Critical Communications

Semtech unveils new CDR PAM4 receivers and transmitters

09 March 2022

Semtech Corp. has introduced new clock and data recovery (CDR) transmitters and receivers as part of the company’s Tri-Edge product line.

The transmitters include the GN2555 and GN2556 devices that enable next generation data center long reach (LR) optical links. The GN2555 is a quad channel PAM4 CDR with integrated directly modulated laser (DML) drivers and the GN2556 is a quad channel PAM4 CDR with integrated externally modulated laser (EML) drivers.

Both transmitters are compliant to IEEE 802.3bs and Open Eye MSA specifications.

Meanwhile, Semtech’s GN2559S ultra-low power Tri-Edge CDR receiver is designed for next generation data center short reach (SR) and LR optical links.

The GN2559S is a PAM4 receiver with quad PAM4 CDRs and integrated linear transimpedance amplifiers (TIAs). The device offers low latency due to Semtech’s signal integrity platform and a 400 mW power reduction from the previous generation receiver.


Semtech has also begun production of its Tri-Edge CDR with an integrated DML driver for emerging 50 Gbps PAM4 5G front haul deployments.

The GN225 integrated circuit allows wireless system vendors and carriers to upgrade X-haul infrastructures and can advance 5G presence as well as gear up networks for 5.5G deployments in the future.

According to Semtech, 5G infrastructures must go through upgrades to enable new applications that require near zero latency and high data bandwidths. By the end of 2027, 5G subscriptions are expected to reach 4.4 billion, up from 660 million by the end of 2022, according to Ericsson. Data traffic is expected to increase by more than 4.4 times over the same period.

This demand will come from new 5G applications being enabled by the faster speeds and lower latency the technology affords. This includes virtual reality, autonomous vehicles, machine learning and massive internet of things (IoT). It will be essential to upgrade 5G front haul infrastructure to support 50 Gbps PAM4 for millimeter wave (mmWave) rollouts, Semtech said.

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