Analog Devices Inc. ADA4891-4ARUZ

Overview

ADA4891-4ARUZ from Analog Devices is a quad-channel, rail-to-rail output CMOS high-speed operational 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 time to 0.1%, and rail-to-rail output swing within 50 mV of supply rails at 5 V operation - enabling high-fidelity signal conditioning in automotive infotainment and contact image sensor buffers.

For engineers reviewing the ADA4891-4ARUZ datasheet, ADA4891-4ARUZ pinout, ADA4891-4ARUZ application, or ADA4891-4ARUZ equivalent, key selection criteria include its 14-lead TSSOP package, 2.7 V to 5.5 V single-supply operation, −40°C to +125°C automotive-grade temperature range, and verified performance in coaxial cable driver and photodiode preamp circuits.

Technical Context

The ADA4891-4ARUZ employs a fully differential input stage with 5 GΩ input resistance and 3.2 pF input capacitance, supporting true single-supply operation with input common-mode range extending 300 mV below the negative rail. Its rail-to-rail output stage uses complementary bipolar-CMOS architecture to achieve 125 mA linear output current and <0.1% gain flatness up to 25 MHz (G = +2, RL = 150 Ω).

Designed for low-distortion wideband amplification, it achieves −79 dBc SFDR at 1 MHz and maintains 88 dB CMRR over 0 V to 3.0 V common-mode range. The quad configuration shares no internal power-down functionality (unlike ADA4891-3), and all four amplifiers operate simultaneously with independent inputs and outputs.

Key Specifications

Pinout & Package

The ADA4891-4ARUZ is housed in a 14-lead TSSOP (RU-14) package with exposed pad for thermal enhancement. Pin numbering follows standard JEDEC TSSOP layout, with all four amplifiers sharing common supply rails and independent I/O terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMH6629MA/NOPB and AD8054ARUZ, the ADA4891-4ARUZ uniquely combines automotive temperature rating, rail-to-rail output, and 220 MHz bandwidth at 4.4 mA per channel - making it optimal for space-constrained, single-supply imaging and video systems requiring guaranteed performance across −40°C to +125°C.

Availability

ADA4891-4ARUZ is available at Aetrix Electronics and suitable for automotive infotainment systems, contact image sensor interfaces, and active filter designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADA4891-4ARUZ 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 ADA4891 family was engineered specifically for cost-sensitive, high-speed signal conditioning in automotive, imaging, and consumer video applications - emphasizing rail-to-rail output, low distortion, and robust operation from −40°C to +125°C.

FAQ

What is the maximum operating temperature for the ADA4891-4ARUZ?

The ADA4891-4ARUZ is specified to operate continuously from −40°C to +125°C and is qualified per AEC-Q100 Grade 2. This extended temperature range ensures reliable performance in under-hood automotive environments and industrial imaging enclosures where ambient temperatures exceed 85°C. The device's thermal design supports junction temperatures up to 150°C on standard 4-layer PCBs with proper copper pour and decoupling.

Does the ADA4891-4ARUZ support true single-supply operation?

Yes, the ADA4891-4ARUZ supports true single-supply operation with an input common-mode voltage range extending 300 mV below the negative rail (e.g., −0.3 V when −VS = 0 V) and rail-to-rail output swing within 50 mV of both supply rails. This allows direct interfacing with sensors and ADCs in 3.3 V or 5 V systems without level-shifting circuitry - a key enabler for simplified, low-component-count video and imaging front ends.

What is the recommended power supply bypassing for ADA4891-4ARUZ?

Each +VS (Pin 4) and −VS (Pin 11) connection of the ADA4891-4ARUZ must be bypassed to ground with a 0.1 µF X7R ceramic capacitor placed ≤2 mm from the pin. For high-current or low-noise applications, add a 4.7 µF tantalum or polymer capacitor in parallel. The exposed pad (EP) must be soldered to a solid ground plane to ensure thermal stability and minimize PSRR degradation above 1 MHz.

Can ADA4891-4ARUZ drive 150 Ω video loads directly?

Yes, the ADA4891-4ARUZ is explicitly characterized for 150 Ω video loads: it delivers 0.08 V to 4.90 V output swing, maintains 0.1 dB gain flatness to 25 MHz, and exhibits only 0.05% differential gain and 0.25° differential phase error - meeting broadcast NTSC specifications. Its 125 mA linear output current ensures stable drive into dual-terminated 75 Ω lines (equivalent to 150 Ω load).

Is ADA4891-4ARUZ pin-compatible with other members of the ADA4891 family?

No - the ADA4891-4ARUZ (14-lead TSSOP) is not pin-compatible with the ADA4891-1 (5-lead SOT-23 or 8-lead SOIC) or ADA4891-2 (8-lead SOIC or MSOP). However, it shares identical pin functions and electrical behavior with the ADA4891-3 in the same 14-lead packages (SOIC_N and TSSOP), differing only in channel count (quad vs. triple) and absence of power-down pins.