Analog Devices Inc. ADA4891-4ARZ

Overview

ADA4891-4ARZ 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%, 0.05% differential gain error, and operates from 2.7 V to 5.5 V single supply - enabling high-fidelity signal conditioning in automotive infotainment and contact image sensor buffers.

For engineers reviewing the ADA4891-4ARZ datasheet, ADA4891-4ARZ pinout, ADA4891-4ARZ application, or ADA4891-4ARZ equivalent, this page provides verified specifications, package-confirmed pin functions, real-world use cases in video reconstruction and coaxial cable driving, and validated alternative options for design continuity and sourcing resilience.

Technical Context

The ADA4891-4ARZ implements a fully differential-capable, unity-gain-stable voltage-feedback architecture with true single-supply operation - input common-mode range extends 300 mV below the negative rail, and output swings within 50 mV of both rails. Its 3.2 pF input capacitance and 5 GΩ input resistance support stable interface with photodiodes and high-impedance sources.

Designed for low-distortion wideband performance, it achieves 79 dBc SFDR at 1 MHz and maintains 25 MHz 0.1 dB gain flatness (G = +2, RL = 150 Ω), meeting NTSC video fidelity requirements. The quad configuration shares no internal power-down control - unlike the ADA4891-3, the ADA4891-4ARZ lacks PD pins and operates continuously per channel.

Key Specifications

Pinout & Package

The ADA4891-4ARZ is housed in a 14-lead SOIC_N (R-14) package with standard pin spacing and thermal pad omitted. Pin assignments are confirmed per Figure 5 of Rev. F datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADA4897-4ARZ and LMH6629MQX/NOPB, the ADA4891-4ARZ uniquely balances 220 MHz bandwidth, rail-to-rail output, sub-5 mA per amplifier consumption, and −40°C to +125°C qualification - making it the optimal choice for cost-sensitive, thermally demanding, single-supply imaging front-ends.

Availability

ADA4891-4ARZ is available at Aetrix Electronics and suitable for automotive infotainment systems, contact image sensor interfaces, and coaxial cable driver designs requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for ADA4891-4ARZ 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 imaging and video systems - delivering automotive-qualified performance without premium pricing.

FAQ

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

The ADA4891-4ARZ is specified to operate from −40°C to +125°C, meeting AEC-Q100 Grade 1 requirements for automotive under-hood applications. This rating is confirmed in Table 1 and Table 2 of the Rev. F datasheet and applies across the full supply range (2.7 V to 5.5 V). The ADA4891-4ARZ maintains 220 MHz bandwidth and 28 ns settling time within this range.

Does the ADA4891-4ARZ support dual-supply operation?

Yes, the ADA4891-4ARZ supports dual-supply operation with ±2.5 V typical, as shown in Figure 38 and Figure 39 of the Rev. F datasheet. Its input common-mode range extends to −VS − 0.3 V, and output swings to within 50 mV of both rails - enabling symmetric signal handling. However, the device is optimized for single-supply use, and all guaranteed specifications are published for 2.7 V to 5.5 V operation.

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

No - the ADA4891-4ARZ uses a 14-lead SOIC_N package with dedicated pins for four independent amplifiers, while the ADA4891-1 (8-lead SOIC or 5-lead SOT-23) and ADA4891-2 (8-lead SOIC or MSOP) have different pin counts and layouts. Pin compatibility exists only between ADA4891-3 and ADA4891-4 (both 14-lead), but ADA4891-3 includes power-down pins (PD1–PD3) absent in ADA4891-4ARZ.

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

Analog Devices recommends placing a 0.1 μF ceramic capacitor between +VS (Pin 4) and −VS (Pin 11), located as close as possible to the device. For noisy environments, add a 4.7 μF tantalum or ceramic bulk capacitor in parallel. This configuration is validated in the Layout, Grounding, and Bypassing section (Page 21) and ensures stable 220 MHz operation by suppressing supply-induced gain peaking and oscillation.

Can the ADA4891-4ARZ drive a 150 Ω load at 2 V_p-p while maintaining video specifications?

Yes - the ADA4891-4ARZ delivers 125 mA linear output current and achieves 0.05% differential gain error and 0.25° differential phase error when driving 150 Ω loads at 2 V_p-p (G = +2, VS = 5 V), as measured per NTSC standards in Table 1. Its 170 V/μs slew rate prevents distortion on 3.58 MHz chroma bursts, and 25 MHz 0.1 dB gain flatness preserves luminance bandwidth.