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EVAL-CN0540. VOCM



		

			

									
					    TSTEngineer
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 16, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  CN0540 
    
    		        		    		    	
			
    I´m working in a PCB design based on EVB CN0540. CN0540 Schematic show two options to obtain VOCM_REF; 1 -  Is using VOCM, 2 - Is using VOCM_ADC. As the schematic shows, in CN0540 EVB is chosen VOCM option by default on the board (selected with a 0R resistor).
    

     
    

    VOCM comes from
    

     
    

    VOCM_ADC Comes from
    

     
    

    I´m trying to simplify my design as much as possible so I would like to know if it would be posible to select only de second option (Obtain VOCM_REF from VOCM_ADC) and not use the first option (Obtain VOCM_REF from VOCM), erasing VOCM section in my design.
    

    I need to know if my proposal would work properly or if there could be any problem with it.
    

    MY PROPOSAL 
    

     
    

    Thank you very much.
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Dec 19, 2022 3:53 PM
            
            
												
						in reply to rogueC
					
									
        
	
        

		
		
        
					
        Thank you very much for your quick answer. Perfect, but could you explain me why is necessary to use the reference buffer for the AD4540? I need to know why, because I have to safe the most space possible into my board design. Also I read in the AD7768 datasheet that RF+ and REF - have interna reference buffers, Could we use these internal  buffers instead of de ADA4807-2 Buffer? If not, please explain me why. Thank You.  
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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