AnsweredAssumed Answered

16 Input / 16 Output Mixer with AD1939 + AD1974

Question asked by jorpese on Nov 21, 2013
Latest reply on Jan 15, 2014 by jorpese

Hi there,

 

I am designing a digital audio mixer with 16 audio input channels and 16 output channels. A combined DSP/ARM provides processing and Ethernet capabilities.

 

In order to speed up the process, I'm using a module that includes an OMAPL138. In the module interface I have got available up to 8 McASP channels. Using I2S I could not transmit all the 32 channels. Thus, I would need to use a TDM8 or TDM16 format. TDM 8 will reduce the emissions.   

 

I want to use the AD1939 codec but I would need 4 extra inputs. I was thinking on using a AD1974 to provide those extra inputs but I'm in doubt of what would be the best way of connecting the codecs.

 

Would it be possible/right to connect two AD1939 in parallel, each of them with their own auxiliary AD1974, like in the diagram? Is the diagram correct, using ASDATA1 and ASDATA2, in I2S mode or is there a better way?

 

 

 

Note: I have not connected the 12.288MHz as it seems that is not really necessary for the McASP ports.

 

Would it be necessary to use some kind of clock buffering/distribution?

Attachments

Outcomes