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AD9910's necessary pins to make its external control



		

			

									
					    VinMA
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 22, 2018 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    
 
    I'm a student and I'm working on my first project with a DDS. My project consists in making the communication between the DDS and a MBED controller via SPI. The pins I have been using to try it are:
    
 
    AT THE U5 IO HEADER:
    
 
    -IO_RESET
    
 
    -CSB
    
 
    -SCLK
    
 
    -SDO
    
 
    -SDIO
    
 
    AT THE U6 IO HEADER:
    
 
    -IO_UPDATE
    
 
    AT THE U9 IO HEADER:
    
 
    -EXT_PWR_DWN (grounded)
    
 
    About the IO_UPDATE and the EXT_PWR_DWN I didn't understand their behavior. Can Someone help me?
    
 
     Thanks for the attention,
    
 
    Vinicius
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Feb 25, 2018 7:26 PM
            
            
					
      
	
      

		
		
      
					
      Hi Vinicius,
      
 
      Check out this document for the basic things to be checked when using the DDS evaluation board via external control. As for the IO_UPDATE and EXT_PWR_DWN, the IO_UPDATE transfers programmed data from the buffers to the active registers while a high on EXT_PWR_DWN will initiate the currently programmed power down mode. If unused, it is advisable to connect this pin to ground.
      
 
      Best regards,
      
 
      Mark
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                        
                on Feb 25, 2018 7:26 PM
            
            
					
      
	
      

		
		
      
					
      Hi Vinicius,
      
 
      Check out this document for the basic things to be checked when using the DDS evaluation board via external control. As for the IO_UPDATE and EXT_PWR_DWN, the IO_UPDATE transfers programmed data from the buffers to the active registers while a high on EXT_PWR_DWN will initiate the currently programmed power down mode. If unused, it is advisable to connect this pin to ground.
      
 
      Best regards,
      
 
      Mark
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
				
						
				
				
		
		
      
			
		
      
	
      

      

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