線路設計(如附件)依照LMX2492EVM,但量測PIN_CPOUT一直是處於低位準,而導致PLL無法LOCK
請問,我該怎麼做修正?
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線路設計(如附件)依照LMX2492EVM,但量測PIN_CPOUT一直是處於低位準,而導致PLL無法LOCK
請問,我該怎麼做修正?
晶振输入都没问题吧? VCC_CP电压正常吧?POWERDOWN bit有没有正确配置?
POWERDOWN bit R2為0x000201:
R2寄存器,bit2为SWRST, SWRST=0 为normal operation。
bit[1:0]为powerdown控制,当为1即01时为power up。因此Reg R2为0X01h。