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LMX2572: 手动扫频实现不了

Part Number: LMX2572

我们想从1G频率开始每1ms步进1kHz,按照数据手册试过操作各种寄存器都无法实现,现在只能实现输出一种频率,只要重新设置相同或不同的频率输出都会直接没有输出了。我们是用单片机通过SPI口操作芯片,希望能提供扫频输出的C语言代码就最好了。谢谢