Analog Devices Inc. AD8276BRZ-R7

Overview

AD8276BRZ-R7 from Analog Devices is a precision unity-gain difference amplifier optimized for low-power, wide-supply-range signal conditioning in current and voltage monitoring applications. It delivers 86 dB CMRR (dc to 10 kHz), 550 kHz bandwidth, ±2 µV/°C max system offset drift (B Grade), 1 ppm/°C max gain drift, and operates from 2.0 V to 36 V single supply or ±2 V to ±18 V dual supply.

For engineers reviewing the AD8276BRZ-R7 datasheet, AD8276BRZ-R7 pinout, AD8276BRZ-R7 application, or AD8276BRZ-R7 equivalent, this device serves as a space-efficient, laser-trimmed alternative to discrete resistor networks in battery-powered instrumentation, industrial sensing, and high-common-mode-voltage measurement circuits where quiescent current ≤200 µA and rail-to-rail input capability are critical.

Technical Context

The AD8276BRZ-R7 integrates a low-power op amp with four laser-trimmed 40 kΩ on-chip resistors configured for fixed G = 1 difference amplification. Its input stage accepts common-mode voltages up to ±27 V with ±15 V supplies-nearly double the rails-enabled by internal resistor division and ESD-protected inputs rated to ±40 V beyond either supply rail.

It achieves stable unity-gain operation without external compensation, supports reference voltage injection at the REF pin for level-shifting, and maintains 86 dB CMRR across temperature due to matched resistor ratios (±0.02% typical ratio match). The SENSE pin provides Kelvin connection for accurate output sensing, decoupling load effects from feedback accuracy.

Key Specifications

Pinout & Package

AD8276BRZ-R7 is housed in an 8-lead MSOP (RM-8) package with exposed pad for thermal enhancement. Pin 8 is NC (no connect); all other pins are electrically active and validated per Analog Devices Rev. D datasheet Figure 4 and Table 6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA199A1DRVT and AD8479ARZ, AD8276BRZ-R7 uniquely balances ultra-low power (200 µA), rail-to-rail input extension (±40 V beyond rails), and unity-gain precision-making it the only option among the three viable for portable, wide-supply, and high-CMRR dc-coupled measurement systems.

Availability

AD8276BRZ-R7 is available at Aetrix Electronics and suitable for voltage monitoring, current sensing, portable instrumentation, and industrial sensor interface applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for AD8276BRZ-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 since 1965.

The AD8276/AD8277 product line was designed specifically for precision, low-power difference amplification in space-constrained, battery-sensitive applications-emphasizing laser-trimmed resistor accuracy, extended input range, and robust ESD-hardened inputs.

FAQ

What is the maximum input common-mode voltage for AD8276BRZ-R7?

The AD8276BRZ-R7 accepts input common-mode voltages from −2(V_S + 0.1) V to +2(V_S − 1.5) V. With ±15 V supplies, this enables ±27 V input range-well beyond the rails. Absolute maximum ratings allow up to −V_S + 40 V and +V_S − 40 V at inputs, but operation within the specified linear range requires adherence to the above formula. This capability is intrinsic to AD8276BRZ-R7's internal resistor divider architecture.

Does AD8276BRZ-R7 require external resistors for unity-gain operation?

No. AD8276BRZ-R7 integrates four laser-trimmed 40 kΩ resistors internally, forming a complete G = 1 difference amplifier. No external gain-setting resistors are needed-only connections to +IN, −IN, REF, SENSE, OUT, +VS, and −VS. This eliminates matching errors and board space associated with discrete solutions, a core design advantage of AD8276BRZ-R7.

Can AD8276BRZ-R7 operate from a single 3.3 V supply?

Yes. AD8276BRZ-R7 supports single-supply operation from 2.0 V to 36 V. At 3.3 V, it delivers 450 kHz bandwidth, 1.0 V/µs slew rate, and maintains 86 dB CMRR with V_CM = 0 V to 3.0 V. The REF pin can be biased to 1.65 V for optimal output swing, and quiescent current remains ≤200 µA-making AD8276BRZ-R7 ideal for 3.3 V microcontroller-based sensors.

What is the function of the SENSE pin on AD8276BRZ-R7?

The SENSE pin on AD8276BRZ-R7 provides a Kelvin connection to the output node, enabling remote sensing of the true output voltage at the load. This decouples voltage drop across PCB traces or connectors from the feedback loop, preserving gain accuracy under varying load conditions-a critical feature for precision current monitoring where AD8276BRZ-R7's 1 ppm/°C gain drift must be maintained.

Is AD8276BRZ-R7 RoHS compliant and qualified for industrial temperature range?

Yes. AD8276BRZ-R7 is fully RoHS compliant and specified for operation across −40°C to +85°C ambient temperature. Its performance parameters-including 86 dB CMRR, ±2 µV/°C offset drift, and 200 µA supply current-are guaranteed over this full industrial range, as verified in Analog Devices' Rev. D datasheet Tables 2 and 3. This makes AD8276BRZ-R7 suitable for deployment in harsh factory-floor and outdoor embedded systems.