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急，急：PCM9211的ADC Detect 功能

ming Liang3
Prodigy 110 points
Other Parts Discussed in Thread: PCM9211

PCM9211有个ADC Level Detect and Interrupt功能，想把它做到无信号自动待机，但是我在设定Level Detector值至-48dB时，低信号时INT1仍然无电平跳变（即PCM9211判定这时无信号输入），直至ADC输入信号电平很高时INT1才有电平跳变。请问怎样准确检测有无信号，做到无信号自动待机。请帮忙解答，谢谢！