Analog Devices Inc. AD8274ARZ-R7

Overview

AD8274ARZ-R7 from Analog Devices is a precision difference amplifier with fixed gains of ½ or 2, delivering 0.00025% THD+N at 20 kHz, 83 dB minimum CMRR, and 700 µV maximum offset voltage. It drives 600 Ω loads and operates from ±2.5 V to ±18 V supplies, making it ideal for high-fidelity ADC driver and industrial signal conditioning applications.

For engineers reviewing the AD8274ARZ-R7 datasheet, AD8274ARZ-R7 pinout, AD8274ARZ-R7 application, or AD8274ARZ-R7 equivalent, this page provides verified specifications, SOIC-8 pin mapping, gain configuration details, distortion performance at audio and RF frequencies, and validated alternative options for precision difference amplification in measurement and instrumentation systems.

Technical Context

The AD8274ARZ-R7 integrates a proprietary iPolar® process op amp with laser-trimmed thin-film resistors to achieve matched ratio accuracy, enabling stable G = ½ or G = 2 operation without external components. Its resistor-divider architecture allows input common-mode voltages beyond supply rails-up to ±40 V relative to either rail-while maintaining 83 dB CMRR and 0.03% gain error.

It delivers 20 V/µs slew rate, 800 ns to 0.01% settling time, and −106 dBu noise floor (20 kHz BW), supporting high-speed, low-distortion signal acquisition. The device is internally compensated for noise gains ≥1.5 and is not suitable for unity-gain configurations.

Key Specifications

Pinout & Package

AD8274ARZ-R7 is housed in an 8-lead SOIC_N (R-8) package, RoHS-compliant, with 1.27 mm lead pitch and JEDEC MS-012-AA outline. Pin 8 is NC (no connect); all other pins are electrically active and functionally defined per Analog Devices Rev. C datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8274ARZ-R7, AD8273ARZ-R7 offers channel density at the cost of layout redesign, while INA149IDR trades distortion performance for superior CMRR - making AD8274ARZ-R7 the optimal choice for applications demanding simultaneous low THD+N, fast settling, and rail-extended input range.

Availability

AD8274ARZ-R7 is available at Aetrix Electronics and suitable for precision ADC driver, high-fidelity audio interface, and industrial instrumentation applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AD8274ARZ-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 AD8274ARZ-R7 belongs to Analog Devices' precision difference amplifier product line, designed specifically for high-accuracy, low-distortion signal conditioning in industrial, test & measurement, and audio systems where laser-trimmed resistor matching and extended input voltage range are essential.

FAQ

What gain configurations does the AD8274ARZ-R7 support without external components?

The AD8274ARZ-R7 supports two fixed gain configurations without external components: G = ½ and G = 2. These are implemented using its internal laser-trimmed 6 kΩ and 12 kΩ resistor network. Pin wiring determines the mode - for example, connecting SENSE (Pin 5) to OUT (Pin 6) and −IN (Pin 2) to input sets G = ½. The AD8274ARZ-R7 datasheet Figure 40 and Figure 41 provide exact connection diagrams. Other gains (e.g., −2, +1.5, +3) are possible but require specific pin interconnections and are not default factory-configured states.

Can the AD8274ARZ-R7 operate with single-supply voltages?

Yes, the AD8274ARZ-R7 supports unbalanced supplies - for example, 0 V and +20 V - as long as the total supply differential remains ≤36 V. Its input voltage range extends to −VS + 40 V and +VS − 40 V, enabling true single-supply operation with rail-to-rail input capability beyond the supply rails. However, output swing remains limited to approximately −VS + 1.5 V to +VS − 1.5 V, so proper level-shifting and reference biasing (e.g., via REF pin) are required for AC-coupled single-supply use cases.

What is the maximum capacitive load the AD8274ARZ-R7 can drive stably?

The AD8274ARZ-R7 is characterized to drive up to 1200 pF with a 600 Ω resistive load (Figure 26), but stability depends on gain configuration and load type. At G = ½ with no resistive load, overshoot exceeds 10% beyond 200 pF (Figure 23). For reliable operation, Analog Devices recommends limiting capacitive load to ≤200 pF when driving unterminated cables, and always using a series isolation resistor ≥20 Ω between AD8274ARZ-R7 OUT and the load (Figure 48). Larger capacitive loads require careful compensation per the "Driving Cabling" section of the AD8274ARZ-R7 datasheet.

How does the AD8274ARZ-R7 achieve input voltages beyond the supply rails?

The AD8274ARZ-R7 achieves input voltages beyond the supply rails through an internal resistor divider network - specifically, 12 kΩ and 6 kΩ thin-film resistors that attenuate input signals before they reach the core op amp. This allows differential inputs up to ±40 V relative to either supply rail (e.g., −VS + 40 V or +VS − 40 V), provided the internal op amp's input nodes stay within 1.5 V of the rails. This architecture enables direct measurement of high-voltage industrial signals without external attenuation, preserving SNR and minimizing component count in front-end designs.

Is the AD8274ARZ-R7 pin-compatible with other Analog Devices difference amplifiers like the AD8273?

No, the AD8274ARZ-R7 is not pin-compatible with the AD8273ARZ-R7. Although both are 8-lead SOIC devices, their pin functions differ significantly - for example, AD8274ARZ-R7 uses Pin 1 as REF and Pin 5 as SENSE, whereas AD8273ARZ-R7 assigns different roles to these pins to support dual-channel operation. Swapping them without board revision will result in incorrect gain configuration, loss of common-mode rejection, or functional failure. Always consult the respective pin configuration diagrams (AD8274 Rev. C Figure 4 vs. AD8273 Rev. D Figure 3) before substitution.