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关于DAC,A,B,C通道问题



 DA    三个通道共同采取512个点  为一个完整的正玄波   都可以输出一个正玄波,但是A,C通道波形比较完善,B通道的波形毛刺比较明显,为什么呢?
之后我在B通道输出口加上了一个负载,不管好大B通道都无法输出波形了,为什么呢?
我用的是TMX28377D的芯片