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Why use another FDA (ADA4954-1) in CN0535 as LTC6373 has capability to drive ADC  too?



		

			

									
					    diverger
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 14, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  LTC6373, ADA4954-1, AD7768-1 
    
    		        		    		    	
			
    Hi,
    

    In the reference design CN0535, between the LTC6373 and AD7768-1, there is another FDA. As PGIA 6373 has differential output too, why use the ADA4954-1 here? Only for the AAF?
    

    

    Thanks.
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                        
                on Nov 18, 2022 8:20 AM
            
            
					
      
	
      

		
		
      
					
      Hello,
      

      I have discussed this with one of the hardware designers of this reference design. You are right that it is possible for the LTC6373 to directly drive the AD7768-1 input however, this was not evaluated in the design. The ADA4954-1 was primarily designed for AAF to attenuate frequencies around the sample rate.
      

      Best Regards,
      

      Nikko
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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