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PCM5121硬件模式下DOUT无输出

Other Parts Discussed in Thread: PCM5121

你好,我在使用PCM5121,工作在硬件模式,我希望既有模拟输出,同时也需要有一路数字i2s输出。根据datasheet,硬件模式下16脚默认就是DOUT,但是我测量发现DOUT无任何波形输出,而我I2S输入和模拟输出都是正常的。是不是硬件模式还需要配置什么才能让16脚DOUT有输出吗?望高手指导解答一下。感谢