Analog Devices Inc./Maxim Integrated MAX3801UGG

Overview

The MAX3801UGG from Maxim Integrated is a +3.3V adaptive cable equalizer IC designed for high-speed coaxial and twin-axial point-to-point interconnects. It supports data rates up to 3.2Gbps, provides 0–30dB equalization at 1.6GHz, features differential CML I/O, integrated LOS and CIM outputs, and operates in 0°C to +85°C ambient temperature.

For engineers reviewing the MAX3801UGG datasheet, MAX3801UGG pinout, MAX3801UGG application, or MAX3801UGG equivalent, key selection criteria include its adaptive skin-effect compensation, low 125mW power dissipation, on-chip 50Ω/62.5Ω terminations, CML interface compatibility, and 24-pin QFN package with exposed thermal pad.

Technical Context

The MAX3801UGG implements a dual-power-detector feedback loop using 200MHz and 600MHz frequency-specific detectors to dynamically adjust equalization gain. Its architecture integrates a CML input buffer, flat-response amplifier, skin-effect compensation amplifier (gain ∝ √f), current-steering network, and CML output buffer with limiting.

It supports both differential and single-ended operation (4–30dB effective equalization range at 1.6GHz for single-ended), includes ESD-protected inputs/outputs, and delivers specified output swing (500–1000mV_P-P) into 50Ω loads referenced to V_CC, with common-mode voltage fixed at V_CC – 0.2V.

Key Specifications

Pinout & Package

The MAX3801UGG is housed in a 24-pin 4mm × 4mm × 0.9mm QFN package with exposed thermal pad (package code G2444-1), requiring soldering of the EP pad to PCB ground for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adaptive equalizer applications.

Compared with MAX3800UTG+, the MAX3801UGG offers identical equalization performance but with a standard-height QFN for improved thermal conduction; versus LMH0384SQ/NOPB, it provides lower-latency analog-only equalization without retiming, making it optimal for deterministic timing-critical interconnects.

Availability

MAX3801UGG is available at Aetrix Electronics and suitable for SDH/SONET transmission equipment, backplane interconnects, and high-speed video surveillance links requiring stable component supply and long-term industrial availability.

Supply support for MAX3801UGG 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for communications, computing, and industrial markets.

The MAX3801UGG belongs to Maxim's high-speed interconnect product line, engineered specifically to extend copper cable reach in telecom, datacom, and broadcast video systems without requiring active retiming or complex configuration.

FAQ

What is the primary function of the MAX3801UGG in a high-speed link?

The MAX3801UGG is an adaptive cable equalizer that restores high-frequency signal integrity degraded by skin-effect losses in copper cables. It automatically adjusts equalization gain from 0dB to 30dB at 1.6GHz to maintain eye opening for data rates up to 3.2Gbps. The MAX3801UGG achieves this using a dual-power-detector feedback loop and delivers differential CML outputs compatible with industry-standard receivers.

Does the MAX3801UGG require external configuration or programming?

No, the MAX3801UGG operates autonomously without registers, I²C interfaces, or external control signals. Its adaptive equalization is fully analog and self-calibrating via internal 200MHz/600MHz power detectors and current-steering circuitry. The MAX3801UGG begins adjusting immediately upon power-up and signal detection, making it plug-and-play for fixed-function interconnects.

How does the Cable Integrity Monitor (CIM) output of the MAX3801UGG work?

The CIM output (pins 5 and 6) provides a differential analog current directly proportional to the equalizer's applied gain. When a 100kΩ resistor is connected from each CIM pin to ground, the resulting voltage indicates real-time equalization effort - higher voltage means greater cable loss compensation. This allows system-level monitoring of cable health without interrupting data flow, and is a unique diagnostic feature of the MAX3801UGG.

Can the MAX3801UGG be used with single-ended signals?

Yes, the MAX3801UGG supports single-ended operation by grounding the unused input through a series capacitor and 50Ω resistor. However, its specifications are optimized for differential CML signaling. In single-ended mode, effective equalization ranges from approximately 4dB to 30dB at 1.6GHz, and performance depends on careful layout to minimize common-mode noise. The MAX3801UGG datasheet explicitly defines differential operation as the primary use case.

What thermal considerations apply to the MAX3801UGG's exposed pad?

The exposed pad (EP) of the MAX3801UGG must be soldered to the PCB ground plane to ensure proper thermal dissipation and electrical stability. With 125mW typical power dissipation, inadequate thermal connection can cause junction temperature rise beyond the 85°C maximum ambient rating. Maxim specifies that the EP serves as both thermal path and low-inductance ground return, and failure to connect it compromises both reliability and high-frequency signal integrity in the MAX3801UGG.