https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forumzh-CNTelligent Community 13Thu, 24 Sep 2026 16:40:33 GMThttps://e2echina.ti.com/thread/1094401?ContentTypeID=0Mon, 14 Sep 2026 08:26:06 GMT91561404-af28-475a-b96b-cb6cbaadd097:532bb70a-8191-45b1-8133-983bd2b86f08Chou Howard9https://e2echina.ti.com/thread/1094401?ContentTypeID=0https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1094401/lmkdb1108-lmkdb1108/rss?ContentTypeId=0<p><b>Part Number:</b> LMKDB1108</p><p>我司是震盪器廠家 目前伺服器廠家 指定 通過 LMKDB1108 進行測試 Phase Noise&nbsp;</p> <p>我司以購買 此EVM版&nbsp; 在使用時 採用 156.25 HCSL震盪器 做為板子的輸入端&nbsp; 軟件採用</p> <p>TICS PRO V1.7.10&nbsp; &nbsp;; 目前發現裝完軟件 板子 依舊無法正常工作&nbsp; &nbsp;</p> <p>能幫忙確認會是那些問題?</p>https://e2echina.ti.com/thread/3943262?ContentTypeID=1Thu, 24 Sep 2026 16:40:33 GMT91561404-af28-475a-b96b-cb6cbaadd097:cd8430ea-d602-482c-bf9a-80f4eff2e590Michael Srinivasan0https://e2echina.ti.com/thread/3943262?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1094401/lmkdb1108-lmkdb1108/rss?ContentTypeId=0<div lang="zh-x-mtfrom-en"> <p>谢谢分享。我立刻就能看出几个问题：</p> <p>您使用单端输入驱动 LMKDB1108 的输入端，尽管 HCSL 是一种差分驱动格式。这样做虽然可行，但您必须将未使用的输入端调整到输入摆幅的中点，而我没有看到您进行这样的修改。</p> <p>- 您只将其中一个输出支路送入 PNA，这意味着由于摆幅减小和信号完整性降低，您的相位噪声会更差。</p> <p>请尝试将一根 SMA 电缆连接到 HCSL 振荡器的另一个输出端，并将该输出端连接到 LMKDB1108EVM 的另一个输入端。此外，请将另一根 SMA 电缆连接到 OUT_P 信号端，以便将 OUT_P 和 OUT_N 信号发送到巴伦，然后将这两个信号合并成一个单端信号，该单端信号可以驱动 PNA 的输入端。</p> <p>谢谢，</p> <p>迈克尔</p> <div style="clear:both;"></div> </div><div style="clear:both;"></div>https://e2echina.ti.com/thread/3943260?ContentTypeID=1Thu, 24 Sep 2026 14:36:06 GMT91561404-af28-475a-b96b-cb6cbaadd097:cec96a7b-0b6e-46f7-88fb-1d9216956e50wu wu0https://e2echina.ti.com/thread/3943260?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1095551/lmx2572lp-lmx2572lp/rss?ContentTypeId=0<p>what about&nbsp;LMX2594</p><div style="clear:both;"></div>https://e2echina.ti.com/thread/1095551?ContentTypeID=0Wed, 23 Sep 2026 02:22:33 GMT91561404-af28-475a-b96b-cb6cbaadd097:97f4e2e0-5ce9-43df-adbf-6f30c10dbddcwu wu3https://e2echina.ti.com/thread/1095551?ContentTypeID=0https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1095551/lmx2572lp-lmx2572lp/rss?ContentTypeId=0<p><b>Part Number:</b> LMX2572LP</p><p>7.3.11 Phase Synchronization , figure 23, what about the fout within t1 time? fout is low level or high level or clock with uncertain phase?</p>https://e2echina.ti.com/thread/3943242?ContentTypeID=1Thu, 24 Sep 2026 04:58:06 GMT91561404-af28-475a-b96b-cb6cbaadd097:f9557264-6e7f-4666-a775-1f5812229a63Vivian Gao1https://e2echina.ti.com/thread/3943242?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1095551/lmx2572lp-lmx2572lp/rss?ContentTypeId=0<p><span>uncertain phase</span></p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3943234?ContentTypeID=1Thu, 24 Sep 2026 01:45:22 GMT91561404-af28-475a-b96b-cb6cbaadd097:f4dba0da-a9ab-4660-9d91-9c4aa62d000aMichael Srinivasan1https://e2echina.ti.com/thread/3943234?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1094401/lmkdb1108-lmkdb1108/rss?ContentTypeId=0<div lang="zh-x-mtfrom-en"> <p>能否事先发一张你设备设置的照片？我很想看看你是如何输入信号的。</p> <p>谢谢，</p> <p>迈克尔</p> <div style="clear:both;"></div> </div><div style="clear:both;"></div>https://e2echina.ti.com/thread/3943187?ContentTypeID=1Wed, 23 Sep 2026 03:47:42 GMT91561404-af28-475a-b96b-cb6cbaadd097:c58c5566-8141-412a-b67f-5696062f56aeVivian Gao1https://e2echina.ti.com/thread/3943187?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1095551/lmx2572lp-lmx2572lp/rss?ContentTypeId=0<p>Thank you for your attention to TI products. We are verifying your issue, please wait for our reply.</p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3943171?ContentTypeID=1Wed, 23 Sep 2026 02:05:48 GMT91561404-af28-475a-b96b-cb6cbaadd097:d4b3f3e0-9cba-448c-bd33-41f345459607Michael Srinivasan1https://e2echina.ti.com/thread/3943171?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1094401/lmkdb1108-lmkdb1108/rss?ContentTypeId=0<div lang="zh-x-mtfrom-en"> <p>振荡器输出看起来有点异常，你是如何测量的？另外，当你把它输入到LMKdB1108EVM时，LOS# LED指示灯亮了吗？</p> <p>谢谢，</p> <p>迈克尔</p> <div style="clear:both;"></div> </div><div style="clear:both;"></div>https://e2echina.ti.com/thread/3943144?ContentTypeID=1Tue, 22 Sep 2026 23:32:51 GMT91561404-af28-475a-b96b-cb6cbaadd097:ce959ec8-febc-4470-89a3-dbdd0e8f3751Eirwen0https://e2echina.ti.com/thread/3943144?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1093659/lmk00334-lmk00334rtvt-buf-clkout-3-3v/rss?ContentTypeId=0<p>下面是评估板的用户手册，您可以参考上面的回路图BOM以及LAYOUT进行检查：</p> <p><a href="https://www.ti.com.cn/lit/ug/snau155/snau155.pdf">www.ti.com.cn/.../snau155.pdf</a></p><div style="clear:both;"></div>https://e2echina.ti.com/thread/1093659?ContentTypeID=0Wed, 09 Sep 2026 11:31:12 GMT91561404-af28-475a-b96b-cb6cbaadd097:e9640e8b-ae24-4fe2-9241-49942b5c94ecYanlin Shi3https://e2echina.ti.com/thread/1093659?ContentTypeID=0https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1093659/lmk00334-lmk00334rtvt-buf-clkout-3-3v/rss?ContentTypeId=0<p><b>Part Number:</b> LMK00334</p><p><img src="https://e2echina.ti.com/cfs-file/__key/communityserver-discussions-components-files/124/8055.image.png" alt="image.png" data-temp-id="image.png-66947" /></p> <p>&nbsp;</p> <p>初步晶振输出到U30的 PIN 14 和 PIN 15 ，示波器单端测，Vmin = 1.024V ,Vmax = 1.403V ,Vpp= 379mV 的 100MHz 波形，电源VDD_CLK_3.3V 实际测量为3.3V ，目前 4 CH&nbsp; CLKOUT 无输出 电压 管脚电压一直保持在3.3V ，</p> <p>麻烦帮忙分析原理图是否存在问题，谢谢 .</p>https://e2echina.ti.com/thread/3943116?ContentTypeID=1Tue, 22 Sep 2026 05:36:38 GMT91561404-af28-475a-b96b-cb6cbaadd097:153189e9-bfea-4c4f-aa05-5dbec83164d5Michael Srinivasan1https://e2echina.ti.com/thread/3943116?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1094401/lmkdb1108-lmkdb1108/rss?ContentTypeId=0<div lang="zh-x-mtfrom-en"> <p>这是振荡器的输出吗？还是EVM的输出？我不认为问题出在电路板上。</p> <p>谢谢，</p> <p>迈克尔</p> <div style="clear:both;"></div> </div><div style="clear:both;"></div>https://e2echina.ti.com/thread/3942859?ContentTypeID=1Fri, 18 Sep 2026 22:25:16 GMT91561404-af28-475a-b96b-cb6cbaadd097:31b1efe5-dfa9-4e8a-a4b5-47e62c800859Michael Srinivasan1https://e2echina.ti.com/thread/3942859?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1094401/lmkdb1108-lmkdb1108/rss?ContentTypeId=0<div lang="zh-x-mtfrom-en"> <p>你好，</p> <p>感谢分享。您能用示波器测量一下HCSL的输入信号吗？（不使用LMKDB1108EVM）</p> <p>谢谢，</p> <p>迈克尔</p> <div style="clear:both;"></div> </div><div style="clear:both;"></div>https://e2echina.ti.com/thread/3942351?ContentTypeID=1Fri, 18 Sep 2026 00:36:59 GMT91561404-af28-475a-b96b-cb6cbaadd097:201cb4c4-2bdd-41e3-8bb1-d44b16931785Chou Howard1https://e2echina.ti.com/thread/3942351?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1094401/lmkdb1108-lmkdb1108/rss?ContentTypeId=0<div> <p><span>HCSL振荡器在送入LMKDB1108EVM之前，其每个输出端是否都具有50欧姆接地端？&nbsp;</span></p> <p><span style="color:#ff0000;">有的</span></p> <p><span>- 你是否通过寄存器或引脚设置将 CLKPWRGD_PD# 设置为高电平？<span style="color:#ff0000;">有的</span></span></p> <p><span>能否分享一下你的 TICS Pro 配</span></p> <p><span><span style="color:#ff0000;">參閱附件</span></span></p> <p><span>&nbsp;</span></p> <p><span><span style="color:#ff0000;">另外請教一下 不用在外交 訊號源 100Mhz ?</span></span></p> </div> <div></div><div style="clear:both;"></div>https://e2echina.ti.com/thread/3942345?ContentTypeID=1Fri, 18 Sep 2026 00:35:27 GMT91561404-af28-475a-b96b-cb6cbaadd097:b654af7f-31b7-4be8-9c4e-d130bff72b7fChou Howard0https://e2echina.ti.com/thread/3942345?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1094401/lmkdb1108-lmkdb1108/rss?ContentTypeId=0<div> <p><span>HCSL振荡器在送入LMKDB1108EVM之前，其每个输出端是否都具有50欧姆接地端？&nbsp;</span></p> <p><span style="color:#ff0000;">有的</span></p> <p><span>- 你是否通过寄存器或引脚设置将 CLKPWRGD_PD# 设置为高电平？<span style="color:#ff0000;">有的</span></span></p> <p><span>能否分享一下你的 TICS Pro 配</span></p> <p><span><span style="color:#ff0000;">參閱附件</span></span></p> <p>另外請教一下 不用在外交 訊號源 100Mhz ?</p> </div> <div></div><div style="clear:both;"></div>https://e2echina.ti.com/thread/1092488?ContentTypeID=0Fri, 04 Sep 2026 09:18:05 GMT91561404-af28-475a-b96b-cb6cbaadd097:b50ef141-82f9-46df-a9fc-8df46d94fd56HJK7https://e2echina.ti.com/thread/1092488?ContentTypeID=0https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1092488/lmk04832-lmk04832-lmk04828/rss?ContentTypeId=0<p><b>Part Number:</b> LMK04832</p><ol style="list-style-type:decimal;"> <li>LMK04832上电直接读芯片ID寄存器没反应，而换成LMK04828有反应且正确</li> <li>重新更换新的LMK04832也是没反应</li> <li>独看LMK04828的供电电流3.3V/0.38A，但是LMK04832的电流很低3.3V/0.057A测试过每个电源引脚电压都是有的，而且焊接没问题</li> <li>为什么LMK04832和04828在同样的板上/设计上表现会有区别？目前用的都是3线SPI，LMK04832/LMK04828都是使用三线，两张板子都是这样，LMK04832工作不起来，芯片电流也比较低3.3V/0.057A，而更换成LMK04828工作正常 电流3.3V/0.38A，我们也没配置POWER-DOWN之类的，反正LMK04832在我们板上就是工作不正常，我们怀疑不清楚是什么导致LMK04832的电流很小，从而SPI也不工作 。 有没什么可能影响或者排查的方向，我们检查过焊接，也尝试过新采购片子LMK04832 还是没效果</li> <li><img style="height:auto;" src="https://e2echina.ti.com/cfs-file/__key/communityserver-discussions-components-files/124/_FE564772_.png" alt=" " /></li> </ol>https://e2echina.ti.com/thread/3940547?ContentTypeID=1Wed, 16 Sep 2026 10:53:39 GMT91561404-af28-475a-b96b-cb6cbaadd097:6a41d989-be05-4e23-aeef-a5667dd357d1HJK0https://e2echina.ti.com/thread/3940547?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1092488/lmk04832-lmk04832-lmk04828/rss?ContentTypeId=0<p>您好，目前找到问题了，就是TXB0108的问题，有个问题咨询下，就是LMK04828 SDO默认工作在开漏模式，然后我们配置FPGA引脚内部上拉可以读写，但是<span>LMK04832 SDO默认工作在开漏模式，然后我们配置FPGA引脚内部上拉却不能读写是什么原因呢，先写入配置成推挽模式，然后也还是读不到，而换成TXS0108可以，这是为什么</span></p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3940450?ContentTypeID=1Tue, 15 Sep 2026 23:35:10 GMT91561404-af28-475a-b96b-cb6cbaadd097:f9371f79-dd04-452f-937e-a83d30aedcc5Michael Srinivasan1https://e2echina.ti.com/thread/3940450?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1094401/lmkdb1108-lmkdb1108/rss?ContentTypeId=0<div lang="zh-x-mtfrom-en"> <p>你好，</p> <p>首先提出几个问题：</p> <p>- HCSL振荡器在送入LMKDB1108EVM之前，其每个输出端是否都具有50欧姆接地端？</p> <p>- 你是否通过寄存器或引脚设置将 CLKPWRGD_PD# 设置为高电平？能否分享一下你的 TICS Pro 配置？</p> <p>谢谢，</p> <p>迈克尔</p> <div style="clear:both;"></div> </div><div style="clear:both;"></div>https://e2echina.ti.com/thread/3939664?ContentTypeID=1Tue, 15 Sep 2026 03:00:56 GMT91561404-af28-475a-b96b-cb6cbaadd097:b04c3463-b386-420b-9436-ad776646dc9aDerek Payne0https://e2echina.ti.com/thread/3939664?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1094363/lmk04832-lmk04832/rss?ContentTypeId=0<div lang="zh-x-mtfrom-en"> <p>我认为您是对的，PLL 可能锁定在了某个杂散信号上，该信号可能是通过 PLL2_RCLK_MUX 中的寄生元件耦合，也可能是通过电源引脚耦合。根据振荡器输出断开的方式，输出也可能仍然通过电容耦合到附近的走线。</p> <p>PLL2 无法自动切换，CLKINx 和 OSCIN 之间也无法自动切换。您可以尝试使用 LOS 检测和手动参考切换。除非 PLL1 可以锁定，否则我认为无法实现自动参考切换。您也可以将 PLL1 与 100MHz VCXO 配合使用，PLL1 的保持功能可以维持 VCXO 上次锁定时的 PPM 精度。</p> <div style="clear:both;"></div> </div><div style="clear:both;"></div>https://e2echina.ti.com/thread/1094363?ContentTypeID=0Sun, 13 Sep 2026 11:08:54 GMT91561404-af28-475a-b96b-cb6cbaadd097:ef34a07a-0afc-4920-a1ee-98e8d1c1cdfeJia Tan2https://e2echina.ti.com/thread/1094363?ContentTypeID=0https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1094363/lmk04832-lmk04832/rss?ContentTypeId=0<p><b>Part Number:</b> LMK04832</p><p>LMK04832的CLKin1接单端100M的外部时钟源，经过内部倍频输出400M的时钟。此外OSCin也接了一个100M_LVDS晶振，用于备用。LMK04832的配置如下图所示，启用的是CLKin1通道。</p> <p>测试时发现，当CLKin1的外部时钟源漏接时，400M输出链路上可检测到一个403M的时钟，且幅度正常。怀疑是100M晶振的时钟信号耦合到了CLKin1通道上，将100M晶振的输出通道断掉，测得04832输出了一个396M的时钟。进一步将晶振的电源断掉，测得04832输出了一个376M的时钟。</p> <p>目前问题还未解决，请协助分析。</p> <p><img src="https://e2echina.ti.com/cfs-file/__key/communityserver-discussions-components-files/124/5417.image.png" alt="image.png" data-temp-id="image.png-154947" /></p> <p><img src="https://e2echina.ti.com/cfs-file/__key/communityserver-discussions-components-files/124/44004.image.png" alt="image.png" data-temp-id="image.png-244843" /></p>https://e2echina.ti.com/thread/3939116?ContentTypeID=1Mon, 14 Sep 2026 09:26:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:e0d1ad71-e9df-456e-90a8-fa7b8d351caeDaniel0https://e2echina.ti.com/thread/3939116?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1094401/lmkdb1108-lmkdb1108/rss?ContentTypeId=0<p>您好</p> <p>已经收到了您的案例，调查需要些时间，感谢您的耐心等待</p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3939049?ContentTypeID=1Sun, 13 Sep 2026 22:48:58 GMT91561404-af28-475a-b96b-cb6cbaadd097:2154724f-f7ce-4221-96ad-3b0cfd83f5e9Eirwen0https://e2echina.ti.com/thread/3939049?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1094363/lmk04832-lmk04832/rss?ContentTypeId=0<p>已经收到了您的案例，调查需要些时间，感谢您的耐心等待。</p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3937061?ContentTypeID=1Thu, 10 Sep 2026 10:25:21 GMT91561404-af28-475a-b96b-cb6cbaadd097:934d9619-8ac5-437a-a957-3b9f33c49468HJK0https://e2echina.ti.com/thread/3937061?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1092488/lmk04832-lmk04832-lmk04828/rss?ContentTypeId=0<p><img style="max-height:240px;max-width:320px;" src="https://e2echina.ti.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/124/pastedimage1789035769611v1.png" alt=" " />另外问一下LMK04828手册为什么表格表头写 ADDRESS [11:0]一共12位，而时序中以及0X1FFF等地址是13位，是手册表格表头这里描述有错误吗还是什么原因</p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3937060?ContentTypeID=1Thu, 10 Sep 2026 10:00:12 GMT91561404-af28-475a-b96b-cb6cbaadd097:4c186f6c-1308-40f9-b901-6031a1d215ebHJK0https://e2echina.ti.com/thread/3937060?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1092488/lmk04832-lmk04832-lmk04828/rss?ContentTypeId=0<p>1. LMK04832 默认禁用所有输出和PLL的话一般功耗电流会有多大，按道理应该也不止0.06A把，而且我们也没打到OSCOUT有输出</p> <p>2. 关于TXB0108这个器件我们之前也发现了有问题，我们测试过转换后的CS/CLK/SDI引脚波形，发现CS由于4.7k上拉没法有效拉低，CLK和SDI波形没问题，后面我们试过把电阻加大成51k，虽然CS能拉低，但是LMK04832依然没反应，也试过更换成TXS0108，结果依然没改善</p> <p>3. 目前主要是同样的硬件，只改变时钟芯片，LMK0428可以工作，LMK04832编程读写都没反应，专家是否有什么建议，还是说再换芯片试试，我们之前也多次换过LMK04832。<img style="max-height:240px;max-width:320px;" src="https://e2echina.ti.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/124/pastedimage1789034398196v1.png" alt=" " /></p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3937019?ContentTypeID=1Thu, 10 Sep 2026 02:14:11 GMT91561404-af28-475a-b96b-cb6cbaadd097:4d44f91d-336e-4f1b-a95b-50b6d968d68cYanlin Shi1https://e2echina.ti.com/thread/3937019?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1093659/lmk00334-lmk00334rtvt-buf-clkout-3-3v/rss?ContentTypeId=0<p>更新：<span>&nbsp;PIN 14 和 PIN 15 两个通道Math相减&nbsp; Vpp = 800mV&nbsp;&nbsp;</span></p><div style="clear:both;"></div>https://e2echina.ti.com/thread/3937000?ContentTypeID=1Wed, 09 Sep 2026 22:57:24 GMT91561404-af28-475a-b96b-cb6cbaadd097:1d5bcd87-fe52-4436-9876-19f519178bfcEirwen0https://e2echina.ti.com/thread/3937000?ContentTypeID=1https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1093659/lmk00334-lmk00334rtvt-buf-clkout-3-3v/rss?ContentTypeId=0<p>已经收到了您的案例，调查需要些时间，感谢您的耐心等待。</p><div style="clear:both;"></div>