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The ADAU1442 / ADAU1445 / ADAU1446 are enhanced audio processors that allow full flexibility in routing all input and output signals. The SigmaDSP® core...
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ADAU1446 SPDIF recovered Clock as Master

		
	
				

			

									
					    Brettcoupe
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 10, 2016 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    Hi
    
 
    Is it possible you use the recovered clock from the SPDIF receiver to be the clock source for the SDATA and DSP Core
    
 
    My Project uses external Codec IC  as a slave that is connected to SDATA , and just one SPDIF I/O interface
    
 
    So If I can Clock the Codec IC and The DSP from the Recovered SPDIF clock then I wont need SRC.
    
 
    Is this Possible , I cannot see where to set the Clock domains to the SPDIF recovered clock.
    
 
    Thanks
    
 
    Brett
    
			
    
			
									
		                             
                        

    
    
                                            
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      •  Analog Employees  
      •  Super User  
      
            
						
                            
            
            				
            
                on Jan 14, 2016 11:05 PM
            
            
						
			            		
      
		
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      Hello Brett,
      
 
      I have not tried this myself yet so I might have a detail missing but give this a go.
      
 
      The DSP start pulse register is where you will tell it to get its clock rate from the SPDIF. See table 12 in the datasheet. It is Register 0xE220 and you will see setting 0b11011 is from the SPDIF.
      
 
      So the clocks to the CODEC you can simply set to use the DSP rate and I am pretty sure it will follow it.
      
 
      So give that a try and I think it should work.
      
 
      The only issue you may run into is that when you lose SPDIF you will lose all your clocks. So the CODEC will lose its clocks and you may end up with DC on the output when it stops seeing clocks. You could have some clicks or pops. Try it and let me know what happens.
      
 
      Dave T
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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                on Feb 29, 2016 12:40 PM
            
            
						
			            		
        
		
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        Hi Dave
        
 
        Sorry I did not reply, I have not tried this idea as yet, 
        
 
        Thanks for the Info. And will advise soon
        
 
        Regards
        
 
        Brett
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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