TLV320AIC3101输出杂音的问题？

我在调试TLV320AIC3101时发现输出有杂音,我用示波器看发现是三角波.

我的TLV320AIC3101的配置是:

Write_1_Bit(1,0x80);         //软件复位

  Write_1_Bit(2,0x00);

  Write_1_Bit(3,0x91);         //PLL使能P配置

  Write_1_Bit(4,0x20);         //J配置

  Write_1_Bit(5,0x1e);         //配置D=1920

  Write_1_Bit(6,0x00);         //配置D

  Write_1_Bit(7,0x0a);         //fs=48khz,

  Write_1_Bit(8,0xf0);  

  Write_1_Bit(9,0x00);

  Write_1_Bit(11,0x01);       //配置R

  Write_1_Bit(15,0x00);       //unmute left PGA set gain to 0 dB

  Write_1_Bit(19,0x04);       //配置MIC1LP/L_AD

  Write_1_Bit(24,0x80);      

  Write_1_Bit(25,0x40);      

  Write_1_Bit(37,0xc0);      

  Write_1_Bit(43,0x00);      

  Write_1_Bit(47,0x80);

  Write_1_Bit(51,0x09);       //HPLOUT

 Write_1_Bit(101, 0x00);    

我是48KHZ/16BIT的采样，从MIC1LP/LINE1LP通道输入声音，再从HPLOUT输出.

我的DSP只是进行了数据的转换.

void I2S_AIC3101(void)

{

   SPI2BUF=data;

   while(SPI2STAT==0x849){}

   SPI2STATCLR=0x40;

   data=SPI2BUF;

}

是不是我配置的出错了啊?

输出的三角波杂音在6.8KHZ到17KHZ之间.这样的杂音是怎么出来的那?