Analog Devices Inc. AD8279BRZ-R7

Overview

AD8279BRZ-R7 from Analog Devices is a dual-channel, low-power, wide-supply-range difference amplifier with fixed gains of G = ½ and G = 2. It delivers 80 dB CMRR (dc to 20 kHz), 1 MHz bandwidth at G = ½, and operates from ±2 V to ±18 V or 2.0 V to 36 V single supply. Its rugged input overvoltage protection and rail-to-rail input range beyond supplies make it ideal for precision current sensing in industrial power monitoring systems.

For engineers reviewing the AD8279BRZ-R7 datasheet, AD8279BRZ-R7 pinout, AD8279BRZ-R7 application, or AD8279BRZ-R7 equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and packaging differences.

Technical Context

The AD8279BRZ-R7 integrates two matched, laser-trimmed resistor networks per channel to achieve high gain accuracy (0.005% typical gain error) and temperature-stable CMRR (1 ppm/°C gain drift). Its input stage supports common-mode voltages up to ±3× supply rails at G = ½, enabling direct measurement of high-side shunt voltages without level-shifting circuitry.

Each channel features independent SENSE, REF, +IN, −IN, OUT, and supply terminals, allowing flexible configuration as difference amplifiers (G = ½ or 2), inverting/non-inverting amplifiers (gains of −2, −½, +1, +1.5, +2, +3), or differential-output stages. Internal ESD protection and ±40 V input overvoltage tolerance relative to supplies enhance robustness in noisy industrial environments.

Key Specifications

Pinout & Package

AD8279BRZ-R7 is housed in a 14-lead SOIC package (JEDEC MS-012AC) with exposed pad not connected internally. Thermal resistance θJA = 105°C/W on 4-layer board; maximum junction temperature limited to 150°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8276ARZ-R7 and INA199A2DCKR, the AD8279BRZ-R7 uniquely delivers dual-channel operation in one 14-lead SOIC with rail-to-rail input capability beyond supplies, making it the only choice for space-constrained, high-common-mode dual-signal conditioning without layout duplication or external level-shifting.

Availability

AD8279BRZ-R7 is available at Aetrix Electronics and suitable for industrial power monitoring, motor drive current feedback, battery management systems, and portable test equipment requiring stable component supply and long-term manufacturability.

Supply support for AD8279BRZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD8279 belongs to Analog Devices' precision difference amplifier product line, engineered for low-power, high-CMRR signal conditioning in industrial, instrumentation, and energy-monitoring applications where supply flexibility and input ruggedness are critical.

FAQ

What is the maximum common-mode input voltage supported by AD8279BRZ-R7 at G = ½?

The AD8279BRZ-R7 supports an input common-mode voltage range of −3(VS + 0.1) V to +3(VS − 1.5) V when configured for G = ½. With ±15 V supplies, this enables operation from −45.3 V to +40.5 V - sufficient to measure across 48 V bus shunts without external attenuation. This specification is validated in Table 2 and Figure 12 of the AD8279BRZ-R7 datasheet Rev. C.

Can AD8279BRZ-R7 operate from a single 3.3 V supply?

Yes, AD8279BRZ-R7 operates from single supplies as low as 2.0 V. At 3.3 V, it supports G = ½ with 870 kHz bandwidth and 80 dB CMRR (Table 4), and G = 2 with 450 kHz bandwidth and 86 dB CMRR (Table 5). The REF pins must be biased to midsupply (1.65 V), and output swing is specified as −VS + 0.1 V to +VS − 0.15 V, yielding ~0.1 V to 3.15 V usable range.

Does AD8279BRZ-R7 require external resistors for gain setting?

No, AD8279BRZ-R7 does not require external resistors for its standard G = ½ or G = 2 configurations. It integrates laser-trimmed, ratio-matched thin-film resistors (40 kΩ/20 kΩ network per channel) that provide guaranteed gain accuracy of 0.005% typical and 0.05% maximum. External resistors are only needed for nonstandard gains like +3 or −2, as described in the "Configurations" section of the AD8279BRZ-R7 datasheet.

What is the thermal performance of AD8279BRZ-R7 in its 14-lead SOIC package?

The AD8279BRZ-R7 in 14-lead SOIC has a junction-to-ambient thermal resistance (θJA) of 105°C/W on a 4-layer JEDEC board with zero airflow. At maximum dissipation (±15 V supplies, 375 μA/channel), power is ~11.25 mW per channel. Under worst-case ambient (85°C), junction temperature rises by ~1.2°C - well within the 150°C limit. Derating curves are shown in Figure 3 of the AD8279BRZ-R7 datasheet.

How does the SENSE pin function in AD8279BRZ-R7?

The SENSE pin (SENSEA/SENSEB) in AD8279BRZ-R7 connects directly to the amplifier's internal output node to close the feedback loop through the precision laser-trimmed resistor network. It must be connected to the OUT pin for standard G = ½ or G = 2 operation. Leaving SENSE unconnected disables the internal gain-setting network and results in undefined behavior - the AD8279BRZ-R7 will not function correctly without this connection.