Analog Devices Inc. AD8274ARMZ

Overview

AD8274ARMZ 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 in an 8-lead MSOP package - ideal for ADC driver and industrial sensor interface applications.

For engineers reviewing the AD8274ARMZ datasheet, AD8274ARMZ pinout, AD8274ARMZ application, or AD8274ARMZ equivalent, key selection criteria include its laser-trimmed resistor network enabling 0.03% max gain error, 20 V/μs slew rate, 800 ns settling to 0.01%, and rail-overmeasuring capability up to ±40 V beyond supplies.

Technical Context

The AD8274ARMZ integrates a proprietary iPolar® process op amp with four laser-trimmed thin-film resistors (12 kΩ and 6 kΩ) to form a fully differential input stage with precise ratio matching. Its internal architecture eliminates external gain-setting components while guaranteeing 0.5 ppm/°C gain drift and 700 μV max offset voltage over −40°C to +85°C.

It operates as a true difference amplifier with no external feedback required for G = ½ or G = 2 configurations, and supports extended input common-mode range (up to ±40 V beyond rails) via internal resistor division. The device maintains stability for noise gains ≥1.5 and drives 600 Ω loads without external buffering.

Key Specifications

Pinout & Package

AD8274ARMZ uses an 8-lead MSOP (RM-8) package with exposed pad (not electrically connected). Pin 8 is NC (no connect); all other pins are functional and match SOIC pinout numbering. Thermal resistance θ_JA = 135°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 AD8274ARMZ, AD8273ARZ offers channel density at cost of layout flexibility and power efficiency, while INA149IDR trades distortion performance for enhanced high-CMRR unidirectional sensing - neither matches AD8274ARMZ's combination of ultra-low THD+N, dual-gain configurability, and rail-overmeasuring in MSOP.

Availability

AD8274ARMZ is available at Aetrix Electronics and suitable for precision ADC driver, high-fidelity audio interface, industrial sensor signal conditioning, and resolver encoder interface applications requiring stable component supply across production lifecycles.

Supply support for AD8274ARMZ 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 AD8274ARMZ belongs to Analog Devices' precision difference amplifier product line, designed specifically for applications demanding ultra-low distortion, high CMRR, and rail-overmeasuring capability in compact packages.

FAQ

What gain configurations does the AD8274ARMZ support without external components?

The AD8274ARMZ supports two factory-configured gain options without external components: G = ½ and G = 2 in difference amplifier mode. These are implemented using its internal laser-trimmed 12 kΩ and 6 kΩ resistor network. Additional configurations (e.g., G = −2, G = 1.5) are possible with external wiring but require verifying noise gain ≥1.5 for stability. The AD8274ARMZ datasheet Figure 40–47 details all valid topologies.

Can the AD8274ARMZ measure input voltages outside its supply rails?

Yes, the AD8274ARMZ can measure input voltages up to ±40 V beyond its supply rails (e.g., −VS + 40 V and +VS − 40 V), enabled by its internal resistor divider architecture. For example, with ±10 V supplies, inputs up to ±30 V are supported. This rail-overmeasuring capability eliminates external attenuation networks in industrial sensor interfaces. Absolute maximum ratings must still be observed per Table 3 in the AD8274ARMZ datasheet.

What is the maximum capacitive load the AD8274ARMZ can drive stably?

The AD8274ARMZ is characterized to drive up to 1200 pF with 600 Ω in parallel (Figure 26) and up to 200 pF with no resistive load (Figure 23). For cable driving, Analog Devices recommends placing ≥20 Ω in series with the output to dampen peaking caused by cable capacitance. Stability degrades above 1200 pF unless external compensation is applied, as detailed in the "Driving Cabling" section of the AD8274ARMZ datasheet.

How does the AD8274ARMZ achieve its 0.00025% THD+N specification?

The AD8274ARMZ achieves 0.00025% THD+N at 20 kHz through a combination of Analog Devices' proprietary iPolar® process op amp, laser-trimmed thin-film resistors with <0.01% ratio matching, and optimized internal layout minimizing parasitic capacitance. This architecture reduces harmonic generation from both active devices and passive elements - verified under 10 V_p-p, 600 Ω load conditions per the AD8274ARMZ datasheet Table 2 and Figure 32.

Is the AD8274ARMZ pin-compatible with other Analog Devices difference amplifiers?

No, the AD8274ARMZ is not pin-compatible with other Analog Devices difference amplifiers such as AD8273 or AD8479. Its pinout (REF, −IN, +IN, −VS, SENSE, OUT, +VS, NC) is unique to the AD8274 family and reflects its specific internal resistor topology. Substituting another part requires PCB redesign. Always verify pin function mapping using the AD8274ARMZ datasheet Figures 3 and 4 before layout.