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ADAU1772 Production
The ADAU1772 is a codec with four inputs and two outputs that incorporates a digital processing engine to perform filtering, level control, signal level...
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ADAU1772 on Analog.com

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I2S Master stream

		
	
				

			

									
					    kozzy
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 22, 2025 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user is trying to configure the ADAU1772 as an I2S master on the ADAU1772Z dev kit but observes the same I2S data stream with or without music playing. The final answer clarifies that the pin names are confusing, with ADC_SDATA0 (pin 43) being the core output if configured correctly. The engineer provided an edited project file to test and troubleshoot the issue, suggesting the addition of mutes for channel verification.
                        	    
    
                
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    Product Number:  ADAU1772  
    
    		        		    		    
    
		    		    
		    			
    
			    
    I am trying to configure the ADAU1772 as an I2S master (currently using the ADAU1772Z dev kit). My schematic is a simple passthrough and would like to see the core output be routed through an I2S stream. When I probe the output stream with a logic analyzer, regardless whether there is music playing or not, the data stream is the same. Can someone advise on this, thanks! I have attached my sigma-studio file, as well as screen shots of the i2s stream output below:
    

    

        
    

    

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    Design 1.dspproj
    

    

    
			
    
			
									
		                             
                        

    
    
                                            
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      •  Analog Employees  
      •  Super User  
      
            
						
                            
            
            				
            
                on Oct 24, 2025 4:39 PM
            
            
						
			            		
      
		
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      Hello kozzy,
      

      Which pin are you looking at with the scope?
      

      Because, the pin names are about as confusing as it can be. The Serial output port pins are called ADC!!!  It is listed in the datasheet:
      

       
      

      Pin 43, ADC_SDATA0 is for the ADC Serial Data Output0 but only if you select it to send out the ADC data!! Otherwise, it is the output of the core if that is what you chose. 
      

      

      I edited your project to test it on my eval board. 
      

      Since the eval board is setup to accept a stereo signal on a 3.5mm jack I summed the other two ADCs so I could see a signal. 
      

      I also added two mutes which is handy for troubleshooting and verify the channels are what you think they are.
      

       
      

      Here is my project in case you want to look at it. 
      

       ADAU1772 Design 1 Oct 2025-DT-Edit.dspproj
      

      

      Dave T
      

      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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