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使用tlv320aic3206采集送话器音频信号，信号为8mv~20mv单端信号，请问信号是否需要使用放大器进行预放大，还是直接输入aic3206 就可以？
器件内部在 ADC 之前有个 PGA 做信号预处理，最大可以到 47.5db的增益，应该可以满足信号放大的要求
