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TUSS4470: 多个TUSS4470同时使用会出现信号串扰

Part Number: TUSS4470

同时使用多个tuss4470,且电源分别单独供电,在vout接收的包络信号会出现信号串扰,示波器上显示为一个周期性的扫频信号叠加在正常波形上,这是什么原因