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cc3200 使用的音频codec AIC3254输出噪声太大

Other Parts Discussed in Thread: CC3200

您好,我们cc3200 使用的音频codec AIC3254输入端基本没有噪声,ADC也做了抑制,HP/LO也做了较大抑制,DAC放大倍数也较小,但输出端噪声依然很大,请问有什么原因可能导致输出噪声大?