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Configuring AD5422 Midscale Voltage output



		

			

									
					    KS_badanaje
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 11, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi Team,
    

    

    I am able to get 0-5V output range with AD5422 DAC, but I want to set the output range in the Midscale range (between 0.5-5V).
    

    I tried to configure CLEAR SELECT and CLEAR bit in the AD5422 Control register but the lowest output value is always 0V instead of 0.5V .
    

    Please suggest to me how to configure the same for 0.5V output?
    

    

    Best Regards,
    

    Keshava Shreenidhi
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 ad5422
                
                                                    
                 voltage-output-dac
                
                                                    
                 4-20mA Current Loop D/A Converters
                
                                                    
                 Precision D/A Converters
                
                                                    
                 control registers
                
                                        
                                            
                
                
                                
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Apr 12, 2022 9:41 PM
            
            
					
      
	
      

		
		
      
					
      Hi Keshava, 
      

      The values issued for the clear function are fixed as shown in table 22 on the datasheet. For unipolar configuration, such as in your case, it can just either be 0V or midscale (2.5V). 
      

      What is your application here? Why do you need to have the clear voltage set to 0.5V? Is it not possible to just use a data write to the device to set it to 0.5V?
      

      ~Ian
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Apr 18, 2022 10:30 AM
            
            
												
						in reply to EZAutoReply
					
									
        
	
        

		
		
        
					
        Hi Ian,
        

        Thanks for your reply.
        

        

        No, I don't want to set the clear voltage as 0.5V.
        

        Our requirement is: for digital input values in the range 0000 to FFFF we should get the DAC output in the range
        

        (1) 0.5V to 5V. 
        

        (2) 0.25V to 7V
        

        (3) 1.3V to 6.3V
        

        So I thought by configuring CLEAR and CLEAR_SEL I might get the DAC output in those ranges.
        

        Is there any way I can get these outputs? 
        

        

        Thank you,
        

        Keshava Shreenidhi
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
						
                            
            
            				
            
                on Apr 18, 2022 10:30 AM
            
            
												
						in reply to EZAutoReply
					
									
          
	
          

		
		
          
					
          Hi Ian,
          

          Thanks for your reply.
          

          

          No, I don't want to set the clear voltage as 0.5V.
          

          Our requirement is: for digital input values in the range 0000 to FFFF we should get the DAC output in the range
          

          (1) 0.5V to 5V. 
          

          (2) 0.25V to 7V
          

          (3) 1.3V to 6.3V
          

          So I thought by configuring CLEAR and CLEAR_SEL I might get the DAC output in those ranges.
          

          Is there any way I can get these outputs? 
          

          

          Thank you,
          

          Keshava Shreenidhi
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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