https://e2echina.ti.com/support/clock-and-timing/zh-CNTelligent Community 13https://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 Chenhttps://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086779/cdclvc1310-cdclvc1310/3913425Thu, 30 Jul 2026 06:33:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:4657e7d4-c8f4-4fd3-8e5f-a6ab6e0c7c31user1391108你们有试过20M晶体吗？是否可以起振？我们换了48M晶体能起振，但20M不行。https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1087045/cdclvd1216-cdclvd1216/3913414Thu, 30 Jul 2026 04:27:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:4514766d-d8b5-43f4-8e02-955d79b35cbaVivian Gao1. 不建议，建议您按照手册来做。如果过小可能导致反射大，过驱。 2. 您的INP0和VAC_REF0应该按照您的截图里面的Figure 17电路结构去设计。 INP1如果不用，接1k下拉符合要求。 e2e.ti.com/.../624066 VAC_REF1如果不用，见下方链接的接法。 CDCLVD1216: what to do with VAC_REF0/1 when not used? - Clock & timing forum - Clock & timing - TI E2E support forumshttps://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086779/cdclvc1310-cdclvc1310/3913412Thu, 30 Jul 2026 04:18:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:cfb6ff58-d95d-439b-a46b-04fb70754656FRANK1如果你换了推荐的晶振也不好用，那再查查电路，走线， 你看看我给你的我们评估板的电路。排查下。https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1087045/cdclvd1216-cdclvd1216/3912640Wed, 29 Jul 2026 07:42:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:85f693d6-5a5b-476d-80d4-c11f5913e47eVivian Gao感谢您对TI产品的关注。 我们正在核实您的问题，请等待我们的答复。https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1087045/cdclvd1216-cdclvd1216Wed, 29 Jul 2026 07:34:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:968d6cbc-78ff-442e-a993-d1bbd55aaebeuser1359349Part Number: CDCLVD1216 TI的专家你好 请问CDCLVD1216 这个芯片， 1：如果输入信号是有源（3.3V）差分晶振提供的156.25M的LVPECL时钟，下图这个电子必须串接75R的吗，串接22R可以吗，如果串接22R，会导致什么后果？ 2：下图2中，圈出来的地方，设计是否正确 请帮忙看看，谢谢 x有线网络CDCLVD1216https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086779/cdclvc1310-cdclvc1310/3912636Wed, 29 Jul 2026 07:31:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:4e99f0c4-8d00-4489-b4b1-a2c844fc1539user1391108按照这个report更换了晶体，还是无法起振，晶体输入输出的波形如下，能否分析一下故障原因。https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086779/cdclvc1310-cdclvc1310/3912602Wed, 29 Jul 2026 00:27:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:0b117637-c014-4560-89ce-55d3f4a89820FRANK1你可以看看CDCLVC1310晶振的选型application report， CrystalOscillatorPerformanceoftheCDCLVC1310 https://www.ti.com/lit/an/scaa119/scaa119.pdf?ts=1785203514906 另外，你也可以看看我们评估版选择的晶振和设计电路，在下面链接文件的末尾有BOM和电路图。 www.ti.com.cn/.../scau046.pdfhttps://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086781/cdclvp1204-cdclvp1204rgtr-vacref/3911741Tue, 28 Jul 2026 05:51:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:34a71b22-6151-4ac7-ac8e-9841429cc0dbFRANK1你这种情况， VACREF引脚 可以floating。 (+) CDCLVP1204: unused Vac_ref pin - Clock & timing forum - Clock & timing - TI E2E support forumshttps://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086781/cdclvp1204-cdclvp1204rgtr-vacref/3911717Tue, 28 Jul 2026 02:13:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:e2ada75f-34f0-47bf-b87d-9c68e34eae8bFRANK1感谢您对TI产品的关注！ 关于你的咨询，我们正在确认您的问题，感谢您的耐心等待。https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086781/cdclvp1204-cdclvp1204rgtr-vacrefTue, 28 Jul 2026 02:11:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:ac3de7de-d907-4362-9f48-822666c86958Xu AllenPart Number: CDCLVP1204 你好， 请问一下，CDCLVP1204RGTR输入差分时钟信号是直流耦合、VCC=3.3V情况下，VACREF引脚的处理能否悬空？若不能，请问推荐如何处理？测试和测量CDCLVP1204https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086779/cdclvc1310-cdclvc1310/3911716Tue, 28 Jul 2026 01:49:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:a796c865-2a9c-4ff3-8cbf-dc5234770169FRANK1感谢您对TI产品的关注！ 关于你的咨询，我们正在确认您的问题，感谢您的耐心等待。https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086779/cdclvc1310-cdclvc1310Tue, 28 Jul 2026 01:47:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:f3be8315-6ba0-45d3-a637-d9e6a66b12e8user1391108Part Number: CDCLVC1310 cdclvc1310的11、12脚接20M晶体使用时，晶体无法起振，是什么原因？电路图及晶体规格书见下面的图，晶体的Rr小于等于50欧姆。CDCLVC1310数据通信模块https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086284/lmk3h2104-lmk3h2104-pin-configuration/3911713Tue, 28 Jul 2026 01:10:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:d4253091-e0b6-4874-b1d8-04f657a7a41akimi liangThanks for your reply, we can safely add the TI part to the replacement material.https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086284/lmk3h2104-lmk3h2104-pin-configuration/3911705Tue, 28 Jul 2026 00:24:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:61374e82-0af3-4a5e-99ae-74cdb40d9d46Vivian GaoHere is Cross-reference search results Cross-reference search | TI.com Regarding replacing the chip, we still recommend that you check the datasheet of the new chip first and do small batch testing before mass production.https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086602/lmx2820-lmx2820-r1-r0-2ms/3911081Mon, 27 Jul 2026 09:47:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:63c42f49-8f89-40af-95a5-7e76f82e0554Daniel您好 https://www.ti.com/lit/an/slyt169/slyt169.pdf?ts=1774926298209 请您参考这个说明https://e2echina.ti.com/support/clock-and-timing/f/clock-timing-forum/1086602/lmx2820-lmx2820-r1-r0-2msMon, 27 Jul 2026 07:47:00 GMT91561404-af28-475a-b96b-cb6cbaadd097:3fe2b2f9-bb3c-4b65-ace5-fe3c2746796buser6341179Part Number: LMX2820 这是我的配置寄存器表，在最后写入R0寄存器。 LMY2820_LO1_Write_one(0x4F011e); LMY2820_LO1_Write_one(0x4E0000|m); LMY2820_LO1_Write_one(0x4D0708); LMY2820_LO1_Write_one(0x4A0008); LMY2820_LO1_Write_one(0x4600FE); LMY2820_LO1_Write_one(0x440020); LMY2820_LO1_Write_one(0x400080); LMY2820_LO1_Write_one(0x2D46DC); LMY2820_LO1_Write_one(0x2C0003); LMY2820_LO1_Write_one(0x2B0000|Ml);// LMY2820_LO1_Write_one(0x2A0000|Mh); LMY2820_LO1_Write_one(0x2786A0);//·??=100000 LMY2820_LO1_Write_one(0x260001); LMY2820_LO1_Write_one(0x240000|N); LMY2820_LO1_Write_one(0x233100); LMY2820_LO1_Write_one(0x220010); LMY2820_LO1_Write_one(0x210000);//--------------------------------------- LMY2820_LO1_Write_one(0x201001); LMY2820_LO1_Write_one(0x1F0401);//--------------------------------------- LMY2820_LO1_Write_one(0x1EB18C);//--------------------------------------- LMY2820_LO1_Write_one(0x1D318C);//--------------------------------------- LMY2820_LO1_Write_one(0x1C0639);//--------------------------------------- LMY2820_LO1_Write_one(0x1B8001);//--------------------------------------- LMY2820_LO1_Write_one(0x1A0DB0);//--------------------------------------- LMY2820_LO1_Write_one(0x190624); //--------------------------------------- LMY2820_LO1_Write_one(0x180E34);//--------------------------------------- LMY2820_LO1_Write_one(0x171102);//--------------------------------------- LMY2820_LO1_Write_one(0x16E2BF); LMY2820_LO1_Write_one(0x151C64);//--------------------------------------- LMY2820_LO1_Write_one(0x14272C);//--------------------------------------- LMY2820_LO1_Write_one(0x132120);//--------------------------------------- LMY2820_LO1_Write_one(0x120000);//--------------------------------------- LMY2820_LO1_Write_one(0x1115C0); LMY2820_LO1_Write_one(0x101708); LMY2820_LO1_Write_one(0x0F2001); LMY2820_LO1_Write_one(0x0E3001);//2????? LMY2820_LO1_Write_one(0x0D0038); LMY2820_LO1_Write_one(0x0C0408); LMY2820_LO1_Write_one(0x0B0602); LMY2820_LO1_Write_one(0x0A0000); LMY2820_LO1_Write_one(0x090005);//--------------------------------------- LMY2820_LO1_Write_one(0x08C802);//--------------------------------------- LMY2820_LO1_Write_one(0x070000);//--------------------------------------- LMY2820_LO1_Write_one(0x060A43);//--------------------------------------- LMY2820_LO1_Write_one(0x050032);//--------------------------------------- LMY2820_LO1_Write_one(0x044204);//--------------------------------------- LMY2820_LO1_Write_one(0x030041);//--------------------------------------- LMY2820_LO1_Write_one(0x0281F4); LMY2820_LO1_Write_one(0x0157A0); delay_ms(2); LMY2820_LO1_Write_one(0x006074); delay_us(200);测试和测量LMX2820