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ADG467 Bandwidth



		

			

									
					    teap
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 3, 2019 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    

    I'm wondering about the ADG467 -3dB bandwidth. There is a Insertion Loss graph in the datasheet with a flat region at lower frequencies alright. 
    But the flat value indicates -3dB! Does this really mean that even at low frequencies only 70% of the input signal will pass through with the ADG467?
    

    Thanks for any light on this.
    

    

    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Jul 4, 2019 8:46 AM
            
            
					
      
	
      

		
		
      
					
      Hi Teap,
      

       
      

      You are correct. The ADG467 is an octal channel protector, and its frequency response plot, in the datasheet, shows that from 120 kHz to 10 MHz the insertion loss is approximately -3 dB. This is due to the voltage drop across the on-resistance of the switch.
      

      As an alternative, you could use the ADG5462F (quad channel protector), which has a much lower on-resistance, thus the insertion loss is higher than -1 dB up to 20 MHz. If fact, the ADG5462F has a -3 dB bandwidth of 318 MHz.
      

      Also, this part has an improved fault protection feature that can withstand higher voltages than the ADG467 and it has an interrupt flag that indicates the fault status.
      

       
      

      Yours sincerely,
      

      Igor Ono.
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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