Analog Devices Inc. AD8276BRMZ

Overview

AD8276BRMZ 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 system offset drift (B Grade), 1 ppm/°C gain drift, and operates from single supplies as low as 2.0 V up to 36 V or dual supplies ±2 V to ±18 V.

For engineers reviewing the AD8276BRMZ datasheet, AD8276BRMZ pinout, AD8276BRMZ application, or AD8276BRMZ equivalent, this device is selected for high-accuracy differential measurement where rail-to-rail input common-mode range beyond supplies, rugged input overvoltage protection, and ultra-low quiescent current (200 µA max) are critical design requirements.

Technical Context

The AD8276BRMZ integrates four laser-trimmed 40 kΩ resistors and a low-power op amp in a monolithic architecture, enabling precise unity-gain difference amplification without external components. Its input stage accepts common-mode voltages up to −2(VS + 0.1) V and +2(VS − 1.5) V, supporting measurements beyond supply rails.

It features internal ESD protection and input overvoltage tolerance of ±40 V relative to supply rails, eliminating need for external clamping. The device is unity-gain stable and supports alternative configurations (G = −1, +1, +2) via external connections to SENSE and REF pins.

Key Specifications

Pinout & Package

The AD8276BRMZ is housed in an 8-lead MSOP (RM-8) package with exposed pad, offering compact footprint and enhanced thermal performance (θJA = 135°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA149IDR and AD8479ARZ, the AD8276BRMZ uniquely balances ultra-low power (200 µA), wide supply flexibility (2.0–36 V), and robust ±40 V input tolerance-making it optimal for space- and energy-constrained industrial and portable instrumentation where moderate bandwidth suffices.

Availability

AD8276BRMZ is available at Aetrix Electronics and suitable for current sensing in motor drives, voltage monitoring in solar inverters, portable battery tester calibration, and industrial PLC analog input modules requiring stable component supply across long production lifecycles.

Supply support for AD8276BRMZ 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.

The AD8276BRMZ belongs to Analog Devices' precision difference amplifier product line, designed specifically for low-power, high-CMRR signal conditioning in current/voltage measurement systems where accuracy, supply flexibility, and ruggedness are essential.

FAQ

What is the maximum input voltage the AD8276BRMZ can tolerate without damage?

The AD8276BRMZ tolerates input voltages from −VS + 40 V to +VS − 40 V. For example, with ±15 V supplies, inputs may safely reach −55 V to +55 V. This rating assumes no sustained current flow through internal ESD diodes; external series resistance is recommended if input current exceeds 10 mA. The AD8276BRMZ data sheet specifies absolute maximum ratings in Table 4.

Does the AD8276BRMZ require external resistors for basic unity-gain difference operation?

No, the AD8276BRMZ does not require external resistors for unity-gain difference operation. It integrates four laser-trimmed 40 kΩ resistors internally, forming a complete, precision-matched difference amplifier. External components are only needed for non-standard configurations such as G = −1 or differential output, using the SENSE and REF pins. The AD8276BRMZ functional block diagram (Figure 1) confirms this integrated architecture.

What is the guaranteed CMRR performance of the AD8276BRMZ over frequency?

The AD8276BRMZ guarantees minimum 86 dB CMRR from dc to 10 kHz under standard test conditions (VS = ±15 V, VCM = ±27 V). Figure 14 in the datasheet shows typical CMRR remains ≥80 dB up to 100 kHz and ≥60 dB at 1 MHz. Performance degrades gradually above 10 kHz due to internal resistor parasitics-not abrupt roll-off-making it suitable for PWM-rich environments like motor control.

Can the AD8276BRMZ operate from a single 3.3 V supply?

Yes, the AD8276BRMZ operates from single supplies as low as 2.0 V, including 3.3 V. At VS = 3.3 V, it maintains 450 kHz bandwidth, 1.0 V/µs slew rate, and 86 dB CMRR (VCM = 0 V to 2.4 V). Output swing is specified as −VS + 0.1 V to +VS − 0.15 V, yielding ~0.1 V to 3.15 V with proper REF biasing. The AD8276BRMZ Table 3 confirms full functionality at 2.7 V, validating 3.3 V compatibility.

How does the SENSE pin function in the AD8276BRMZ?

The SENSE pin on the AD8276BRMZ provides access to the internal feedback node between the op amp output and the 40 kΩ resistor network. Connecting SENSE to OUT configures unity gain; connecting SENSE to REF enables G = −1; connecting SENSE to +IN yields G = +2. This pin enables reconfiguration without external resistors, preserving layout simplicity and matching integrity. The AD8276BRMZ pin function table (Table 6) and Theory of Operation section detail these configurations.