【产品】单芯片网络同步时钟方案,优化系统功耗和体积
数据中心交换机及电信设备对于时钟系统解决方案的要求包括低抖动、小尺寸和低功耗,随著网络频宽和传输速度的激增,上述要求愈来愈难同时达成,为时钟产品供应商带来极艰钜的挑战。对此,SILICON LABS(亦称“芯科科技”)率先提出高集成度的单芯片网络同步时钟解决方案,包括Si5348、Si5383和Si5384系列产品,进而以单芯片设计改善目前行业大多数采用双PLL架构的复杂度,并同时减轻系统信号抖动、功耗和成本。
单芯片网络同步器时钟设计优势
目前行业基于双PLL的网络同步时钟解决方案架构,需要一个额外的二次侧抖动滤除器件(Secondary Jitter Cleaner),这使得整体系统变得复杂、空间需求加大且可能需较高成本。相较之下,Silicon Labs的Si5348、Si5383和Si5384网络同步时钟可以帮助工程师实现仅采用单芯片的架构,进一步降低系统抖动、成本和尺寸,如下图所示:
Silicon Labs的网络同步器时钟在抖动性能、功耗方面处于行业领先水平,凭借多达三种集成DSPLL和小封装尺寸,这类设备为计时同步领域降低了复杂程度并缩小PCB尺寸要求,非常适合SyncE/SONET/SDH 计时卡,以及无线通信系统和数据中心交换机。每个DSPLL都能单独配置为一个 SyncE/SONET/SDH PLL,IEEE 1588 DCO,支持1PPS/1Hz;或一个通用PLL,支持处理器或FPGA时钟。旧版SETS系统也能使用这些设备达到Stratum 3/3E标准。 提供创新PCI Express和LVCMOS时钟,这些时钟简化设计并降低成本敏感的应用的功耗。
图:基于Si5348/83/84网络同步时钟的系统设计框图
Si5348/83/84网络同步时钟特点:
• 多达三种独立的DSPLL支持灵活的SyncE/SONET/SDH、IEEE 1588和SETS架构
• 每种DSPLL利用任意输入频率生成任意输出频率
• 支持1PPS/1Hz输入和输出频率
• 出色的100fs RMS抖动性能
• 每种DSPLL的可编程环路带宽低至0.001Hz
• 同步、自由运行和保持模式
• 自动/手动无中断切换
• 状态监控:LOL、LOS、OOF
• 每种DSPLL上引脚或软件可控制DCO具有的分辨率达1 ppt/步
• 满足以下标准要求:
--ITU-T G.8262 (SyncE) EEC选项1和2
--ITU-T G.812 类型 III、IV
--ITU-T G.813 选项 1
--Telcordia GR-1244、GR-253 (Stratum 3/3E)
• 适合ITU-T G.8273.2应用
相关技术文档:
Silicon Labs Si5348片上时钟树系列时钟发生器数据手册 详情>>>
Silicon Labs AN914 si5348在边界时钟的应用 应用笔记 详情>>>
Silicon Labs Si5383/84 网络同步器时钟参考手册 详情>>>
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新应用 发布时间 : 2019-07-11
Silicon Labs(芯科科技) Si5341-EVB 评估板使用说明
型号- SI5341B-B-GM,SI5341A-D-GMR,SI5341A,SI5341B,SI5341-EVB,SI5341B-B04918-GMR,SI5341C,SI5341D,SI5341B-B05609-GMR,SI5341B-B05496-GM,SI5341B-B-GMR,SI5341B-B04226-GMR,SI5341B-D-GM,SI5341B-B04964-GMR,SI5341C-D-GM,SI5341,SI5341C-B-GM,SI5341-EVB,SI5341C-D-GMR,SI534X,SI5341B-A04048-GMR,SI5341D-B-GMR,SI5341B-B04187-GMR,SI5341A-B-GM,SI5341A-D-GM,SI5356B-B00322-GMR,SI5341D-B-GM,SI5341D-D-GM,SI5341B-D-GMR,SI5341A-B-GMR,SI5341D-D-GMR,SI5341C-B-GMR,SI5341B-B05197-GMR
Silicon Labs(芯科科技) AN947 使用si5340/41/42/44/45/80实现零延迟模式 应用笔记
型号- SI5345A-B-GM,SI5340A-D-GMR,SI5341A-D-GMR,SI5347D-B-GM,SI5344C-B-GM,SI5341B-B04918-GMR,SI5347A-D-GM,SI5345D-B03700-GM,SI5345B-B04564-GM,SI5345D-D-GM,SI5346A-D-GMR,SI5348A-B-GMR,SI5347A-D-GMR,SI5380,SI5345D-B04831-GM,SI5346A-B-GMR,SI5344D-B-GM,SI5342D-B05470-GM,SI5341C-B-GM,SI5345A,SI5345B,SI5345C,SI5345B-B05955-GM,SI5345D,SI5342D-D-GM,SI5341B-B04187-GMR,SI5341A-B-GM,SI5347D-B-GMR,SI5380-A-ZXM,SI5345D-B04501-GM,SI534XH,SI5356B-B00322-GMR,SI5341D-B-GM,SI5341A-B-GMR,SI5345D-B04409-GM,SI5347C-B-GM,SI5344A-B-GM,SI5341D-D-GMR,SI5340C-B-GMR,SI5342C-D-GM,SI5345B-B00021-GM,SI5345B-B06003-GM,SI5346B,SI5341B-B05197-GMR,SI5347B-D-GM,SI5344B-D-GM,SI5345C-D-GM,SI5347D-D-GMR,SI5345B-B-GMR,SI5346A,SI5346B-B-GMR,SI5345D-B04493-GM,SI5345D-B04502-GM,SI5347A-B-GM,SI5341B-B05496-GM,SI5345D-B05784-GM,SI5341B-D-GM,SI5340B-B-GM,SI5340D-B-GMR,SI5341C-D-GM,SI538X,SI5345A-D-GM,SI5340C-D-GMR,SI5345B-B04421-GM,SI5348B-B05017-GM,SI5347C-D-GMR,SI5346B-B-GM,SI5342D-B-GM,SI5380-D-EVB,SI5344H,SI5342H-C04990-GMR,SI5345C-B-GM,SI5344D,SI5345B-B05825-GM,SI5342B-D-GM,SI5342D-B04694-GM,SI5344D-D-GM,SI5345A-B04957-GM,SI5344A-D-GM,SI5347C-D-GM,SI5345D-B04830-GM,SI5347A-A-GMR,SI5344B-A-GMR,SI5347B-D-GMR,SI5342D-B03814-GM,SI5345B-B03718-GM,SI5344A,SI5344B,SI5340C-D-GM,SI5345B-B03234-GM,SI5344C,SI5347B-B-GM,SI5347C-B-GMR,SI5340D-D-GMR,SI5341B-B-GM,SI5340A-D-GM,SI5341A,SI5341B,SI5341C,SI5341D,SI5345D-B04500-GM,SI5344B-B04184-GM,SI5341B-B05609-GMR,SI5340B-B-GMR,SI5341B-B-GMR,SI5341B-B04226-GMR,SI5345C-A-GM,SI5340D-B-GM,SI5345B-B-GM,SI5344D-B-GMR,SI5345B-B04881-GM,SI5346B-D-GM,SI5340B-D-GM,SI5345A-B-GMR,SI5342A-B-GM,SI5345B-B05785-GM,SI5345D-B05731-GM,SI5340B-D-GMR,SI5342H,SI5345A-A-GM,SI5345B-B05747-GM,SI5342B,SI5348B-B05856-GM,SI5342C,SI5342D,SI5342H-C04990-GM,SI5342B-B-GM,SI5347B-B-GMR,SI5348B-B05083-GM,SI5346B-D-GMR,SI5345B-B04823-GM,SI5345B-B05971-GM,SI5340C-B-GM,SI5348B-B05423-GM,SI5342A,SI5346A-D-GM,SI5340A-B-GM,SI5345D-B-GM,SI5346B-A-GMR,SI5348A-A-GM,SI5341B-B04964-GMR,SI5340D-D-GM,SI5342C-A-GMR,SI5345B-D-GM,SI5342A-D-GM,SI5347C,SI5341C-D-GMR,SI5347D,SI534X,SI5341B-A04048-GMR,SI5345A-B04313-GM,SI5341D-B-GMR,SI5345B-B04408-GM,SI5347D-D-GM,SI5347A,SI5347B,SI5340D,SI5345D-B04494-GM,SI5345D-B04528-GM,SI5341A-D-GM,SI5347A-B-GMR,SI5340A,SI5340B,SI5340C,SI5341D-D-GM,SI5348A-D-GM,SI5345D-B04834-GM,SI5345B-B04563-GM,SI5341B-D-GMR,SI5345A-B04313-GMR,SI5340A-B-GMR,SI5345D-B05729-GM,SI5345D-B04410-GM,SI5341C-B-GMR,SI5345A-A-GMR,SI5342H-D04990-GMR,SI5348A,SI5345B-B05786-GM,SI5346A-B-GM
【经验】论开启OFF检测功能对SI5347高性能抖动衰减器的重要性
工程师使用SI5347时,首先要开启OOF检测功能,否则将导致锁相环长期处于校准状态,无法正常锁定。
设计经验 发布时间 : 2019-07-11
时钟发生器Si5347,使用锁相环B手动切主备时钟,在主时钟工作时能正常锁定,将主时钟信号拆下接入备用时钟输入端,软件也将信号切换到备用时钟,Si5347全部失锁怎么办?
检查主备时钟的切换程序,特别注意时钟发生器Si5347的锁相环B,其输入配置使用的是相应寄存器的位域[3:1],而另外3个锁相环A,C和D的输入配置使用的是相应寄存器的位域[2:0]。
技术问答 发布时间 : 2016-10-25
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