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PCM5102A: PCM5102A增益问题

Part Number: PCM5102A
Other Parts Discussed in Thread: PCM5100

请教一下大佬们,soc输出的iis音频数据给到PCM5102A,PCM5102A再输出给外置车载功放,整条音频链路输出增益不够,外置车载功放增益已经最大了;有什么方法可以增大增益呢