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TAS2553: TAS2553输出幅度,波形失真

Part Number: TAS2553

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上面是输出波形与相关寄存器设置,波形输出有点失真,幅度调不大,目前电源声压到7.5V正常,就是调增益也调不大,调大了就失真了,limiter已经禁止了,请看上面的寄存器,请帮忙看看是什么原因?非常感谢