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AD5675R internal regulator

		
	
				

			

									
					    rv27
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 19, 2023 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  AD5675R 
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hi,
    

    I am trying to understand the output of this DAC when the output buffers are in gain 2.
    

    As the Vref is 2.5V this would give 2xVref on the output which is 5V. Is this 5V generated internally?
    

    If i power the part from VDD of 3.3V the output will still be 0->5V and not 0->Vdd(+3.3V)?
    

    Thanks
    
			
    
			
									
		                             
                        

    
    
                                            
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 19, 2023 9:47 PM
            
            
						
			            		
      
		
										+1
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hi  ,
      

      Is the 5V output generated internally? Yes, the output is generated internally.
      

      Will the output still be 0->5V and not 0->Vdd(+3.3V) if the part is powered from a VDD of 3.3V? No, the output will be clipped to 3.3V, as the datasheet states: "The output buffer amplifier generates rail-to-rail voltages on its output, which gives an output range of 0 V to VDD."  However, the resolution of the DAC will remain the same, even though the output voltage is clipped.
      

      Best Regards,
      

      Den
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 19, 2023 9:47 PM
            
            
						
			            		
      
		
										+1
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hi  ,
      

      Is the 5V output generated internally? Yes, the output is generated internally.
      

      Will the output still be 0->5V and not 0->Vdd(+3.3V) if the part is powered from a VDD of 3.3V? No, the output will be clipped to 3.3V, as the datasheet states: "The output buffer amplifier generates rail-to-rail voltages on its output, which gives an output range of 0 V to VDD."  However, the resolution of the DAC will remain the same, even though the output voltage is clipped.
      

      Best Regards,
      

      Den
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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