Part Number:TLV320AIC3206
Set the contents of the voice data to 0, the Voice data is transmitted to TLV320AIC3206 DAC. but we measured 100mv of noise on the HPL.Because the data parts are all zeros, so we can't understand why there's noise。We want to get some help。
Here is our configuration frame:
w 30 00 00
w 30 01 01
/*————–PLL—————*/
//p=1 r=4 j=27 d=0
w 30 04 03
w 30 05 94
w 30 06 1B
/*————-DAC ADC————*/
//NDAC = 1; MDAC = 35; DOSR = 768
w 30 0B 81
w 30 0C A3
w 30 0D 03
w 30 0E 00
//NADC = 2; MADC = 105; AOSR = 128
w 30 12 82
w 30 13 E9
//select DAC PRB_P7 DAC signal Proc
w 30 3C 07
//write to Buffer A:
w 30 00 2C
//BIQUAD A Left Channel
w 30 0C 7C 73 E4 00 C1 C6 0F 00 00 00 00 00 3C 73 E6 00 00 00 00 00
//BIQUAD A Right Channel
w 30 14 7C 73 E4 00 C1 C6 0F 00 00 00 00 00 3C 73 E6 00 00 00 00 00
//select ADC PRB_R1 ADC signal Proc
w 30 3D 01
/*———–POWER————*/
w 30 00 01
w 30 01 08
w 30 02 00
w 30 0A 00
w 30 3D 00
w 30 03 00
w 30 04 00
w 30 47 32
w 30 7B 01
/*———–IN1—-ADC——–*/
w 30 00 01
w 30 34 80
w 30 36 80
w 30 37 80
w 30 39 80
w 30 3B 0C
w 30 3C 0C
w 30 00 00
w 30 51 C0
w 30 52 00
/*———–HPL——–DAC—–*/
w 30 00 01
w 30 14 25
w 30 0C 08
w 30 0D 08
w 30 09 30
w 30 10 3A
w 30 11 3A
w 30 00 00
w 30 41 07
w 30 42 07
w 30 3F D6
w 30 40 00
Amy Luo:
您好,
除了在输入data数据为0时输出不为0,其他方面工作正常吗?
您可以将在HPL测得的噪声波形附上吗?这有可能是输出走线上耦合的其他噪声
,
z j:
其他方面工作正常 ,噪声波形图如下:
,
Amy Luo:
通过下面FAQ可以知道最常见的原因有5个方面
https://e2e.ti.com/support/audio-group/audio/f/audio-forum/901452/faq-audio-codecs-and-adcs-common-noise-issues
1、带外噪声
2、PLL配置不正确
3、ASI(音频串行接口)配置不正确
4、地平面噪声耦合
5、电源
因此,建议您从这5个方面检查。
MCLK、WCLK、BCLK频率实测是多少?实测波形上存在干扰吗?采样率是多少?供电电源实测纹波幅值多少