【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

2021-02-25 世强
双DSPLL消抖时钟发生器,SI5346,Silicon Labs 双DSPLL消抖时钟发生器,SI5346,Silicon Labs 双DSPLL消抖时钟发生器,SI5346,Silicon Labs 双DSPLL消抖时钟发生器,SI5346,Silicon Labs

SI5346SILICON 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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开发环境(软件/固件)  -  SILICON LABS RAR 英文 下载

Silicon Labs(芯科科技) Si5341/Si5342/Si5344/Si5345/Si5347版本变更通知(#1611291)

型号- SI5341A-D-GMR,SI5345A-B-GM,SI5340A-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,SI5347A-D-GMR,SI5348A-B-GMR,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,SI5341A-B-GM,SI5341B-B04187-GMR,SI5347D-B-GMR,SI5345D-B04501-GM,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,SI5345A-D-GM,SI5340C-D-GMR,SI5345B-B04421-GM,SI5348B-B05017-GM,SI5347C-D-GMR,SI5346B-B-GM,SI5342D-B-GM,SI5345C-B-GM,SI5344D,SI5345B-B05825-GM,SI5342B-D-GM,SI5342D-B04694-GM,SI5344D-D-GM,SI5344A-D-GM,SI5345A-B04957-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,SI5345A-A-GM,SI5345B-B05747-GM,SI5342B,SI5348B-B05856-GM,SI5342C,SI5342D,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,SI5348A,SI5345B-B05786-GM,SI5346A-B-GM

产品变更通知及停产信息  -  SILICON LABS  - 2016年11月29日 PDF 英文 下载

AN699: FPGA Reference Clock Phase Jitter Specifications

型号- SI545,SI56X,SI53X,SI5394,SI5383,SI5392,SI5391P,SI5342,SI5397,SI5332,SI5340,SI5395,SI5341,SI5396,SI5346,SI5335,SI5347,SI5344,SI5345,SI5389,SI540,SI5348,SI570,SI5338

应用笔记或设计指南  -  SILICON LABS  - Rev. 0.2  - 2020/08/07 PDF 英文 下载

Silicon Labs(芯科科技) Si5340-EVB 评估板使用说明

型号- SI5345A-B-GM,SI5340A-D-GMR,SI5327B-C-GM,SI5345D-B03700-GM,SI5346A-D-GMR,SI5345D-B04831-GM,SI5344D-B-GM,SI536X,SI5341C-B-GM,SI5345B-B05955-GM,SI5310-C-GM,SI5342D-D-GM,SI5341A-B-GM,SI5341A-B-GMR,SI5347C-B-GM,SI5341D-D-GMR,SI5340C-B-GMR,SI5345B-B00021-GM,SI5345B-B06003-GM,SI5325A-C-GM,SI5347B-D-GM,SI5345C-D-GM,SI5347D-D-GMR,SI5346B-B-GMR,SI5345D-B04493-GM,SI5345D-B05784-GM,SI5323-C-GM,SI5341B-D-GM,SI5340D-B-GMR,SI5345A-D-GM,SI5316-C-GM,SI5348B-B05017-GM,SI5347C-D-GMR,SI5327B,SI5315A,SI5342H-C04990-GMR,SI5324C-C-GM,SI5342B-D-GM,SI5326C-C-GM,SI5345A-B04957-GM,SI5344A-D-GM,SI5345D-B04830-GM,SI5344B-A-GMR,SI5328B-C-GM,SI5326B-C-GM,SI5326B-C-GMR,SI5340C-D-GM,SI5345B-B03234-GM,SI5328B,SI5328C,SI5326A-B-GM,SI5341B-B-GM,SI5321-H-BL,SI5345D-B04500-GM,SI5344B-B04184-GM,SI5341B-B05609-GMR,SI5341B-B-GMR,SI5345C-A-GM,SI5344D-B-GMR,SI5345B-B04881-GM,SI5340,SI5346B-D-GM,SI532X,SI5342A-B-GM,SI5345B-B05785-GM,SI5345D-B05731-GM,SI5325A,SI5340B-D-GMR,SI5345A-A-GM,SI5345B-B05747-GM,SI5342H-C04990-GM,SI5347B-B-GMR,SI5348B-B05083-GM,SI5345B-B04823-GM,SI5348B-B05423-GM,SI5326A,SI5326B,SI5326C,SI5346A-D-GM,SI5340A-B-GM,SI5326C-B-GM,SI5345D-B-GM,SI5346B-A-GMR,SI5369A-C-GQR,SI5341B-B04964-GMR,SI5340D-D-GM,SI5364,SI5365,SI5345B-D-GM,SI5326B-B-GM,SI5366,SI5326A-C-GM,SI5347C,SI5347D,SI534X,SI5341D-B-GMR,SI5347A,SI5347B,SI5345D-B04528-GM,SI5347A-B-GMR,SI5341D-D-GM,SI5348A-D-GM,SI5341C-B-GMR,SI5324C,SI5348A,SI5345B-B05786-GM,SI5341A-D-GMR,SI5347D-B-GM,SI5344C-B-GM,SI5341B-B04918-GMR,SI5347A-D-GM,SI5365-C-GQ,SI5345B-B04564-GM,SI5345D-D-GM,SI5348A-B-GMR,SI5347A-D-GMR,SI5346A-B-GMR,SI5342D-B05470-GM,SI5345A,SI5345B,SI5345C,SI5345D,SI5369A,SI5341B-B04187-GMR,SI5347D-B-GMR,SI5345D-B04501-GM,SI534XH,SI5322-C-GM,SI5356B-B00322-GMR,SI5341D-B-GM,SI5321-H-GL,SI5345D-B04409-GM,SI5344A-B-GM,SI5310,SI5342C-D-GM,SI5346B,SI5341B-B05197-GMR,SI5344B-D-GM,SI5316,SI5345B-B-GMR,SI5346A,SI5345D-B04502-GM,SI5347A-B-GM,SI5341B-B05496-GM,SI5320,SI5321,SI5340B-B-GM,SI5341C-D-GM,SI5322,SI5323,SI5367A,SI5340C-D-GMR,SI5345B-B04421-GM,SI5320-G-BC,SI5346B-B-GM,SI5342D-B-GM,SI5344H,SI5322-C-GMR,SI5345C-B-GM,SI5344D,SI5345B-B05825-GM,SI5342D-B04694-GM,SI5344D-D-GM,SI5347C-D-GM,SI5368A-C-GQ,SI5347A-A-GMR,SI5347B-D-GMR,SI5342D-B03814-GM,SI5345B-B03718-GM,SI5344A,SI531X,SI5344B,SI5344C,SI5347B-B-GM,SI5347C-B-GMR,SI5340D-D-GMR,SI5368A,SI5340A-D-GM,SI5341A,SI5341B,SI5341C,SI5341D,SI5340B-B-GMR,SI5341B-B04226-GMR,SI5340D-B-GM,SI5345B-B-GM,SI5340B-D-GM,SI5345A-B-GMR,SI5342H,SI5342B,SI5348B-B05856-GM,SI5342C,SI5342D,SI5342B-B-GM,SI5340-EVB,SI5346B-D-GMR,SI5345B-B05971-GM,SI5340C-B-GM,SI5342A,SI5364-H-BL,SI5366-C-GQ,SI5320-H-BL,SI5319B-C-GM,SI5348A-A-GM,SI5342C-A-GMR,SI5319B,SI5328C-C-GM,SI5342A-D-GM,SI5341C-D-GMR,SI5341B-A04048-GMR,SI5345A-B04313-GM,SI5345B-B04408-GM,SI5323-B-GM,SI5347D-D-GM,SI5340D,SI5345D-B04494-GM,SI5367A-C-GQ,SI5341A-D-GM,SI5340A,SI5340B,SI5340C,SI5345D-B04834-GM,SI5345B-B04563-GM,SI5341B-D-GMR,SI5345A-B04313-GMR,SI5340A-B-GMR,SI5345D-B05729-GM,SI5315A-C-GM,SI5345D-B04410-GM,SI5345A-A-GMR,SI5342H-D04990-GMR,SI5346A-B-GM

评估板使用说明  -  SILICON LABS  - Rev 1.0  - 2016年07月14日 PDF 英文 下载

ClockBuilder Pro Release Notes

型号- SI5382,SI5383,SI5380,SI5381,SI5386,SI5332-12IX-EVB,SI5384,SI5383-D-EVB,SI5341-EVB,SI5388,SI5346-D-EVB,SI5389,SI5332-8IX-EVB,SI5386A-E-EVB,SI53352,SI5382A-E-EVB,SI53354,SI5395P-A-EVB,SI51210,SI5394,SI5391,SI5392,SI5397,SI5382-EVB,SI5395,SI5391P-A-EVB,SI5396,SI5348-E-EVB,SI537X,SI5394A-A-EVB,SI5348-EVB,SI5395E-A-EVB,SI5341-D-EVB,SI5348-D-EVB,SI5332-6IX-EVB,SI5332-AM1-QFN32-EVB,SI5338-EVB,SI538X,SI5392E-A-EVB,SI5389-EVB,SI5346-EVB,SI5344H,SI5380-D-EVB,SI5340-D-EVB,SI5394P-A-EVB,SI5332-8EX-EVB,SI5332-AM2-QFN40-EVB,SI5357-EVB,SI5332,SI539X,SI5344-EVB,SI5335,SI5334,SI5372J-A-EVBS,SI5338,SI5347-D-EVB,SI5397A-A-EVB,SI51211-EVB,SI5380A-D-EVB,SI5342,SI5340,SI5341,SI5346,SI5347,SI5344,SI5345,SI5342-EVB,SI5348,SI5342H,SI51218-EVB,SI5342-D-EVB,SI5372A-A-EVB,SI5332-8A-EVB,SI5340-EVB,SI5350,SI5345-D-EVB,SI5351,SI5357,SI5355,SI5356,SI5332-6EX-EVB,SI5344H-EVB,SI5394E-A-EVB,SI5381-EVB,SI5356-EVB,SI5347-EVB,SI51214,SI51211X,SI51211,SI51218,SI53358,SI5332-12EX-EVB,SI534X,SI5345-EVB,SI535X-B20QFN-EVB,SI5371,SI5372,SI5344-D-EVB,SI5381A-E-EVB,SI535X,SI5391A-A-EVB,SI5332-6A-EVB,SI5395A-A-EVB

开发环境(软件/固件)  -  SILICON LABS  - Version 2.45  - 2020-07-16 PDF 英文 下载 查看更多版本

Si5347, Si5346 Revision D Reference Manual

型号- SI5346,SI5347,SI5347C,SI5346B,SI5347D,SI5347A,SI5346A,SI5347B

用户指南  -  SILICON LABS  - Rev. 1.3  - 2018/12/07 PDF 英文 下载 查看更多版本

【经验】高性能抖动衰减时钟倍频器Si5347、Si5346在DCO应用上的增益和输出频率的计算

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。

设计经验    发布时间 : 2018-12-10

【应用】高性能抖动衰减时钟倍频器助力数字控制振荡器设计

本文主要介绍了Silicon labs的抖动衰减时钟倍频器Si5346和Si5347差分输出频率范围:高达712.5MHz,可满足数字振荡器的高频输出要求,用于FIFO管理,频率裕度或可变本地振荡器等应用

应用方案    发布时间 : 2018-05-24

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