MAX3800UHJ-TG002

Overview

The MAX3800UHJ-TG002 is a +3.3V adaptive cable equalizer and cable driver integrated on a single chip, designed for coaxial and twin-axial point-to-point communications. It supports data rates up to 3.2Gbps and automatically adjusts to skin-effect attenuation of up to 30dB at 1.6GHz. The device features differential CML inputs and outputs with adjustable output amplitude. It consumes 200mW at +3.3V and operates within a temperature range of 0°C to +85°C in a 32-pin TQFP package with an exposed pad.

Feature Summary

• Adaptive equalization automatically compensates for copper cable attenuation up to 30dB at 1.6GHz.
• Integrated cable driver with adjustable output amplitude controlled by an external resistor.
• Includes loss-of-signal (LOS) indicator and cable integrity monitor (CIM) outputs.
• Features on-chip input and output terminations to minimize external component count.

Applications

• High-speed links in communications and data systems
• Backplane and interconnect applications
• SDH/SONET transmission equipment

Procurement Notes

Verify the specific suffix 'TG002' against official manufacturer documentation, as standard listings typically use 'UHJ' or 'UHJ+T'. Confirm lead-free status and RoHS compliance requirements for your assembly process. Ensure the 32-TQFP-EP package footprint matches your PCB design guidelines.

Selection Notes

Select this component for high-speed serial links requiring automatic equalization over varying copper cable lengths. It is suitable for applications needing both signal driving and receiving capabilities on one chip. Consider the 200mW power dissipation and thermal management requirements associated with the exposed pad package.

Part Context

The MAX3800 is part of Maxim Integrated's high-speed interface portfolio, specifically targeting gigabit-per-second signaling over copper media. It addresses signal integrity issues caused by skin effect in cables, extending usable link distances without complex external equalization circuits.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing system designs if considering alternative equalizers from other manufacturers.

FAQ

How is the cable driver output amplitude adjusted?

The output amplitude is adjusted by connecting a resistor between the RMOD pin and ground. A resistance value between 10kΩ and 20kΩ allows adjustment of the typical output voltage range from 450mV to 870mV.

What does the Cable Integrity Monitor (CIM) indicate?

The CIM output provides an analog current proportional to the amount of equalization being applied by the internal feedback loop. It can be used to monitor cable length and type characteristics.

How does the Loss-of-Signal (LOS) output function?

The LOS output goes low when the equalizer input signal power drops below a threshold, indicating a broken cable, defective driver, or lost connection. It goes high when sufficient input voltage is present.