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PCM3500的loop引脚不能实现AD-DA的检测

Other Parts Discussed in Thread: PCM3500

小弟在使用PCM3500E做音频编解码,在使用PCM3500的过程中,将LOOP置1,其他引脚配置正确,将1khz信号的正弦信号输入模拟接口,再将用示波器加在模拟输出端,不论是否有输入信号都有大约128KhzDE杂波存在,用大约20khz低通滤波器之后就什么波形都没有了,没有达到预期的loop环路检测效果。原理图如下: