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TLV320AIC3105噪音问题请教

Other Parts Discussed in Thread: TLV320AIC3105

我在使用EP94Z3E这颗芯片和TLV320AIC3105的I2S通信。EP94Z3E切换或关闭视频时,I2S时钟信号会变化(时钟等比例降低),无数据信号。程序中TLV320AIC3105未使用MCLK,测试中发现TLV320AIC3105开始启动时必须要MCLK时钟,后面才切换成其他的时钟。我们使用外部晶体给主时钟,但是无显示时,外部的BCLK和WCLK会变化,即使无数据,还是有噪音产生。断开I2S,使用模拟输入,TLV320AIC3105无噪音。请教一下如何能除去I2S端时钟信号变化引起的噪音