• AD9518-4 不能锁定的问题

    您好!

    我使用一块贵公司的时钟芯片AD9518-4来产生256MHz时钟,使用10MHz的参考信号。设置R=5N=768A=0 B=48 P=32)所以进入PFD的信号频率是2MHz2MHz,环路滤波器通带54.8kHz 相位裕量 40 deg使用ADIsimCLK设计。

    现在的问题是DLD显示低,寄存器0x01f最低位 锁定位也是0CP直流3.3V(最大能力提高VCO频率),使用Status管脚显示N分频器的输出,显示频率只有900kHz 左右 且不稳定(应该是2MHz)。设置寄存器参…

  • AD9518-4 不能锁定的问题

    您好!

    我使用一块贵公司的时钟芯片AD9518-4来产生256MHz时钟,使用10MHz的参考信号。设置R=5N=768A=0 B=48 P=32)所以进入PFD的信号频率是2MHz2MHz,环路滤波器通带54.8kHz 相位裕量 40 deg使用ADIsimCLK设计。

    现在的问题是DLD显示低,寄存器0x01f最低位 锁定位也是0CP直流3.3V(最大能力提高VCO频率),使用Status管脚显示N分频器的输出,显示频率只有900kHz 左右 且不稳定(应该是2MHz)。设置寄存器参…

  • RE: problem about AD9518-4 not to get locked

    Hi,

    Thank you for your reply! It helps a lot!

    What voltage should bypass pin be if locked? my AD9518-4 has a 0.85V in every Pin,both input and output.  Is there someting wrong? but the chip has responses to SPI settings

    Dose Lvpecl can be connnected to…

  • RE: How do I program  AD9518-4 from ADIsimCLK?

    Thank you for a very prompt answer!

    I have allready read the UG-075 and, of course, I could extract the

    information from the simulatins to the proper register settings.

    It would however reduce the human errors in the process and we would

    know that…

  • AD9518 Sync

    I Have two Ad9518's in different slots of my system that have the same 10mhz input clock in common. Both AD9518's are also configured to generate a 400Mhz clock on output 0&1. I'm trying to figure out how to phase align the outputs and I figured that…

  • AD9518 Calibration

    Hello,

    I’m using an AD9518-0 on my electronics board and now I’m facing some trouble to get the card “ready to serve” after an electrical reboot. In the FPGA connected to the AD9518-o(via SPI), I’m programming all the required settings right after the…

  • AD9518-1 Pinout

    The OrCAD Capture CIS symbol created by UltraLibrarian from AD9518-1ABCPZ.bxl has the inverting and non-inverting pins of output channels 0, 1, 2, and 3 opposite from what is show in the AD9518-1 datasheet. Can it be assumed that the datasheet is correct…

  • AD9518 VCO偶数分频失锁

    ad9518-4,改芯片用过好多次,这次应用不同需要输出800MHz。发现如下问题:

    将VCO的分频设置0x1e0到偶数分频(2、4)都不能锁定。其他设置不变,设置成奇数分频就没有锁不定的问题;

    观察输出800MHz信号,不是一点没有,频谱在800MHz上闪烁,时域波形800MHz时有时无;

    偶数分频时,有什么忌讳吗,请各位专家帮忙解答一下。谢谢!

  • RE: Timing parameter tc of Serial Control Port for AD9518-3

    Hi.
    Thank you for your reply.
    From Figure 51, I have thought that AD9518-3 samples on the rising edge of the SCLK.

    Is it true that AD9518-3 samples them on the negative edge of the SCLK.
    Thanks and Regards

  • AD9518-1 no output

    Hello,

    we design a system with ad9518-1, but AD9518-1 pin outputs DC 1.6V, and the complement pin output DC 2.4V,  no clock output, why?

    Thank you!