Analog Devices Inc. AD8274ARZ

Overview

AD8274ARZ from Analog Devices is a precision difference amplifier optimized for low-distortion signal conditioning in high-fidelity measurement and conversion systems. It delivers 0.00025% THD+N at 20 kHz, 83 dB minimum CMRR, ±2.5 V to ±18 V dual-supply operation, and supports fixed gains of ½ or 2 without external components - ideal for ADC driver and industrial voltage monitoring applications.

For engineers reviewing the AD8274ARZ datasheet, AD8274ARZ pinout, AD8274ARZ application, or AD8274ARZ equivalent, key selection criteria include gain accuracy (0.03% max), distortion performance under 600 Ω load, rail-to-rail input voltage range beyond supplies, and SOIC-8 packaging compatibility with industrial temperature operation (−40°C to +85°C).

Technical Context

The AD8274ARZ integrates a proprietary iPolar® process op amp with laser-trimmed thin-film resistors to achieve matched ratio accuracy critical for CMRR and gain stability. Its resistor-divider architecture enables input common-mode voltages up to ±40 V beyond supply rails while maintaining 77–92 dB CMRR over frequency.

It operates as a fully differential difference amplifier with internal 6 kΩ and 12 kΩ resistors configured for G = ½ or G = 2. The device avoids unity-gain instability by design, requiring noise gain ≥1.5, and achieves 20 V/μs slew rate with 800 ns settling to 0.01% into 100 pF.

Key Specifications

Pinout & Package

AD8274ARZ is housed in an 8-lead SOIC_N package (JEDEC MS-012-AA compliant, 1.27 mm pitch). Dimensions: 5.00 mm × 3.99 mm × 1.75 mm. Thermal resistance θ_JA = 121°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8273ARZ and INA149IDR, the AD8274ARZ uniquely balances ultra-low distortion (0.00025% THD+N), high slew rate (20 V/μs), and rail-over input capability in a single-channel, low-power SOIC-8 solution - making it optimal for precision ADC drivers and high-fidelity industrial signal conditioning where speed and linearity are critical.

Availability

AD8274ARZ is available at Aetrix Electronics and suitable for industrial automation, test and measurement instrumentation, and high-resolution data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD8274ARZ 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, with decades of expertise in precision amplifiers and data conversion technologies.

The AD8274ARZ belongs to Analog Devices' precision difference amplifier product line, designed specifically for high-accuracy, low-distortion signal conditioning in industrial, instrumentation, and audio applications where gain stability and CMRR are critical.

FAQ

What gain configurations does the AD8274ARZ support without external components?

The AD8274ARZ supports fixed gain-of-½ and gain-of-2 configurations using only its internal laser-trimmed 6 kΩ and 12 kΩ resistors. No external components are required for these standard difference amplifier modes. Configurations for gains of −2, +1.5, or +3 are possible with external connections but require careful layout to preserve matching and stability - the AD8274ARZ datasheet Figure 40–47 details all valid wiring schemes.

Can the AD8274ARZ operate from a single supply?

Yes, the AD8274ARZ supports unbalanced supplies - for example, 0 V and +20 V - as long as the total supply voltage does not exceed 36 V. Its input common-mode range extends to −VS + 40 V and +VS − 40 V, enabling operation with ground-referenced inputs even on single-supply rails. However, output swing remains limited to −VS + 1.5 V and +VS − 1.5 V, so proper headroom must be maintained.

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

The AD8274ARZ drives up to 1200 pF with G = ½ and no resistive load, and up to 200 pF with G = 2 under the same conditions. When driving 600 Ω in parallel with capacitance, stability limits reduce to 100 pF (G = 2) and 600 pF (G = ½). For cable driving, Analog Devices recommends adding a ≥20 Ω series resistor at the output to dampen potential peaking - this is documented in Figure 48 of the AD8274ARZ datasheet.

How does the AD8274ARZ achieve rail-over input capability?

The AD8274ARZ achieves rail-over input capability through its internal resistor-divider architecture: input signals are attenuated by the on-chip 12 kΩ/6 kΩ networks before reaching the op amp's input terminals, which themselves are constrained to stay within 1.5 V of either supply rail. This allows the pins to accept voltages up to +VS − 40 V or −VS + 40 V - for example, ±30 V on ±10 V supplies - while protecting the core amplifier and preserving CMRR.

Is the AD8274ARZ RoHS compliant and qualified for industrial temperature operation?

Yes, the AD8274ARZ is RoHS compliant (denoted by the "Z" suffix) and fully specified over the industrial temperature range of −40°C to +85°C. All electrical parameters - including gain error, CMRR, THD+N, and offset voltage - are guaranteed across this range. The device uses qualified materials and undergoes extended reliability testing per Analog Devices' industrial-grade qualification standards.