Analog Devices Inc./Maxim Integrated MAX4444ESE

Overview

MAX4444ESE from Maxim Integrated is an ultra-high-speed, low-distortion differential-to-single-ended line receiver with internally fixed +2V/V gain, ±5V dual supply operation, 550MHz small-signal bandwidth, 5000V/µs slew rate, and active-high enable control-designed for high-fidelity video signal conditioning in twisted-pair to coaxial conversion systems.

For engineers reviewing the MAX4444ESE datasheet, MAX4444ESE pinout, MAX4444ESE application, or MAX4444ESE equivalent, key selection criteria include its guaranteed 0.07% differential gain error and 0.05° phase error at NTSC frequencies, 25nV/√Hz input voltage noise at 100kHz, -60dB SFDR at 5MHz, and 16-pin narrow SO package compatibility with high-speed layout requirements.

Technical Context

The MAX4444ESE implements a three-op-amp instrumentation amplifier architecture with symmetrical differential inputs (IN+, IN−) and single-ended output (OUT), referenced to REF and enabled via EN. It uses current-feedback topology to achieve 550MHz bandwidth while maintaining 5000V/µs slew rate under ±5V supplies.

Its internal fixed-gain configuration eliminates external gain-setting components, ensuring stable +2V/V closed-loop performance across temperature (±0.003%/°C gain-error drift) and load conditions (±3.7V swing into 100Ω). CMRR exceeds 55dB and PSRR exceeds 70dB at DC, supporting high common-mode rejection in noisy video transmission environments.

Key Specifications

Pinout & Package

MAX4444ESE is housed in a 16-pin narrow SO (SOIC-N) package with exposed pad not present; thermal dissipation relies on PCB copper area per JEDEC MS-012. Pin functions are validated per Maxim's official pin description table and typical operating circuit.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential-to-single-ended receiver applications.

Compared with MAX4445ESE, MAX4444ESE provides guaranteed +2V/V gain without external resistors and superior NTSC differential gain/phase specs; versus THS4509IDGKT, it offers integrated enable, lower quiescent current, and optimized video distortion performance-but at reduced bandwidth.

Availability

MAX4444ESE is available at Aetrix Electronics and suitable for broadcast video infrastructure, high-speed data acquisition systems, and medical imaging equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX4444ESE 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 medical applications.

The MAX4444ESE belongs to Maxim's ultra-high-speed amplifier product line, engineered specifically for low-distortion differential signal reception in video, instrumentation, and RF signal-chain applications.

FAQ

What is the maximum load capacitance the MAX4444ESE can drive without instability?

The MAX4444ESE is characterized for stable operation with capacitive loads up to 100pF when used with a recommended isolation resistor (RISO). Per Figure 2 and MAX4444toc27, RISO values between 10Ω and 24Ω maintain phase margin above 45° for 10–100pF loads. Driving >100pF without RISO risks ringing or oscillation due to reduced phase margin, especially at high frequencies. For reliable design, always include RISO per Maxim's application note AN5004.

Does the MAX4444ESE require external gain-setting resistors?

No, the MAX4444ESE does not require external gain-setting resistors. It features an internally fixed closed-loop gain of +2V/V, unlike the MAX4445ESE which uses pins 4 and 5 (RG) for external gain configuration. This internal gain simplifies PCB layout, improves temperature stability (±0.003%/°C gain-error drift), and guarantees performance without resistor tolerance or parasitic effects-making MAX4444ESE ideal for production-critical video applications.

What is the common-mode input voltage range for the MAX4444ESE?

The MAX4444ESE supports a common-mode input voltage range of -2.9V to +2.9V when operated from ±5V supplies. This range is specified in the DC Electrical Characteristics table and ensures robust operation with typical differential video signals referenced to 0V. Exceeding this range may degrade CMRR or cause clipping; for wider common-mode ranges, consider the MAX4445ESE with external gain configuration and adjusted biasing.

How does the enable function affect output impedance in shutdown mode?

When the EN pin is driven low, the MAX4444ESE enters low-power disable mode and its output impedance rises to approximately 1.8kΩ. This high-impedance state isolates the output from downstream circuitry, preventing loading or signal contention in multi-channel systems. The 3.5mA quiescent current reflects internal bias reduction-not complete power-down-so REF and supply rails must remain active. Full re-enable time is 80ns (tSHDN(ON)), enabling rapid channel switching in video routers.

Can the MAX4444ESE drive a 75Ω coaxial cable directly?

Yes, the MAX4444ESE can drive a 75Ω coaxial cable directly. Its output delivers ±3.7V into a 100Ω load and maintains >120mA output current capability, exceeding the 66.7mA required for ±5V into 75Ω. To minimize reflections and ensure impedance matching, use a series 75Ω termination at the source (MAX4444ESE output) and avoid stubs or unterminated branches. Layout best practices-including ground plane continuity and short traces-must be followed to preserve signal integrity at 550MHz.