【经验】双DSPLL消抖时钟发生器SI5346的OOF参考源选择引起的失锁问题分析
SI5346是SILICON LABS公司经典的双DSPLL消抖时钟发生器产品,支持8kHz~750MHz之间任意频点输入,支持任意频点、任意电平格式的时钟0 ppm合成输出。目前使用SI5346的场合主要是对时钟要求较高的通信设备、仪器设备等,特别是通信设备中一般用于以太网或其他通信线路恢复时钟的消抖,需要综合考虑输入消抖时钟的不确定性,因此在使用时会打开各种告警指示寄存器对输入信号进行判决。
日前有工程师使用SI5346作为去抖时钟时碰到一个失锁现象,在使用自制的评估板进行评估,发现外部接入回复的CDR时钟和信号源时钟分别作为输入源时存在不同的失锁现象,尽管两者的输入时钟都是156.25MHz。
用户测试输入条件,根据其CBPro判断,输入IN0和IN1都为156.25MHz,输出OUT0/OUT1为312.5MHz,选择DSPLLA环作为参考。失锁现象使用IN0作为输入时,可以正常锁定,无LOL失锁告警,当收到选择IN1作为输入时(IN0未关闭),出现告警,用户认为区别在与IN0来自于网络恢复的时钟,IN1来自于较为稳定的信号发生器时钟。在进一步打开用户的工程文件时,分别对比了输入、输出、环路带宽、无损伤切换、holdover、LOS、LOL、OOF等设置,并读取了对应的状态指示寄存器,发现IN1输入时有OOF告警,OOF告警导致了LOL失锁。
打开OOF设置界面(如下图),发现存在下述问题就是OOF的参考时钟被修改成了IN0,一般情况下这里都设置成较为稳定的XA/XB参考时钟。
图1 OOF参考源配置
本案例中,OOF的参考时钟被选择成IN0,而IN0本身来自于恢复的时钟,没经过去抖、整形等处理时可能本身不稳定,这时如果以IN0作为输入,本身起不到真正的参考作用,但是锁相环是可以正常锁定的。但是切换到IN1作为输入源时,因为IN0的参考时钟相对于IN1信号源时钟来说本身不稳定,导致OOF判决生效,导致LOL失锁,实际上用户在关闭OOF检测了,就可以正常锁定了。解决问题的方法其实很简单,这里为OOF参考时钟挑选一个稳定的参考源,直接选择XA/XB作为OOF参考时钟即可,经过测试,修改后可以正常锁定。
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Silicon Labs推出的Si5347、Si5346是一款集成了DSPLL的高性能抖动衰减时钟倍频器,本文详解了有关于DCO数控振荡器的增益和输出频率的计算,在信号处理,数字通信领域,调制解调,变频调速,制导控制,电力电子等领域都有广泛地应用。
Silicon Labs(芯科科技) AN922 对于Si5346/ 47频率使用命令行界面(CLI) 应用笔记
描述- 本资料介绍了如何使用Si5346/47多PLL时钟器件的命令行接口(CLI)进行动态频率调整。内容包括使用ClockBuilder Pro软件生成注册写入以改变频率的步骤,以及如何通过批处理文件调用CLI工具来更改Si5346和Si5347设备的频率。资料还提供了工作流程示例,包括创建基础项目文件、频率编辑文件和批处理文件,以及如何使用这些文件来生成注册设置更改文件,从而在运行时更改输出频率。
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,SI5342H-C04990-GMR,SI5344H,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】如何利用时钟发生器free run模式规避通信系统输入频偏过大
Silicon Labs SI534X时钟发生器使用时往往运行于free run模式,可以规避这种系统上电输入不稳定(频偏过大)的现象。
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