Overview

The RC38312 is an ultra-low phase noise radio synchronizer, multi-frequency clock synthesizer, and digitally controlled oscillator (DCO). It delivers exceptional performance for 5G radio units (RU), distribution units (DU), and network switches and routers. Its capability to output clocks with ultra-low in-band phase noise and significantly reduced spurious levels enhances the reliability and efficiency of 4G and 5G RF transceivers. The device offers the most margin on reference clock jitter, with up to three synchronization domains and four frequency domains, allowing designers to simplify their overall PCB design and providing a single timing solution supporting both synchronization via CPRI or eCPRI and RF clock generation. It offers low power dissipation and a smaller area while still achieving ultra-low jitter, and maintains ultra-low phase coherence essential for 5G and 5G-A BTS radio unit designs. The RC38312 provides flexibility by allowing locking to external reference clocks or free-running crystals/oscillators and features hitless reference switching to ensure uninterrupted service even when switching between redundant timing sources, making it an ideal choice for ensuring robust, precise timing across telecommunication applications.

RC38312 Block Diagram
RC38312 Block Diagram
  • Ultra-low phase noise synthesizer: Jitter below 18fs RMS from 12kHz to 20MHz with a 4MHz high pass filter (HPF)
  • Independent synchronization domains: Three independent low phase noise synchronization domains
  • Frequency domains: Four independent low phase noise frequency domains
  • Protocol support: Compatible with JESD204B/C standards
  • Time synchronization features: Equipped with a time-to-digital converter (TDC), time of day (TOD) counter, and precision time protocol (PTP) clocks
  • Clock outputs: 12 clock outputs with independent integer dividers
    • 8 outputs using LVDS, HCSL (AC-LVPECL), or CML
    • 4 outputs using LVDS, HCSL (AC-LVPECL), or LVCMOS
  • Output frequency range
    • CML: DC to 2.5GHz
    • LVDS or HCSL: DC to 1GHz
    • LVCMOS: DC to 250MHz
  • Input clock specifications
    • Clock inputs: Four differential or single-ended clock inputs
    • Voltage tolerance: Clock inputs tolerate 1.8V input when the device is powered off, sinking less than 1mA
    • Input frequency range: CLKIN input frequency from DC to 1GHz
  • Time sync TDC: Supports 1 pulse per second (1PPS) and pulse per two seconds (PP2S) inputs
  • Digital phase-locked loops (DPLLs)
    • Comply with ITU-T G.8262 and G.8262.1 standards
    • Input-to-output phase variation ≤ 100ps
  • Digitally controlled oscillator (DCO): Frequency resolution < 10^-13
  • Operating voltage: Functions on a 1.8V supply
  • Packaging: Compact 9mm x 9mm size in a 100-pin BGA

Applications

  • 5G radio units (RU)
  • 5G distribution units (DU), switches, and routers
  • Reference clock for 112Gbps and 224Gbps SerDes
  • High-performance DCO for precision time protocol (PTP) based clocks
  • Datacenter switch, accelerator card, AI interconnect

Documentation

Design & Development

Software & Tools
Renesas IC Toolbox (RICBox)
The Renesas IC Toolbox (RICBox) software platform enables customers to configure Renesas devices on evaluation kits when attached to the computer running the software.
Downloads
Renesas IC Toolbox (RICBox) Software Manual
 Software Package Renesas
1 item
RC38312A Evaluation Board

RC38312A-EVK

Evaluation
Learn More

FemtoClock 3 Wireless Ultra-Low Phase Noise Synchronizer and Jitter Attenuator Evaluation Kit

This RC38312A evaluation kit is used to evaluate the RC38312 FemtoClock™ 3 ultra-low phase noise radio synchronizer, multi-frequency clock synthesizer. The RC38312/

Featured Documents:
RC38312A Evaluation Board Manual

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Diagram of ECAD Models

Product Options

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    RC38312A100GBB#BC0
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    		 1 HCSL, LVCMOS, LVDS 8 CML, Crystal, HCSL, LVCMOS, LVDS, LVPECL 12 9.0 x 9.0 x 1.1 CABGA Tray Get Samples,
    RC38312A200GBB#BC0
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    		1 HCSL, LVCMOS, LVDS 8 CML, Crystal, HCSL, LVCMOS, LVDS, LVPECL 12 9.0 x 9.0 x 1.1 CABGA Tray Get Samples,
    RC38312A100GBB#HC0
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    		1 HCSL, LVCMOS, LVDS 8 CML, Crystal, HCSL, LVCMOS, LVDS, LVPECL 12 9.0 x 9.0 x 1.1 CABGA Reel Get Samples,
    RC38312A200GBB#HC0
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    		 1 HCSL, LVCMOS, LVDS 8 CML, Crystal, HCSL, LVCMOS, LVDS, LVPECL 12 9.0 x 9.0 x 1.1 CABGA Reel Get Samples,
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    Videos & Training

    FemtoClock 3 Wireless Overview

    FemtoClock™ 3 Wireless is an industry-leading, ultra-low phase noise synchronizer and jitter attenuator for 5G distribution units (DU), switches, and routers. RC38312 and RC38112 are designed for 5G and 5G-A BTS radio unit designs.

    Video List
    FemtoClock 3 Wireless Overview
    FemtoClock 3 Wireless Lab Demonstration

    News & Blog Posts

    Blog Post Oct 8, 2024