Products Mentioned

AD7641 Production
The AD7641 is a 18-bit, 2 MSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates from a single 2.5 V power supply...
Datasheet
AD7641 on Analog.com

AD8180 Production
The AD8180 (single) and AD8182 (dual) are high speed 2-to-1 multiplexers. They offer -3 dB signal bandwidth greater than 780 MHz along with slew rate of...
Datasheet
AD8180 on Analog.com

MAX393 Production
The MAX391/MAX392/MAX393 are precision, quad, single-pole/single-throw (SPST) analog switches designed to operate at +3V, +5V, or ±5V. The MAX391 has four...
Datasheet
MAX393 on Analog.com

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Multiplexer for AD7641

		
	
				

			

									
					    bleudoutremer
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 1, 2021 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    Hello!
    

    I'd like to use a MUX to extend the number of inputs for AD7641. I'm considering AD8180 and MAX393.
    

    Do you think adding one of these will reduce the effective ADC resolution?
    

    Are there other downsides? What should I look for when choosing a MUX? I think AD8180 is really fast and pretty low noise but offset and drift are higher then the amplifier I plan to use as ADC driver (AD8139).
    

    

    Best regards,
    

    Vitor.
    
			
    
			
									
		                             
                        

    
    
                                            
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Apr 1, 2021 4:51 PM
            
            
						
			            		
      
		
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      Hello Vitor,
      

       
      

      To avoid significant reduction in ADC performance, the components used in your ADC front end (the multiplexer, ADC driver amplifier and RC kickback) must be selected to ensure that your input signal is properly settled. I am not sure of the specifics about your application, but at a minimum, each component in the ADC front end must have enough bandwidth and sufficient settling time to properly settle your inputs as well as meet the noise and other performance requirements for your application. For a more comprehensive overview regarding the design considerations and challenges of designing a multiplexed data acquisition system, I would recommend that your read this article: https://www.analog.com/en/analog-dialogue/articles/demystifying-data-acquisition-systems.html
      

      

      I am not sure what glitch specification you are referring to. If this is a question regarding the multiplexer data sheet, you will need to submit a question in the Switches/Multiplexer forum. 
      

       
      

      Best,
      

      Kiriaki
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Apr 1, 2021 4:51 PM
            
            
						
			            		
      
		
										0
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hello Vitor,
      

       
      

      To avoid significant reduction in ADC performance, the components used in your ADC front end (the multiplexer, ADC driver amplifier and RC kickback) must be selected to ensure that your input signal is properly settled. I am not sure of the specifics about your application, but at a minimum, each component in the ADC front end must have enough bandwidth and sufficient settling time to properly settle your inputs as well as meet the noise and other performance requirements for your application. For a more comprehensive overview regarding the design considerations and challenges of designing a multiplexed data acquisition system, I would recommend that your read this article: https://www.analog.com/en/analog-dialogue/articles/demystifying-data-acquisition-systems.html
      

      

      I am not sure what glitch specification you are referring to. If this is a question regarding the multiplexer data sheet, you will need to submit a question in the Switches/Multiplexer forum. 
      

       
      

      Best,
      

      Kiriaki
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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