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PCM2912A: 如何通过PCM2912A实现PTT功能

Part Number: PCM2912A

想要通过PCM2912A实现拥有PTT功能的USB麦克风,芯片的USER GUIDE给到的电路是将mute引脚通过开关连接到SSPND上,这样默认为是开启的,按下后静音,如果需要实现PTT功能,就需要信号是反向的,这个有办法实现吗,该怎么更改,或者有其他芯片能实现这个功能吗