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AD7671 Production
The AD7671 is a 16-bit, 1 MSPS, charge redistribution SAR, analog-to-digital converter that operates from a single 5 V power supply. It contains a high...
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AD7671 on Analog.com

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AD7671 Output has step



		

			

									
					    daydayzhq26
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 13, 2017 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    
 
     When I use AD7671 to convert signal (1Hz to 1kHz), I found steps in the output.
    
 
    Attachment figure 1 is the waveform, where green line is input of AD7671;yellow line is the output of AD7671 (a DCA output, the DAC operated well).
    
									
			        
		
    

							
    
				
				
			
    
					
						
        

    
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                 Single Channel A/D Converters
                
                                                    
                 Precision A/D Converters
                
                                                    
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      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      Hi Henry Zhang,
      
 
        Just some clarification, where is the voltage reference coming from? The reference needs to be very stable. Unstable reference would result in huge error on conversion result. I can see that, you used a opamp to drive the reference, but where did the reference voltage come from? I would recommend using the ADR421 and AD780 as mentioned in the datasheet and it is known to work with AD7671.
      
 
      Regards,
      
 
      Jonathan
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      Hi Henry Zhang,
      
 
        Just some clarification, where is the voltage reference coming from? The reference needs to be very stable. Unstable reference would result in huge error on conversion result. I can see that, you used a opamp to drive the reference, but where did the reference voltage come from? I would recommend using the ADR421 and AD780 as mentioned in the datasheet and it is known to work with AD7671.
      
 
      Regards,
      
 
      Jonathan
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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