GX76476-DNT

Overview

The GX76476-DNT is a quad-channel linear driver chip manufactured by Renesas Electronics Corporation. Designed for optical integrated transmitter small form factor (SFF) modules in metro and long-haul applications, it integrates four driver lanes with SPI circuitry on a single die. The device supports data rates up to 128 GBaud for advanced multi-level QAM modulation systems. Each channel features a 100Ω differential AC-coupled input and a 60Ω differential interface with an open-collector output stage, delivering a linear output voltage of 4.0Vppd suitable for silicon photonics modulators.

Feature Summary

• Integrates quad-lane drivers with SPI circuitry for DC controls on a single die
• Features analog control for gain and output voltage setting with analog monitor capabilities
• Provides peaking adjustment functionality to optimize signal integrity
• Complies with Optical Internetworking Forum (OIF) standards via SPI digital interface

Applications

• 400G/600Gbps 16QAM/64QAM advanced multi-level modulation systems
• High-bandwidth small form factor optical integrated modules
• Metro and long-haul optical transmission networks

Procurement Notes

Verify the specific suffix DNT against official Renesas documentation to confirm package type and tape-and-reel specifications. Confirm current production status as optical driver portfolios undergo frequent lifecycle transitions. Ensure compatibility with existing PCB footprints and thermal management requirements before procurement.

Selection Notes

Select this component for designs requiring high linearity and low inter-channel crosstalk in dense optical transceivers. Evaluate the 4.0Vppd output swing against the specific drive requirements of the target silicon photonics modulator. Consider the integration of SPI controls for simplified system architecture compared to discrete driver solutions.

Part Context

The GX76476 belongs to Renesas' portfolio of optical modulator drivers aimed at high-speed data center and telecommunications infrastructure. It complements other series members like the GX76470 and GX79474, which offer varying output voltages and interface types to address different modulation formats and module form factors within the 400G and 600G ecosystem.

Replacement Considerations

Publicly confirmed direct substitute part numbers are not available in the provided source material. Engineers should consult Renesas engineering support for qualified alternatives or evaluate the GX76470 or GX79474 if pin-out and electrical parameter differences can be accommodated in the design.