TLV320AIC3204 PDM Interface format

你好!我在技術文件中找不到AIC3204的PDM格式是多少Bit?是16bit嗎?還是能自行設定

user151383853：

是说 DATA-LEFT, 或 DATA-RIGHT的长度吗?
The audio bus of the TLV320AIC3204 can be configured for left or right-justified, I2S, DSP, or TDM modes of operation, where communication with standard telephony PCM interfaces is supported within the TDM mode. These modes are all MSB-first, with data width programmable as 16, 20, 24, or 32 bits by configuring Page 0, Register 27, D(5:4). In addition, the word clock and bit clock can be independently configured in either Master or Slave mode, for flexible connectivity to a wide variety of processors. The word clock is used to define the beginning of a frame, and may be programmed as either a pulse or a square-wave signal. The frequency of this clock corresponds to the maximum of the selected ADC and DAC sampling frequencies.

Chu Stanley：

回复 user151383853:

hi 謝謝您的回覆

您提供的是指digital interface的格式,它包含了I2S DSP TDM等等,這個部分在Datasheet裡有明確標註,但是PDM(Digital microphone interface)的規格沒有標註,我想知道的是,AIC3204的PDM是否可以定義成16或24bit?如果可以,如何設定? 謝謝^^

user5142806：

PDM数据位数没有明确的规定，这个要配置时钟，根据时钟频率和采样率计算。比如说主时钟16M，采样率16k,pcm数据为16bit,那么就是将16M/16K个时钟对应的PDM数据解码转换为一个16bit 的PCM数据，也就是说PDM位数是16M/16K。