Semtech unveils PAM4 CDR chipset for 100G data centre optical links

Created August 31, 2021
Technologies and Products

Semtech Corporation has announced full production availability of the GN2538 and GN2539, Semtech’s newest Tri-Edge™ CDR chipset, designed to enable next generation data centre interconnectivity over multi-mode fibres. The GN2538 is a dual channel 50G PAM4 CDR with integrated VCSEL drivers. The GN2539 is a dual channel 50G PAM4 CDR with integrated linear transimpedance amplifiers (TIAs). This chipset is the latest addition to the existing Tri-Edge CDR platform, and their low power and ease of implementation will allow major data centres to upgrade their intra-data centre interconnects and enhance overall performance, says Semtech.

The laser driver integrated in the GN2538 includes proprietary VCSEL compensation to enable a wide range of VCSEL options with fully adaptive input equalisation and easy start up, to streamline system bring up. The company says the integrated linear TIA in the GN2559 provides superior receiver performance with reliable adaptation and includes configurable output de-emphasis enabling robust and compliant electrical interfaces.

Semtech observes that the growing need for information has rapidly altered data centre demands with more industries and consumers turning to online processes and activities like streaming, social media, e-commerce and telemedicine. The COVID-19 pandemic has further amplified data consumption and usage trends as more businesses shifted activities online, putting an emphasis on data and compute availability. Semtech’s Tri-Edge SR CDR solutions offer low power and reduced latency to enable seamless data transfer despite growing data rates, while offering lower power dissipation that helps reduce the environmental impact of data centres.

“Our customers have fully tested the solutions confirming interoperability with 100G ports of commercial Ethernet switches used in major data centres. The integration offered by the analogue PAM4 GN2538 and GN2539 chipset enables reduced cost, and delivers the highly desired low power and low latency performance that meets the needs of high-performance computing (HPC), artificial intelligence (AI) and Cloud data centre networks. This chipset is also fully compliant to the 50G per lane multi-mode fiber Open Eye MSA specification,” said Julius Yam, market manager, Data Centre Products in Semtech’s Signal Integrity Products Group.

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This article was written
by Peter Dykes

Peter Dykes is a independent telecoms and technology journalist who has over that last 30 years written for a wide range of B2B publications and companies. A former BT engineer, he specialises in networks and associated support systems. He is currently Editor of Optical Connections.