Analog Devices Inc. AD8279ARZ

Overview

AD8279ARZ from Analog Devices is a dual-channel, low-power, wide-supply-range difference amplifier with fixed gains of G = ½ and G = 2. It operates from single supplies (2.0 V to 36 V) or dual supplies (±2 V to ±18 V), delivers 1 MHz bandwidth at G = ½, achieves ≥80 dB CMRR up to 20 kHz, and consumes only 300–350 μA per channel - ideal for precision current/voltage monitoring in battery-powered industrial sensors.

For engineers reviewing the AD8279ARZ datasheet, AD8279ARZ pinout, AD8279ARZ application, or AD8279ARZ equivalent, key selection criteria include its rail-to-rail input voltage range beyond supplies (up to ±3×VS), rugged input overvoltage protection, laser-trimmed resistor network for gain accuracy, and dual-channel SOIC-14 package enabling compact differential signal conditioning without discrete resistor matching.

Technical Context

The AD8279ARZ integrates two matched, high-precision difference amplifiers on a single die, each with internal 40 kΩ/20 kΩ resistor networks laser-trimmed for <0.02% gain error and excellent ratio matching. Its input stage supports common-mode voltages extending to −3(VS + 0.1) V and +3(VS − 1.5) V at G = ½, enabling direct measurement of high-side shunt voltages in single-supply systems.

Each channel features independent SENSE, REF, IN+, IN−, OUT, and supply terminals, allowing flexible configuration as independent difference amplifiers or as building blocks for instrumentation amplifiers. The device uses ESD-protected inputs and includes short-circuit current limiting (±15 mA) with thermal shutdown safeguards.

Key Specifications

Pinout & Package

AD8279ARZ is housed in a 14-lead SOIC package (JEDEC MS-012AA, 1.27 mm pitch) with exposed pad not connected internally. Thermal resistance θ_JA = 105°C/W on 4-layer JEDEC board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8276ARZ and INA149IDR, the AD8279ARZ uniquely delivers dual-channel precision amplification in one SOIC-14 package with sub-350 μA/channel consumption and rail-exceeding input range - making it optimal for space-constrained, multi-signal industrial monitoring where isolation is not required.

Availability

AD8279ARZ is available at Aetrix Electronics and suitable for high-reliability current sensing, industrial voltage monitoring, and portable medical diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD8279ARZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD8279ARZ belongs to Analog Devices' precision difference amplifier product line, engineered for low-power, high-CMRR signal conditioning in power-sensitive applications such as battery management, motor control, and portable instrumentation.

FAQ

What is the maximum common-mode input voltage supported by AD8279ARZ at G = ½ with ±15 V supplies?

The AD8279ARZ supports a common-mode input voltage range of −3(VS + 0.1) V to +3(VS − 1.5) V at G = ½. With ±15 V supplies, this yields −45.3 V to +40.5 V - enabling direct measurement of high-side shunt voltages up to 40.5 V above negative rail. This specification is confirmed in Table 2 of the AD8279ARZ datasheet Rev. C, Page 3.

Can AD8279ARZ operate from a single 3.3 V supply, and what performance is guaranteed?

Yes, AD8279ARZ operates from single supplies down to 2.0 V. At 3.3 V, it guarantees G = ½ bandwidth of 870 kHz, CMRR ≥80 dB (0–2.4 V common-mode), output swing of −3.2 V to +3.15 V (vs. rails), and supply current ≤375 μA per channel - all specified in Table 4, Rev. C, Page 5.

How does the SENSE pin function in AD8279ARZ, and why is it critical for current sensing?

The SENSE pin in AD8279ARZ provides a Kelvin connection point for the low-side of the shunt resistor, decoupling output reference from load return path. This eliminates errors caused by PCB trace resistance between shunt and amplifier, ensuring accurate current measurement. Each channel has its own SENSE pin (SENSEA, SENSEB), as defined in Table 9, Rev. C, Page 8.

Is AD8279ARZ RoHS compliant and qualified for industrial temperature range?

Yes, AD8279ARZ is fully RoHS compliant and specified for operation from −40°C to +85°C ambient temperature. Its performance parameters - including offset drift, gain drift, and CMRR - are guaranteed across this full industrial range, as documented in Tables 2–5 and the Ordering Guide, Rev. C, Page 21.

What is the absolute maximum rating for input voltage on AD8279ARZ pins?

The absolute maximum input voltage rating for any AD8279ARZ pin is −VS + 40 V minimum and +VS − 40 V maximum. For example, with ±15 V supplies, inputs may safely tolerate −55 V to +55 V - providing robust protection against transients in harsh industrial environments, per Table 6, Rev. C, Page 7.