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signal attenuation of AD5290



		

			

									
					    kshigemori281
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 10, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		            		    
    Product Number:  AD5290 
    
    		        		    		    	
			
    Hi,
    

    I want to use AD5290. 
    

    Could you confirm following question.
    

    - Could you teach me signal attenuation in dB when used in divider mode with the wiper set to minimum?
      I would like you to provide the typ value and, if possible, the max value. Because I would like to control the audio volume that it needs to be attenuated by -60dB or more. 
      https://www.analog.com/jp/analog-dialogue/articles/digipot-specifications-and-architecture.html
    

    Best Regards
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Nov 10, 2022 9:43 AM
            
            
					
      
	
      

		
		
      
					
      Hi,
      

      

      What do you mean when you say divider mode? Is it in potentiometer mode? Also, what terminal is connected to the supply and the other to ground?
      

      In this configuration:
       
      

      The transfer function is     
        \frac{Rwb}{Rab+Rw}
    
    
    
    

      

      Using 100k Rab, if i'll be considering the max Wiper resistance (100 ohm) and terminal B connected to GND, then the attenuation in dB is -50dB when the wiper is set to minimum.
      

      Using 100k Rab, if i'll be considering the typical Wiper resistance (50 ohm) and terminal B connected to GND, then the attenuation in dB is -56dB when the wiper is set to minimum.
      

      When considering +30% tolerance and 50 ohm resistance, the max attenuation is -58dB.
      

      

      You can use a 1Mohm digipot to reach -60dB and below in this configuration or you can stack digipots, whichever is more suitable for your application. Here's an application note about stacking, cascading or parallel multiple digipots. Pote (analog.com)
      

      n
      

      Best Regards,
      

      Yokki
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Nov 15, 2022 4:42 AM
            
            
												
						in reply to Poylie
					
									
        
	
        

		
		
        
					
        Hi,
        

        Thank you for your support.
        

        >What do you mean when you say divider mode? Is it in potentiometer mode?
        

          - I think potentiometer mode like P16 on datasheet.
        

        

        Thank you for your information about following.
        

        >Using 100k Rab, if i'll be considering the max Wiper resistance (100 ohm) and terminal B connected to GND, then the attenuation in dB is -50dB when the wiper is set to minimum.
        

        >Using 100k Rab, if i'll be considering the typical Wiper resistance (50 ohm) and terminal B connected to GND, then the attenuation in dB is -56dB when the wiper is set to minimum.
        

        >When considering +30% tolerance and 50 ohm resistance, the max attenuation is -58dB.
        

        

        Best Regards
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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