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问题: AD9518内部锁相问题

Run 在 2012-12-26 詢問的問題
最後回覆由wangmigooo於2013-1-11提供

版主好:
现在使用AD9518-1,REF1输入频率为40M,R
divider设置为8,A=0,B=15,P=32
想用内部锁相环和VCO输出2.4G,内部锁相环已经设置为on。VCO也已经可以校准。
读取0x01F的值为0x4E,锁相环未锁定,请指教!
寄存器设置如下
AD9518_WDATA(0x00,0x00,0x18);

 

AD9518_WDATA(0x00,0x10,0x7c); //PLL enable
AD9518_WDATA(0x00,0x11,0x08);
//01 R=8
AD9518_WDATA(0x00,0x12,0x00);
AD9518_WDATA(0x00,0x13,0x00); //
A=0
AD9518_WDATA(0x00,0x14,0x0F); // 0C B=15
AD9518_WDATA(0x00,0x15,0x00);
//00
AD9518_WDATA(0x00,0x16,0x06); //P=32
AD9518_WDATA(0x00,0x17,0xA8);
//status
pin
AD9518_WDATA(0x00,0x1A,0x00);
AD9518_WDATA(0x00,0x1B,0x81);
AD9518_WDATA(0x00,0x1C,0x06);
AD9518_WDATA(0x00,0x1D,0x00);
AD9518_WDATA(0x02,0x30,0x04);
AD9518_WDATA(0x01,0xE1,0x00);
AD9518_WDATA(0x02,0x32,0x01);
Delay(500);Delay(500);Delay(500);Delay(500);
AD9518_WDATA(0x00,0x18,0x06);
AD9518_WDATA(0x02,0x32,0x01);//write
to
reg
Delay(500);Delay(500);Delay(500);Delay(500);
AD9518_WDATA(0x00,0x18,0x07);
AD9518_WDATA(0x02,0x32,0x01);

結果