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使用TLV320AIC26,需求的MCLK的问题

Other Parts Discussed in Thread: TLV320AIC26

使用TLV320AIC26做codec编解码。当前无论怎么设置都无法工作。查原理图后发现硬件上MCLK被悬空了。请问一下,MCLK pin是否必须接入时钟信号,如果不是必须的话,寄存器上要怎么设置?如果MCLK必须接入时钟信号的话,这个时钟的频率和振幅电压有什么要求?