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PCM1864是否能够使用无源MIC?

Other Parts Discussed in Thread: PCM1864

我在使用PCM1864时发现个奇怪的问题,使用无源MIC时无法正常使用,切换到有源MIC后则能够正常使用。

我的相关设计完全按照开发板来做的。MICBIAS的电压也是对的。

想请问一下,这种现象正常吗?还是有哪里需要设置呢?

谢谢!

  • 手册给出说明:
    The PCM186x can provide a microphone bias to power and bias microphones at 2.6 V on pin 5. Decouple or filter the Mic Bias pin with an external capacitor. Mic Bias is typically used with a electret microphone.
    就是说, 可以直接支持驻极体话筒
  • 支持的,The PCM186x software programmable devices support electret condenser mics through a mic bias circuit and a
    PGA input providing up to 32 dB of gain.
    您目前使用无源mic遇到了什么问题呢?把模拟输入PGA增益设置到20dB~32dB试试呢?
  • 我在使用无源MIC调试时接收不到音频信号,用示波器测试输入信号也几乎测试不到信号。把模拟输入PGA增益调大了也没反应,只是出现了一些噪声。不知道会是哪儿出了问题。

    谢谢!