• ADF4156

    I wonder what is the Frequency Switching Time of  ADF 4156 and what is the max hop rate


  • RE: ADF4156 eval. board


    Our apologies for the delayed response...

    The  EV-ADF4156SD1Z board contains the ADF4156 synthesizer, an SMA connector for the output signal, power supplies, a reference oscillator, and an SDP connector. There is also a loop filter (20 kHz) and…

  • 关于ADF4156不能锁定的问题



  • 关于ADF5001和ADF4156的连接问题


    关于ADF5001和ADF4156的连接,参考设计上给的是最好用差分线来连接,但是没有给出如何详细的布设这一差分线,感觉这个应该比较重要,不知到有没有详细的参考设计图?我是个新手,对这个还不是太清楚,根据我的理解ADF5001差分输出阻抗是100欧,那在pcb板上如果使用微带线的话,对应于RFout - RFinA,和RFOUT_N - RFinB的微带线特征阻抗是不是应该设计成50欧,还有这个连接需不需要终端匹配? 如果需要的话应该如何进行匹配?


  • ADF4156 Design Issue at 1911.642 MHz


    I've been using ADF4156 to design Local Oscillators at frequencies in the range of 5 to 6 GHz.

    I use ADISimPLL and Fraction N software for the design.

    I haven't faced any difficulties in the LO design at the above mentioned frequencies;…

  • ADF4156 phase resync

    ADF4156 Phase Resync Operation

    I am having a problem that the output phase can only keep its relation to
    the ref phase for about one minute after phase resync operation. How can I
    make sure the phase relation is matched all the time? I followed the

  • Phase consistency between two ADF4159/ADF4169 PLLs

    Is it possible to achieve phase consistency between two
    ADF4159/ADF4169 PLLs ?

    Two ADF4156 PLLs can be programmed to achieve phase consistency, in the datasheet this is explained in the PHASE RESYNC section. Unfortunately the ADF4156 does not have any…

  • RE: CN0174 schematics

    Hi Payam,

    The circuit described in Figure 3 of CN0174 consists of several PC boards connected together.

    We do not have complete schematics for the entire system, but we do have documentation for the individual evaluation boards for the ADF4156 and the…



    Finally I could find out the problem.The pad of LNA detached (very very small portion) from the body.The image attached is taken using a magnifier having 110 zoom.HMC 587 output is divided using stripline power divider and given to ADF4156 and…

  • RE: ADF4151 intermittent elongated lock time problem


    Let me join your discussion. I have similar problem with my ADF4156 chip. It sometimes locks to a wrong frequency. I try to make a periodic frequency modulated signal of two (close enough) RF frequencies. Each frequency step period is around 20us…