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LMX2491使用问题

Other Parts Discussed in Thread: LMX2491

我们现在使用LMX2491控制输出频率1500MHz,基准频率是40MHz,PLL_N = fVCO / fPD = 1520/20=76,//PLL_R = fOSCin / fPD = 40/20。我把R16、R17、R18、R19、R20、R21、R22、R23、R24、R25、R26、R28、R31、R33、R34、R35、R39。我用示波器查看了SPI时序没有什么问题,但是现在LMX2491一点反应都没有。请问LMX2491设定完这些寄存器后,他自己就会工作吗?