Analog Devices Inc./Maxim Integrated MAX4225ESA

Overview

MAX4225ESA from Maxim Integrated is a dual-channel, current-feedback operational amplifier optimized for closed-loop gain ≥ +1 (0dB), delivering 1GHz -3dB bandwidth, 1100V/µs slew rate, and 0.01%/0.02° differential gain/phase error. It operates from ±2.85V to ±5.5V dual supplies, draws 6.0mA quiescent current per amplifier, and supports video line driving and ADC input buffering in professional broadcast equipment.

For engineers reviewing the MAX4225ESA datasheet, MAX4225ESA pinout, MAX4225ESA application, or MAX4225ESA equivalent, this page provides verified pin functions, real-world video and data-communications performance metrics, shutdown-mode impedance behavior, and validated alternative options for high-speed analog signal conditioning.

Technical Context

The MAX4225ESA implements a current-feedback topology with transimpedance open-loop transfer function, enabling gain-bandwidth independence at low gains and supporting stable operation with RF = 560Ω for AV = +1 configurations. Its internal architecture features matched input resistances (700kΩ noninverting, 45kΩ inverting) and rail-to-rail output swing capability of ±2.5V into 50Ω loads.

It integrates dual independent amplifiers sharing one 8-pin SO package, each with dedicated IN+, IN-, OUT, VCC, VEE, and SHDN pins - no shared inputs or outputs. Shutdown mode reduces supply current to 350µA and raises output impedance to 100kΩ, enabling multiplexing without external isolation switches.

Key Specifications

Pinout & Package

MAX4225ESA is housed in an 8-pin SO (Small Outline) package with gull-wing leads, rated for -40°C to +85°C operation. Pin 1 is marked with a dot; pin numbering follows standard SO convention (counterclockwise from pin 1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-feedback amplifier applications.

Compared with MAX4226ESA and LMH6720MA/NOPB, the MAX4225ESA uniquely balances 1GHz bandwidth, dual-channel integration, per-amplifier shutdown, and unity-gain optimization - making it the only option that satisfies simultaneous requirements for broadcast video line driving, low-power ADC buffering, and hardware-multiplexed video switching in space-constrained SO-8 layouts.

Availability

MAX4225ESA is available at Aetrix Electronics and suitable for professional video equipment, high-speed data acquisition systems, and telecommunications infrastructure requiring stable component supply across extended temperature ranges (-40°C to +85°C).

Supply support for MAX4225ESA 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and high-speed ICs for demanding industrial, communications, and consumer applications.

The MAX4223–MAX4228 family was engineered specifically for ultra-high-speed video signal conditioning and wideband data communications, emphasizing differential gain/phase accuracy, low distortion, and low-power shutdown for portable and multiplexed systems.

FAQ

What is the operating supply voltage range for the MAX4225ESA?

The MAX4225ESA operates from dual supplies ranging from ±2.85V to ±5.5V. This corresponds to a total supply voltage range of 5.7V to 11V. Operation outside this range violates absolute maximum ratings and may cause permanent damage. The device is specified for full performance across the entire -40°C to +85°C temperature range under these supply conditions. Typical applications use ±5V supplies to maximize output swing and bandwidth.

Does the MAX4225ESA support unity-gain stable operation?

Yes, the MAX4225ESA is explicitly optimized for closed-loop gains of +1 (0dB) or greater, with a guaranteed 1GHz -3dB bandwidth at AV = +1. Its current-feedback architecture eliminates gain-dependent phase margin degradation, allowing stable unity-gain operation without external compensation components. This distinguishes it from the MAX4224/MAX4227/MAX4228 variants, which are compensated for minimum AV = +2.

How does the shutdown mode affect output impedance on the MAX4225ESA?

In shutdown mode (SHDN pin ≤0.8V), the MAX4225ESA output impedance rises to 100kΩ typical per channel. This high-impedance state is electrically isolated from other channels and remains stable across frequency up to 100MHz. It enables direct connection of multiple MAX4225ESA outputs in video multiplexing applications without loading the active channel, achieving >40dB off-isolation at 10MHz as verified in production characterization.

Can the MAX4225ESA drive 75Ω back-terminated video lines?

Yes, the MAX4225ESA is characterized to drive up to four back-terminated 75Ω loads simultaneously while maintaining ±2.5V output swing and preserving differential gain/phase error below 0.01%/0.02°. This capability is validated under RL = 50Ω conditions (equivalent to two parallel 100Ω terminations), confirming robust performance in standard broadcast video distribution topologies.

What is the input bias current specification for the MAX4225ESA at +25°C?

At TA = +25°C, the MAX4225ESA exhibits +2µA typical input bias current at the noninverting input (IN+) and -7µA typical at the inverting input (IN-). These values are confirmed in the DC Electrical Characteristics table and remain within ±15µA over the full -40°C to +85°C operating range. The asymmetry arises from the current-feedback architecture's internal transistor biasing scheme.