https://e2echina.ti.com/support/clock-and-timing/zh-CNTelligent Community 13https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1091087/lmk04828-lmk04828-multi-board-clock-synchronization/3927148Mon, 24 Aug 2026 05:14:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:71d0d931-05bb-4728-804d-cf66294ea731LinksHello, We have received your case and are currently investigating it. The review process may take some time, and we sincerely appreciate your patience in the meantime.https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1091085/lmk04828-ep-lmk04828-multi-board-clock-synchronization/3927110Sun, 23 Aug 2026 23:17:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:4ed63919-1f9f-4548-9988-0d57544f266eFRANK1Thank you for contacting TI China E2E forum and choosing our products as part of your solution. Regarding your query, please give us some time to confirm this issue.https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1091087/lmk04828-lmk04828-multi-board-clock-synchronizationSat, 22 Aug 2026 01:55:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:bfc8fed4-9643-426f-aeeb-bb526388d9cexue xiaomanPart Number: LMK04828 Hi I am working on a custom hardware utilizing the LMK04828. My goal is to achieve Multi-clock Sync across multiple boards. The hardware clocking architecture is centered around the LMK04828 jitter cleaner/clock distributor. The current configuration is as follows: the first clock board: A 100MHz clock is provided to the OSCin pin of the LMK04828 to achive the 250MHz clock and 7.8125MHz sysref to the second clock board. the second clock board: the 250MHz clock is provided to the CLKin1 pin of the LMK04828 ， while 7.8125MHz sysref is provided to the CLKin0 pin of the LMK04828, this LMK04828 is used as clock distributor to produce more DCLKOUTs (250MHz) and SDCLKOUTs (7.8125MHz) 。 question ： we only provided 250MHz clock to the CLKin1 pin of the second clock board LMK04828 ,the DCLKOUTs are 250MH z, while SDCLKOUTs are spurs. But when we provided 250MHz clock to the CLKin1 and 7.8125MHz sysref to the CLKin0 pin of the LMK04828 ， the SDCLKOUTs work well 。 We don't know why SDCLKOUTs are spurs when we only provided 250MHz clock to the CLKin1 pin 。 Can you give me some advice?数据通信模块lmk04828https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1091085/lmk04828-ep-lmk04828-multi-board-clock-synchronizationSat, 22 Aug 2026 01:44:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:bda0234e-09bb-40d7-891f-becce451f81cxue xiaomanPart Number: LMK04828-EP Other Parts Discussed in Thread: LMK04828 Hi ,sir I am working on a custom hardware utilizing the LMK04828 . My goal is to achieve Multi-clock Sync across multiple boards. The hardware clocking architecture is centered around the LMK04828 jitter cleaner/clock distributor. The current configuration is as follows: the first clock board: A 100MHz clock is provided to the OSCin pin of the LMK04828 to achive the 250MHz clock and 7.8125MHz sysref to the second clock board. the second clock board: the 250MHz clock is provided to the CLKin1 pin of the LMK04828，while 7.8125MHz sysref is provided to the CLKin0 pin of the LMK04828, this LMK04828 is used as clock distributor to produce more DCLKOUTs (250MHz) and SDCLKOUTs (7.8125MHz)。 question： we only provided 250MHz clock to the CLKin1 pin of the second clock board LMK04828 ,the DCLKOUTs are 250MHz, while SDCLKOUTs are spurs. But when we provided 250MHz clock to the CLKin1 and 7.8125MHz sysref to the CLKin0 pin of the LMK04828， the SDCLKOUTs work well。 We don't know why SDCLKOUTs are spurs when we only provided 250MHz clock to the CLKin1 pin。Can you give me some advice?LMK04828-EP数据通信模块lmk04828https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1087488/lmx1205-lmx1205/3918897Mon, 10 Aug 2026 02:01:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:11fe43ea-8158-4feb-92df-989ece8e778dLinks您好， DEV_IOPT_CTRL (R55[5:0]) 字段必须在所有模式下（包括上电后）设置为 0x6，请尝试设置为0x370006，看下结果。https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086779/cdclvc1310-cdclvc1310/3914178Tue, 04 Aug 2026 04:30:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:19c94251-5fdf-4dd0-9555-578bb5cb7416FRANK1我手头没有硬件测量条件，如果更换晶振后还是不行的吧，建议你按照我之前的建议，看看我们评估板的设计资料，比较排查下。电路和PCB布局并不复杂。https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1087488/lmx1205-lmx1205/3914176Tue, 04 Aug 2026 03:59:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:6a130f6f-1a1b-4479-800c-9b9e9034cbefAlice您好， 已经收到了您的案例，调查需要些时间，感谢您的耐心等待。https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1087488/lmx1205-lmx1205Tue, 04 Aug 2026 02:23:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:5bb71510-1e96-444c-b1cf-76b8c4f7035a?? ?Part Number: LMX1205 你好，我在使用LMX1205芯片时遇到一些问题，我们没有使用评估板，使用的单独的芯片，通过SPI来控制,我按以下步骤初始化芯片，没有输出我需要的频率，但寄存器回读是我写进去的值。是否有什么特殊的寄存器需要配置？或者特殊的写入顺序？ 以下是我的配置步骤： 1：上电后软件复位： LMX1205_Write_Registers(0x00,0x0001); Delay_us(5000); LMX1205_Write_Registers(0x00,0x0000); Delay_us(5000); 2：降序写入寄存器表，该表由TICS_PRO软件生成： 0x4D0000, 0x370000, 0x360000, 0x2D2ABF, 0x2C7707, 0x2B7707, 0x2A76F3, 0x2978F3, 0x2878E1, 0x2778E1, 0x250000, 0x248947, 0x200000, 0x1F0000, 0x1E0000, 0x1D0000, 0x1B661A, 0x1A00D0, 0x1901FF, 0x1801FF, 0x1701FF, 0x1601FF, 0x1501FF, 0x14C051, 0x130004, 0x120000, 0x110004, 0x100030, 0x0F0001, 0x0E00C9, 0x0D002B, 0x0C002B, 0x0B5CA9, 0x0A5CA9, 0x095CA9, 0x085CA9, 0x07000D, 0x06000D, 0x05000D, 0x04000D, 0x030000, 0x0201FF, 0x01001B, 0x000000 3：写入寄存器（ DEV_IOPT_CTRL字段）：0x370006 以下是我的软件配置：测试和测量LMX1205https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1087045/cdclvd1216-cdclvd1216/3914027Mon, 03 Aug 2026 02:51:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:47d5b4f5-e47a-4250-b75f-ac882937731fuser1359349非常感谢您的回复https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086779/cdclvc1310-cdclvc1310/3913532Fri, 31 Jul 2026 08:03:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:16a859dd-12eb-473e-b386-129a57c82255user139110820M晶振上电后测量XIN和Y0波形如下，第一通道XIN，第二通道Y0 用示波器探头点住XIN对地电容的XIN端，输出能测量到20M时钟，波形如下： 示波器规格如下https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086779/cdclvc1310-cdclvc1310/3913528Fri, 31 Jul 2026 07:52:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:3c5073d8-37cf-45af-a4f5-76684953ce7aFRANK1手里没硬件调试， datasheet范围是8~50MHz。https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086779/cdclvc1310-cdclvc1310/3913527Fri, 31 Jul 2026 07:49:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:d157170b-7a3f-4b42-8c75-5776d6e987eaFRANK1手里没硬件调试， datasheet范围是https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1087270/lmk04832-lmk04832-spi/3913471Fri, 31 Jul 2026 02:06:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:fb82bed1-fbeb-42ab-9ca5-465d45dde1bbAlice您好， 电平转换芯片支持三线SPI的SDIO的双向通讯吗？ 链接帖子也同样使用了 NLSX5014，是贵司的案例吗？请参考此贴内的回复 LMK04832: LMK04832 SPI interface cannot read back data - Clock & timing forum - Clock & timing - TI E2E support forumshttps://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1087250/lmx2594evm-rf-output-impdedance/3913464Fri, 31 Jul 2026 01:03:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:62f0d442-5e40-4211-b58e-cc74b515f02fVivian GaoRefer to datasheethttps://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1087270/lmk04832-lmk04832-spi/3913454Thu, 30 Jul 2026 23:24:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:4c80eba9-d5a4-4448-a73f-cc7911799d43Lydia您好， 已 经 收到了您的案例， 调查 需要些 时间 ，感 谢 您的耐心等待。https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1087270/lmk04832-lmk04832-spiThu, 30 Jul 2026 12:22:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:f7dec22e-32a6-4488-b109-b57e91e9dd90SHUNDA ZHONGPart Number: LMK04832 您好： FPGA芯片（IO为1.2V）经过电平转换芯片（NLSX5014MUTAG）后由三线SPI配置加载LMK04832（3.3V供电），LMK04832可以正常加载且时钟也正常输出，但是三线SPI却无法回读LMK04832信息，请问是什么原因呢？数据通信模块LMK04832https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1087250/lmx2594evm-rf-output-impdedance/3913431Thu, 30 Jul 2026 07:51:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:fb91718f-ed57-4bbd-a6da-2686e511c0b9Vivian GaoThank you for your attention to TI products. We are verifying your issue, please wait for our reply.https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1087250/lmx2594evm-rf-output-impdedanceThu, 30 Jul 2026 07:47:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:cc5dea4e-9848-44a7-9bca-8064751ab310Jifei ChenPart Number: LMX2594EVM Other Parts Discussed in Thread: LMX2594 Hello, One month ago, I asked one tech issue about LMX2594 chip RF output power. Today, I have another tech issue during design the circuits according to the schematic of LMX2594 EVB board. What's the RF output impedance of LMX2594 eval board? thanks, Jifeilmx2594工业自动化LMX2594EVMhttps://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1084301/lmx2594-what-s-the-power-output-for-915mhz/3913430Thu, 30 Jul 2026 07:31:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:095fefdd-e046-4e79-bbc3-b8db04fc7c39LydiaHi， For follow-up questions, you can continue to communicate with Noel Fung.https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1084301/lmx2594-what-s-the-power-output-for-915mhz/3913429Thu, 30 Jul 2026 07:03:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:d72e916b-c021-4ff8-bfae-d7913b747fbcJifei Chenhello， could you help to ask another tech issue as the below shown: what is the output impedance of RF output on the LMX2594 EVB board schematic? thanks, Jifei Chen