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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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      •  Analog Employees  
      
            
			                            
                        
                on Feb 7, 2018 4:34 AM
            
            
					
      
	
      

		
		
      
					
      Hi Henry,
      
 
         I have checked the specs for the recommended ADR421 and compare with ADR01 in terms of the current drive capability and they are not very far. As you suggested about the driver. The AD8031 settling time is 125ns (at 0.1%) against the AD797 800ns at 0.0015%. This means that the AD8031 can settle faster but although the AD797 is slower but has higher accuracy when it settle. Using the AD8031 as driver, as recommended since this was proven to work with AD7671.
      
 
      Regards,
      
 
      Jonathan
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                        
                on Feb 7, 2018 4:34 AM
            
            
					
      
	
      

		
		
      
					
      Hi Henry,
      
 
         I have checked the specs for the recommended ADR421 and compare with ADR01 in terms of the current drive capability and they are not very far. As you suggested about the driver. The AD8031 settling time is 125ns (at 0.1%) against the AD797 800ns at 0.0015%. This means that the AD8031 can settle faster but although the AD797 is slower but has higher accuracy when it settle. Using the AD8031 as driver, as recommended since this was proven to work with AD7671.
      
 
      Regards,
      
 
      Jonathan
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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