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AD7768-1 Recommended for New Designs
The AD7768-1 is a low power, high performance, Σ-Δ analog-to-digital converter (ADC), with a Σ-Δ modulator and digital filter for precision conversion...
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AD7768-1 on Analog.com

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PGA for AD7768-1

		
	
				

			

									
					    Niels
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 28, 2020 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    Hello,
    

    I have to measure +/-10V single ended signals up to 200kHz with the AD7768-1 (24bit resolution, 512ksps).
    

    Now, my customer asks for a PGA with gain = 1, 2 and 4.
    

    Which signal conditoning solution do you suggest that maintains the noise and distortion levels of the AD7768?
    

    Regards, Niels
    
			
    
			
									
		                             
                        

    
    
                                            
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                on Mar 19, 2020 1:01 PM
            
            
												
						in reply to Wa$iM
					
										
			            		
        
		
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        I have to deal with a single-ended signal, os input common mode voltage is 0V. :-)
        

        Input impedance shall be high to support signal sources with unknown output impedance.
        

        I already ran through this app note quite a while ago, thank you for the reminder, but the question about +/-10V input signals  and high input impedance is left open...
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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