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EVAL-ADAU1772 50kHz sine wave input 3 and 4 Output has a modulated waveform that has a 2kHz message signal is it normal?

		
	
				

			

									
					    Poster
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on May 8, 2026 
				
			
			
		

		
		                     
				
        		

		    
		    		    

		      		            		        
Category: Hardware

    		        		            		    
Product Number:  ADAU1772  

    		        		    		    

		    		    
		    			

			    
Using EVAL-ADAU1772 and following the example in UG-477


When I insert a 50kHz sine wave at the input of 3 and 4 I get a frequency modulated output with 50kHz as my carrier frequency, and there is a 2kHz message frequency,


Was wondering where the 2kHz message frequency came from, which parameter in the register decided this.


I'm happy that the IC is responding to my configuration but wanting to learn more about the IC, 


Thanks


 


 

			

			
									
		                             
                        

    

                                            
                 hardware
                
                                                    
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                 adau1772
                
                                                    
                 sigma studio 4.7
                
                                                    
                 processors and dsp
                
                                        
                                            
                
                
                                
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                on May 8, 2026 5:24 PM
            
            
						
			            		
    
		
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    Hello Dave,
    

    Thanks for the response, please find the file here, I am using SigmaStudio 4.7 I did not have an external clock, I used what was on the EVAL board.
    

    Currently I'm just testing a simple signal in and signal out, we were expecting the output signal to follow the input signal since in the schematic, we route it that way
    

    Is there always going to be the input frequency - the FS frequency where can I find this information in the datasheet?
    

    Thanks,
    

    Po
    

    

     
    


    TestRevC.zip
    

    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on May 8, 2026 5:24 PM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hello Dave,
    

    Thanks for the response, please find the file here, I am using SigmaStudio 4.7 I did not have an external clock, I used what was on the EVAL board.
    

    Currently I'm just testing a simple signal in and signal out, we were expecting the output signal to follow the input signal since in the schematic, we route it that way
    

    Is there always going to be the input frequency - the FS frequency where can I find this information in the datasheet?
    

    Thanks,
    

    Po
    

    

     
    


    TestRevC.zip
    

    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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