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TMS320C5402外接三片DAC(AD5547),生成波形不定时会有杂讯



做个信号发生器, 生成6路正弦波时,有时会有杂讯,有时又好好的;有时上午有\下午没有杂讯, 有时今天有,明天又看不到. 见图,好奇怪.有做类似项目的朋友多指导.我的油箱: guohuimao@163.com