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请教一下PCM1780输出信号是载波,该怎么设置呢?

Other Parts Discussed in Thread: PCM1780

最近使用PCM1780这个IC,发现在14,15脚VOUT输出的信号都是载波,怀疑是PCM1780内部的低通滤波器没工作。我设置了FLT也无用。用官方推荐的外部滤波电路也没办法把载波完全滤干净。请教一下这个想象是否正常。还有哪里可以设置的呢?

以下是PCM1780----14脚 OUT的输出信号