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我使用了的LMK04806B,设计时对PLL1和PLL2的loop filter的值不知该如何设置,C1/C2/R2该如何选择手册也没有明确写明,请高手指教!
你可以使用TI的在线时钟设计仿真工具,在官网上查找LMK04806,在webench窗口里输入你的频率需求,点击open design,出来的窗口里再点击open design,在新出来的窗口中间就可以LOOPFILTER里面找到参数,也可以自己调整。
http://www.ti.com/product/LMK04806?keyMatch=LMK04806&tisearch=Search-EN-Everything
我用CLOCKDESIGNTOOL 试一下,因为这个工具也适用于双PLL的LMK04800系列的滤波器设计,其中这个user's guide中说的KVCO是根据VCO变化自动设置的
The tuning sensitivity (KVCO) is automatically linearly interpolated over the range of the VCO.