Analog Devices Inc. AD8278ARMZ-R7

Overview

AD8278ARMZ-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 space-constrained, battery-powered 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 voltage/current monitoring and portable instrumentation.

For engineers reviewing the AD8278ARMZ-R7 datasheet, AD8278ARMZ-R7 pinout, AD8278ARMZ-R7 application, or AD8278ARMZ-R7 equivalent, key selection criteria include input common-mode range extending beyond supply rails (up to ±3×VS), 200 μA max quiescent current, laser-trimmed resistor network for <0.02% gain error, and rugged input overvoltage protection up to ±40 V relative to supply rails.

Technical Context

The AD8278ARMZ-R7 integrates matched thin-film resistors and an op amp core optimized for differential-to-single-ended conversion with exceptional common-mode rejection. Its internal architecture supports both G = ½ and G = 2 configurations without external components, and its input stage tolerates common-mode voltages exceeding supply rails by up to 40 V - critical for high-side current sensing in industrial power supplies.

It features enhanced slew rate (1.4 V/μs), low offset drift (±1 μV/°C max), and gain drift (1 ppm/°C max), all specified across −40°C to +85°C. The device uses a fully differential input topology with dedicated SENSE and REF terminals, enabling precise Kelvin sensing and programmable output referencing independent of input common-mode level.

Key Specifications

Pinout & Package

AD8278ARMZ-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 NC (no connect); all other pins are electrically active and functionally 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 AD8276ARMZ-R7 and INA199A1DCKR, the AD8278ARMZ-R7 provides superior input overvoltage robustness, lower quiescent current, and true dual-supply flexibility - making it optimal for industrial and portable instrumentation requiring guaranteed performance across wide voltage and temperature ranges.

Availability

AD8278ARMZ-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 RoHS-compliant packaging.

Supply support for AD8278ARMZ-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 healthcare markets since 1965.

The AD8278ARMZ-R7 belongs to Analog Devices' precision difference amplifier product line, engineered specifically for low-power, high-CMRR signal conditioning in power-constrained and high-common-mode-voltage environments such as motor control, energy metering, and portable instrumentation.

FAQ

What is the maximum input common-mode voltage for AD8278ARMZ-R7 at ±15 V supplies?

The AD8278ARMZ-R7 supports input common-mode voltages from −3(VS + 0.1) V to +3(VS − 1.5) V in G = ½ configuration. At ±15 V supplies, this translates to −45.3 V to +40.5 V - enabling direct high-side shunt monitoring in 48 V systems without level-shifting circuitry. This specification is validated per Analog Devices Rev. C datasheet Table 2.

Can AD8278ARMZ-R7 operate from a single 3.3 V supply?

Yes, AD8278ARMZ-R7 operates from single supplies as low as 2.0 V. At 3.3 V, it delivers 870 kHz bandwidth (G = ½), 200 μA supply current, and output swing of −3.2 V to +3.15 V (referred to ground) with 10 kΩ load. The REF pin must be biased to midsupply (1.65 V) for rail-to-rail output compliance - confirmed in Table 4 of the AD8278/AD8279 Rev. C datasheet.

Does AD8278ARMZ-R7 require external resistors to set gain?

No, AD8278ARMZ-R7 has internally laser-trimmed resistors that fix gain to either G = ½ or G = 2 - no external components are needed. Gain selection is determined by external wiring: connecting SENSE to −VS configures G = ½; connecting SENSE to OUT configures G = 2. This is detailed in the "Configurations" section (Page 18) of the Rev. C datasheet.

What is the purpose of the SENSE pin on AD8278ARMZ-R7?

The SENSE pin on AD8278ARMZ-R7 provides a Kelvin connection point for the internal feedback resistor network. When routed directly to the shunt resistor's low-side terminal (bypassing PCB trace resistance), it eliminates gain errors caused by voltage drop in sense traces - critical for sub-1% accuracy in high-current measurement. This functionality is explicitly described in the "Circuit Information" section (Page 16) of the datasheet.

Is AD8278ARMZ-R7 RoHS compliant and qualified for industrial temperature range?

Yes, AD8278ARMZ-R7 is fully RoHS compliant and specified for operation across −40°C to +85°C ambient temperature. Its performance parameters - including offset drift (±1 μV/°C max), gain drift (1 ppm/°C max), and CMRR (80 dB min) - are guaranteed over this full industrial range, as documented in Tables 2–5 of the Rev. C datasheet.