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TAS5701各电平正常但无输出

Other Parts Discussed in Thread: TAS5701

参照TI的EVM板子画了一份pcb,测试发现输出差分音频无信号。信号输入选用I2S格式,FORMAT0、1、2=001,GAIN0、1=11。有I2S信号输入时,OUT引脚对地恒定是占空比为50%的方波,VPP=15V,VALID=1,BKND_ERR=0,有点静音了的感觉,但是mute引脚已经置高。

现问题是有输入的时候没有输出,负载为4欧姆喇叭,附上原理图一份,望各位帮助。谢谢。TAS5701.pdf