BRMZ-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, communications, automotive, and consumer markets since 1965.

The AD8278 is part of Analog Devices' precision difference amplifier product line, engineered specifically for low-power, high-CMRR signal conditioning in battery-operated and industrial instrumentation applications where accuracy, reliability, and small size are critical.

FAQ

What is the maximum common-mode input voltage supported by AD8278BRMZ-R7 at ±15 V supplies?

At ±15 V supplies and G = ½, AD8278BRMZ-R7 supports a common-mode input range from −3(VS + 0.1) V to +3(VS − 1.5) V, i.e., −45.3 V to +40.5 V. This allows direct interfacing with high-side shunts in industrial power systems without external attenuation. The absolute maximum rating is −VS + 40 V / +VS − 40 V, confirming safe operation within this extended range.

Can AD8278BRMZ-R7 be used with a single 3.3 V supply?

Yes, AD8278BRMZ-R7 operates from single supplies as low as 2.0 V. At 3.3 V, it maintains 80 dB CMRR (dc–20 kHz) and 870 kHz bandwidth (G = ½), with output swing of −3.2 V to +3.15 V (referred to supply rails). Reference pin (REF) must be biased to midsupply (1.65 V) for proper output centering in single-supply configurations.

Does AD8278BRMZ-R7 require external compensation capacitors?

No, AD8278BRMZ-R7 is internally compensated and stable driving capacitive loads up to 200 pF (G = ½) or 350 pF (G = 2). For loads exceeding these values, a small series resistor (e.g., 10 Ω) between OUT and the load is recommended to maintain phase margin - no external capacitor is needed for standard PCB traces or typical ADC input capacitance.

How does the SENSE pin function in AD8278BRMZ-R7?

The SENSE pin on AD8278BRMZ-R7 provides a Kelvin connection to the output load, enabling remote sensing of voltage drop across PCB traces or connectors. When used, it improves output accuracy by compensating for IR losses - especially critical in high-precision current monitoring where trace resistance introduces gain error. SENSE must be connected directly to the load side of the output path.

Is AD8278BRMZ-R7 RoHS compliant and qualified for industrial temperature range?

Yes, AD8278BRMZ-R7 is fully RoHS compliant and specified for operation across the industrial temperature range of −40°C to +85°C. Data sheet Rev. C confirms performance validation over this range, including guaranteed 200 μA max supply current, 80 dB CMRR, and ±1 μV/°C offset drift - meeting IEC 60747 and JEDEC J-STD-020 standards for surface-mount reliability.