• State Verified Answer
  • Replies 3 replies
  • Subscribers 34 subscribers
  • Views 1862 views
  • Users 0 members are here
Options
Related 

        

            Post
             Go back to editing
        

    

    


    

    









		












	
	
			
	
			
		
	
	
		

		
AD566x/4x/2x(R) -  Supply Voltages & On-chip Reference options



		

			

									
					    Padraic
					
							

			
				
									
											
			
			
				
  •  Analog Employees  

			
			
			    	
			                    
                
				                on Apr 5, 2011 
				
			
			
		


				
		

		    		    
		    
		    	
			
The AD5664R has two on-chip reference options available, 1.25V and 2.5V. What is the recommended supply voltage in each case?

									
			        
		


				
						
        

    
Tags: 
                                            
                 ad5620
                
                                                    
                 Single-Channel Voltage Output D/A Converters
                
                                                    
                 ad5647r
                
                                                    
                 ad5644r
                
                                                    
                 ad5643r
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                
                    Show More
            

    
    

		

			
						
									
									
						
						
			
			
			
			
		


        
        

					

			






	

		
	

















	

	

					



			


				
	









	
    
	

  • 
	
    



	
		
	
	



    
	
    
		
    
							
					
    
		
    
			
													0
							
			
				
									
							        
			
			
			
    •  Analog Employees  
    
            
			                            
                                                                                                                        
            
				
			
            
					
    
	
    

		
		
    
					
    1)The on-chip reference is off on power up so a write is needed to enable the internal reference.
    
 
    2)There are 2 reference options:
    
 
    A) The 1.25V internal reference options have an output voltage range of 0V to 2.5V.
    
 
    B) The 2.5V internal referece options hves an output voltage range of 0V to 5V.
    
 
    Answer:
    
 
    The 1.25V internal reference option will work between a supply of 2.7V to 3.6V
    
 
    The 2.5V intefnal reference option will function between a supply of 4.5V to 5.5V.
    
 
    Note: If the voltage supplied is less than the expected output voltage, the output voltage is clamped by the supply voltage. For example,The expected output when programming full-scale with VDD=5.5V would be ~5V if you are using the 2.5V reference option. If VDD=4.5V,the output is clamped at 4.5V.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

    • 

	

  • 
	
    



	
		
	
	



    
	
    
		
    
							
					
    
		
    
			
													0
							
			
				
									
							        
			
			
			
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      Hi Pradaic,
      
 
      In AD56x4R datasheet (Rev C.), it is said (External Reference chapter, p20) that "All devices (AD56x4R-3 and the AD56x4R-5) can be operated from a single 2.7 V to 5.5 V supply."
      
 
      Above you are stating that "The 1.25V internal reference option will work between a supply of 2.7V to 3.6V".
      
 
      Which is right?
      
 
      Could AD56x4R-3 uses +5V supply?
      
 
      My design uses AD5664R-3 and I connected its supply to +5V.
      
 
      Regards,
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

      • 

	

    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      This question has been closed by the EZ team and is assumed answered.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

      •