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RC4558: THD失真偏大

Part Number: RC4558

Hi TI Team,

客户在使用RC4558时,部分IC出现失真偏大问题,偏大丝印为8B ,THD到0.15%~0.25%.请问这正常吗?

失效IC失真度在0.15%~0.25%,如下图:

正常IC失真度<0.02%,如下图: