• LTC6947 + HMC508 PLL: side-band noise fluctuation

    Dear support,

    In my design a PLL is developed by using LTC6947 in conjunction with HMC508. The PLL is simulated with ADIsimPLL, and this loop has been implemented:

    The developed circuit is:

    and the CP is implemented with the component values suggested…

  • LTC6947配置寄存器编程C语言案列,

    我想输出1个1.25GHz的点频信号,鉴相频率为25M,输入参考频率为100M,请问有参考示例编程吗?现在配置寄存器有一些不明白的地方,还请高手指点,谢谢!

  • LTC6947 REFin best format: CMOS, LVDS or LVPECL?

    Dear support,

    I need to interface the LTC6947 PLL REFin with the LTC6954 Clock Divider output. In particular, the LTC6954 provides for a 100MHz REFERENCE signal for the LTC6947.

    Since LTC6954 can provide 3 different format for the output signal, the question…

  • LTC694x Loop Filter Design and Simuation

    What loop filter design tool should I use for LTC694x PLLs and PLL/VCOs? 

    The short answer is:

    LTC6945, LTC6946: Either PLLWizard or ADIsimPLL

    LTC6947, LTC6948: Either FracNWizard or ADIsimPLL

    ADIsimPLL (https://form.analog.com/Form_Pages/RFComms/ADISimPll…

  • PLL device selection for frequency comparison circuit

    Hi,

    A university research institute is currently designing a frequency comparison circuit. They would like to compare the frequency between a 40MHz reference signal and a 40 + α MHz signal, and get the error signal from the charge pump output. For example…

  • RE: LTC6948 vco output frequency offset in Fractional-N mode ?

    I've been supporting this part for almost 8 years and you are only the 3rd customer to notice this!  Nice job.

    With the LTC6948 there is <=1/4 LSB frequency error with respect to the register field NUM (i.e. the fractional setting).  This error is…

  • RE: ADF4360-1 behavior at 2098 MHz (edge of VCO bands) during REFin drift

    Ivan,  That is a typical plot of typical part at typical temperature.  That VCO transitions in the plot will vary some over Process Voltage and Temperature.  I have not worked on the ADF4360 directly, but I'm going to assume its VCO calibration is like our…

  • TAGS LIST: Clock and Timing

    LTC6953
    LTC6955
    LTC6957-1
    HMC6832
    HMC7043
    LTC6950
    LTC6954
    HMC987
    AD9576
    AD9508
    HMC1035
    HMC988
    HMC1033
    HMC1034
    HMC1032
    HMC1031
    ADN4670
    ADCLK944
    ADCLK950
    ADCLK948
    ADCLK846
    ADCLK954
    ADCLK946
    ADCLK854
    AD…
  • Q1: Cannot load COM Module

    If you receive a Cannot load COM module error message when trying to install a driver for a demo board using QuikEval, the following locations can be used to manually install the COM module. After downloading the module, run the installer and the software…