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LMK04828 PLL2无法LOCK

Other Parts Discussed in Thread: LMK04828, CODELOADER

TI工程师,

              你们好!我在配置LMK04828时,使用单PLL模式(PLL2),PLL1 powerdown.PLL2的鉴相频率设定为100M!通过示波器观测时钟有输出。但是Status_LD2引脚(已经配置为pll2 lock标志)为低,读取0x183寄存器,寄存器值也为0x00,表明PLL2未锁定!!

            反复看datasheet,看到LOCK信号与PLL2_DLD_CNT设定有关.

              设定50ppm,得到PLL2_DLD_CNT为1850,不知道这样设置是否合适.

               还有环路滤波参数选择会影响PLL2 LOCK ?

               配置文件见附件(去除后缀.txt即为配置的mac文件)

              期待您的回复!!