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音频DAC输出有效值的问题

Other Parts Discussed in Thread: TLV320DAC23

 LTV320DAC23数据手册上说作为line out输出时候其电压值为1Vrms。我对这个不太理解,改变输入的DAC代码,输出也不变吗,始终为1Vrms?输出可以为负值吗?我想要的是输出可以随输入的DAC代码的改变而在一个正负电压范围内改变,且直流偏置为0,用这个芯片是不是不合适?