HXT44120-DNG

Overview

The HXT44120-DNG is a single-channel, low-power Linear PAM4 Directly-Modulated Laser (DML) driver designed for Long Reach (LR) optical applications. It supports signaling rates up to 28GBaud or 56Gbps in PAM4 modulation. The device handles complete electrical-to-optical conversion, including CML input with equalization, laser bias and modulation control, and power supervision. It integrates Automatic Power Control (APC), temperature monitoring, and an integrated 12-bit ADC with a 6-channel analog multiplexer front-end. Designed as a directly DC-coupled die for TOSA applications, it reduces discrete component count for compact assemblies.

Feature Summary

• Integrates Automatic Power Control (APC) with transmit and receive power monitor capabilities
• Features a programmable 8-bit laser modulation and bias current control system
• Includes an integrated 12-bit ADC with a 6-channel analog multiplexor front-end
• Supports direct DC-coupled die integration for cost-effective and compact TOSA assemblies

Applications

• Long Reach (LR) optical communication modules
• Directly-Modulated Laser (DML) driver circuits
• Transmitter Optical Sub-Assembly (TOSA) designs

Procurement Notes

Verify the specific suffix 'DNG' against official Renesas documentation to confirm package type, pinout configuration, and calibration status. Ensure compatibility with the intended DFB laser diode specifications regarding bias current and modulation depth requirements. Confirm that the die form factor aligns with the target TOSA assembly process and thermal management design.

Selection Notes

Select this component for applications requiring a single-channel solution for LR optical links operating at 28GBaud or 56Gbps PAM4. It is suitable for designs prioritizing low power dissipation and reduced bill of materials through integrated APC and monitoring functions. Consider its suitability for direct DC-coupling to minimize external components and improve RF performance in compact optical transceiver modules.

Part Context

The HXT44120 belongs to Renesas' family of linear PAM4 DML drivers. It shares functional similarities with other models like the HXT44100 but is tailored for specific power and interface configurations. This series addresses the growing demand for high-speed, energy-efficient optical interconnects in data center and telecommunications infrastructure.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.