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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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													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Dec 14, 2017 3:58 PM
            
            
					
        
	
        

		
		
        
					
        Hi Jonathan,
        
 
        AD7671 has 64kHz sample rate (see Figure 4). It operates with a MCU (see figure 3). The DAC sample rate is 64kHz as well.
        
 
        The schematic is in Figure 1,2. The MCU just receive data from AD7671 and send the row data to DAC. The data has no process.
        
 
        The height and period of these steps is in Figure 5.
        
 
        Figure 6 is the overview of AD7671 input (green line) and DAC output (yellow line).
        
 
        Figure1
        
 
        Figure 2
        
 
        Figure 3
        
 
        Figure4 
        
 
        Figure 5
        
 
        Figure 6
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
			                            
                        
                on Dec 14, 2017 3:58 PM
            
            
					
          
	
          

		
		
          
					
          Hi Jonathan,
          
 
          AD7671 has 64kHz sample rate (see Figure 4). It operates with a MCU (see figure 3). The DAC sample rate is 64kHz as well.
          
 
          The schematic is in Figure 1,2. The MCU just receive data from AD7671 and send the row data to DAC. The data has no process.
          
 
          The height and period of these steps is in Figure 5.
          
 
          Figure 6 is the overview of AD7671 input (green line) and DAC output (yellow line).
          
 
          Figure1
          
 
          Figure 2
          
 
          Figure 3
          
 
          Figure4 
          
 
          Figure 5
          
 
          Figure 6
          
			
          

		
		
		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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