Signal Routing Options For the ADAU1787 DSP

Hi All,

I am new the ADAU1787 and completed my first signal route successfully yesterday. I was able to send audio through my ADAU1787Z development board without issue. I setup a signal into AIN2/3 J22 from a tablet headphone jacket and routed it to Stereo Out J23 to headphones. I am glad that this board is working properly and now have to proceed to making it process a bunch of signals. I have been through and viewed the tree of design blocks in the toolbox and see that there are two primary groups sigma and fast. I have also viewed all of the tabs in the hardware configuration including the main CTRL tab which appears to be an overview of all possible routes through the DSP for signals and a visual guide to what connections and processors are on and off via switches.

After going through all of this yesterday and thinking about all the applications I'd like to use this for I realized that it might be helpful to make a simple input and output map that includes what routing is handled by the main schematic that I draw, what part is handled by the Main CTRL, what is handled by other tabs to help as I grow my understanding of this DSP. I have some initial question that related to the difficulty that I had after my first project yesterday that have to do with the flow between the two DSPs in the IC.

The first configuration that I tested yesterday was with the schematic connected:

AIN2/3 -> ADC2 and ADC3 this went directly to the DAC0 and DAC1 and was heard on the other side.

There is no line on the Main CTRL tab that shows that a direct route is possible around the SigmaDSP and FastDSP. I did do some trouble shooting and found that the signal would still work if the fast DSP was off but would not work with the Sigma DSP off. Is it correct to say that the signal was routed:

AIN2/3 -> ADC2 and ADC3 -> Sigma DSP ADC -> Fast To Slow Decimator -> to the DAC0 and DAC1?

Best Regards,

Dean

ADAU1787

Integrated/Special Purpose A/D Converters

Audio CODECs