4 group I2S in adau1451 , only SDATA_IN0 works

Hello,

I am using ADAU1451,  there 4 audio sources,  AUX/SPDIF/USB/ WIFI.

AUXIN -->ADC-->SDATA_IN3   

USB (I2S)--> SDATA_IN2

WIFI(I2S)-->SDATA_IN0

SPDIF--> ASRC INPUT 0/1

Now , WIFI(I2S)-->SDATA_IN0  works,  

SPDIF--> ASRC INPUT 0/1  works

but  SDATA_IN2 / SDATA_IN3   no sound . which the BLCK/LRCK/DATA  tested by  AP , is fine.  but even in sigma 4.4 , use the level monitor  no signal  in at all.

donot know why.

Thanks 

Meican.

 

Parents
  • +1
    •  Analog Employees 
    on Nov 25, 2019 9:20 PM

    Hello Meican,

    This will be a master clocking issue most likely. 

    You did not specify what was a master for clocks and what is a slave. 

    You have three sources where it will be impossible to have them synchronous to the same master clock, so you will have to use the ASRCs for all three of them. 

    SPDIF (you already are using the ASRC on this one)

    WiFi

    USB.

    For the AUX in You have a choice. The ADC can be the master. If you are planning on using high sampling rates, like 192kHz or even 96kHz, you would be advised to have the ADC be the master. Then you can slave the entire DSP off of that clock rate. 

    Draw up a clocking diagram.

    Also, attach your project. It will answer a lot of questions.

    Dave T

Reply
  • +1
    •  Analog Employees 
    on Nov 25, 2019 9:20 PM

    Hello Meican,

    This will be a master clocking issue most likely. 

    You did not specify what was a master for clocks and what is a slave. 

    You have three sources where it will be impossible to have them synchronous to the same master clock, so you will have to use the ASRCs for all three of them. 

    SPDIF (you already are using the ASRC on this one)

    WiFi

    USB.

    For the AUX in You have a choice. The ADC can be the master. If you are planning on using high sampling rates, like 192kHz or even 96kHz, you would be advised to have the ADC be the master. Then you can slave the entire DSP off of that clock rate. 

    Draw up a clocking diagram.

    Also, attach your project. It will answer a lot of questions.

    Dave T

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