Analog Devices Inc. AD8277ARZ-R7

Overview

AD8277ARZ-R7 from Analog Devices is a dual-channel, unity-gain difference amplifier optimized for precision current and voltage monitoring in low-power, wide-supply industrial and portable systems. It delivers 86 dB minimum 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 single supplies (2.0 V to 36 V) or dual supplies (±2 V to ±18 V).

For engineers reviewing the AD8277ARZ-R7 datasheet, AD8277ARZ-R7 pinout, AD8277ARZ-R7 application, or AD8277ARZ-R7 equivalent, this device is selected for high-accuracy signal conditioning where rail-to-rail input common-mode range, rugged input overvoltage protection (±40 V beyond rails), and ultra-low quiescent current (200 μA per channel) are critical.

Technical Context

The AD8277ARZ-R7 integrates two matched difference amplifier channels on a single die, each with laser-trimmed 40 kΩ thin-film resistors enabling precise G = 1 operation without external components. Its internal op amps are not directly accessible-inputs are routed exclusively through the trimmed resistor network, minimizing parasitic capacitance and preserving CMRR stability up to 10 kHz.

This architecture enables input common-mode voltages extending to −2(V_S + 0.1) V and +2(V_S − 1.5) V, supported by on-chip ESD diodes that provide ±40 V absolute input overvoltage tolerance relative to supply rails. The device is unity-gain stable and supports reference-biased output configurations via dedicated REFA/REFB pins.

Key Specifications

Pinout & Package

AD8277ARZ-R7 is housed in a 14-lead SOIC package (R-14) with standard JEDEC outline, RoHS-compliant matte tin lead finish, and θ_JA = 105°C/W on a 4-layer board. Pin 1 is marked with a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8276ARZ-R7, AD8277ARZ-R7 provides independent dual-channel operation with per-channel sense and reference control, enabling simultaneous current and voltage monitoring without crosstalk. Against INA149IDR, it trades 14 dB CMRR and 50 kHz bandwidth for 83% lower quiescent power and extended 2.0 V single-supply capability.

Availability

AD8277ARZ-R7 is available at Aetrix Electronics and suitable for industrial automation, battery management, and portable medical instrumentation requiring stable component supply across long production lifecycles.

Supply support for AD8277ARZ-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 AD8277ARZ-R7 belongs to Analog Devices' precision difference amplifier product line, engineered specifically for low-power, high-CMRR signal conditioning in current sensing, voltage monitoring, and instrumentation applications where supply flexibility and ruggedness are mandatory.

FAQ

What is the maximum input common-mode voltage for AD8277ARZ-R7 when operating on a +24 V single supply?

With a +24 V single supply (−VS = 0 V), the AD8277ARZ-R7 supports an input common-mode range from −0.1 V to +46.5 V, calculated as −2(V_S + 0.1) V = −0.2 V and +2(V_S − 1.5) V = +45 V, bounded by absolute maximum ratings of −VS + 40 V = +40 V and +VS − 40 V = −16 V. The practical limit is +40 V, confirmed in the Absolute Maximum Ratings table. This allows direct measurement across 24 V bus shunts without attenuation.

Can AD8277ARZ-R7 drive a 10 kΩ load while maintaining specified accuracy over temperature?

Yes. AD8277ARZ-R7 specifies output voltage swing of −VS + 0.2 V to +VS − 0.2 V into 10 kΩ at ±15 V supplies and −VS + 0.15 V to +VS − 0.15 V at 2.7 V single supply, verified across −40°C to +85°C. Load regulation error remains <0.01% for 10 kΩ, and the device's 130 dB channel separation prevents inter-channel loading effects. No external buffer is required for standard ADC interfacing.

How does the SENSE pin (e.g., SENSEA) function in AD8277ARZ-R7, and is it required for stability?

The SENSEA pin provides Kelvin connection to the output node, allowing the internal feedback loop to compensate for voltage drop across PCB traces or output filter components. It is required for stable operation with capacitive loads ≥100 pF. Omitting SENSEA connection degrades phase margin and may cause ringing or oscillation, especially when driving ADC input filters. SENSEA must be routed adjacent to OUTA with minimal trace length.

Is AD8277ARZ-R7 suitable for bidirectional current sensing, and how is polarity handled?

Yes. AD8277ARZ-R7 supports bidirectional current sensing via its differential input structure: connecting +IN and −IN across a shunt places positive current flow at +IN relative to −IN, producing positive output voltage referenced to REFA/REFB. Reversing shunt orientation flips polarity. The device's symmetric input impedance (40 kΩ differential, 40 kΩ common-mode) ensures equal gain magnitude for both directions, and B-grade drift specs guarantee consistent accuracy across polarity transitions.

What packaging and environmental specifications apply to AD8277ARZ-R7?

AD8277ARZ-R7 is supplied in a 14-lead SOIC package (R-14) with RoHS-compliant matte tin leads, specified for operation from −40°C to +85°C ambient temperature. It meets JEDEC MS-012 standards, has a glass transition temperature (T_G) of 150°C, and supports reflow soldering per J-STD-020. Moisture sensitivity level is MSL3, requiring bake-out if exposed to ambient >30°C/60% RH for >168 hours before assembly.