Analog Devices Inc. ADA4891-2ARZ-R7

Overview

ADA4891-2ARZ-R7 from Analog Devices is a dual, CMOS, rail-to-rail output, high-speed voltage feedback amplifier optimized for video, imaging, and active filter applications. It delivers 220 MHz −3 dB bandwidth (G = +1), 170 V/µs slew rate, 28 ns settling to 0.1%, and operates from 2.7 V to 5.5 V single supply with output swing within 50 mV of rails.

For engineers reviewing the ADA4891-2ARZ-R7 datasheet, ADA4891-2ARZ-R7 pinout, ADA4891-2ARZ-R7 application, or ADA4891-2ARZ-R7 equivalent, key selection criteria include video-grade distortion performance (0.05% differential gain error), low 4.4 mA per amplifier quiescent current, −40°C to +125°C automotive-grade temperature range, and SOIC-8 package compatibility with standard PCB layouts.

Technical Context

The ADA4891-2ARZ-R7 employs a voltage-feedback architecture with true single-supply operation and input common-mode range extending 300 mV below the negative rail. Its rail-to-rail output stage supports full dynamic range in 3 V and 5 V systems, while internal compensation ensures stability driving 150 Ω coaxial loads and capacitive loads up to 47 pF without external isolation.

It features matched dual amplifiers with <6 µV/°C offset drift, 5 GΩ input resistance, and 3.2 pF input capacitance - enabling precision DC-coupled signal conditioning and high-frequency AC performance simultaneously. No power-down functionality is present, distinguishing it from the ADA4891-3 variant.

Key Specifications

Pinout & Package

ADA4891-2ARZ-R7 is housed in an 8-lead SOIC_N (R-8) package with exposed pad (RoHS-compliant, Pb-free). Pin 1 is marked by a notch or dot; pins are not internally connected to substrate or thermal pad unless specified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed amplifier applications.

Compared with ADA4891-2ARMZ, ADA4891-2ARZ-R7 offers lower thermal resistance and easier hand-soldering; compared with LMH6629MA/NOPB, it provides rail-to-rail output and 2.8× lower power at the cost of bandwidth - making it optimal for video, imaging, and power-sensitive high-speed analog signal chains.

Availability

ADA4891-2ARZ-R7 is available at Aetrix Electronics and suitable for automotive infotainment systems, consumer video equipment, and industrial imaging modules requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for ADA4891-2ARZ-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 Wilmington, MA.

The ADA4891 family was designed specifically for cost-sensitive, high-speed analog signal conditioning in automotive, consumer video, and imaging applications - emphasizing rail-to-rail operation, low power, and video-grade linearity in standard packages.

FAQ

What is the maximum capacitive load the ADA4891-2ARZ-R7 can drive stably?

The ADA4891-2ARZ-R7 maintains stability driving up to 47 pF capacitive loads without external isolation components, as verified in Figure 27 of the Rev. F datasheet. This capability enables direct connection to long traces, connectors, or ADC input capacitance without added series resistance - critical for maintaining signal integrity in high-speed imaging and video routing. Always use local 0.1 µF ceramic bypass capacitors between +VS and –VS pins.

Does the ADA4891-2ARZ-R7 support dual-supply operation?

Yes, the ADA4891-2ARZ-R7 supports dual-supply operation with ±2.5 V typical (±2.75 V absolute max), as confirmed by its input common-mode range of −VS − 0.3 V to +VS − 0.8 V and output swing specification. The device functions identically in dual- and single-supply modes - making it suitable for legacy ±5 V systems or modern 3.3 V/0 V configurations. No configuration pins or external components are required to switch modes.

Is the ADA4891-2ARZ-R7 pin-compatible with other members of the ADA4891 family?

No, the ADA4891-2ARZ-R7 (SOIC-8) is not pin-compatible with the ADA4891-1 (SOIC-8/SOT-23-5), ADA4891-3 (SOIC-14/TSSOP-14), or ADA4891-4 (SOIC-14/TSSOP-14). While all share identical amplifier core performance, their pinouts differ significantly - especially regarding power pin placement and absence of power-down pins on the dual version. PCB layout must be specific to ADA4891-2ARZ-R7.

What is the typical harmonic distortion performance of the ADA4891-2ARZ-R7 at 1 MHz?

At 1 MHz, the ADA4891-2ARZ-R7 achieves −79 dBc second-harmonic distortion and −93 dBc third-harmonic distortion with 2 V p-p output at G = +1 (5 V supply), per Table 1. This ultra-low distortion supports high-fidelity signal chains in medical imaging, test equipment, and professional video where spectral purity is essential. Performance degrades slightly at lower supplies (e.g., −70/−89 dBc at 3 V), remaining well within broadcast video requirements.

Can the ADA4891-2ARZ-R7 be used in photodiode transimpedance applications?

Yes, the ADA4891-2ARZ-R7 is suitable for photodiode preamplification due to its low 50 pA max input bias current, 9 nV/√Hz input voltage noise at 1 MHz, and high 220 MHz gain-bandwidth product. When configured as a transimpedance amplifier with appropriate feedback resistor and capacitor, it supports fast-response optical sensing in smoke detectors, pulse oximeters, and industrial position sensors - provided layout minimizes stray capacitance at the inverting input.