Products Mentioned

AD9910 Recommended for New Designs
The AD9910 is a direct digital synthesizer (DDS) featuring an integrated 14-bit DAC and supporting sample rates up to 1 GSPS. The AD9910 employs an advanced...
Datasheet
AD9910 on Analog.com

Thread Details

  • State Verified Answer
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 48 subscribers
  • Views 1870 views
  • Users 0 members are here
Options
 
Related Content

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
		
	
	
		

	    
	    
	    		
How to create files for RAM?

		
	
				

			

									
					    tumas
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 1, 2011 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user is struggling with creating a suitable set of data for the AD9910 RAM, specifically how to format frequency values. The final answer suggests providing more details on the intended use to better assist. Accompanying answers clarify that the data should be in a 32-bit binary format, with an example of calculating the Frequency Tuning Word (FTW) for a 20 MHz frequency sweep using a 500 MHz SYSCLK.
                        	    
    
                
                     AI Generated Content
                
    	    
    
             
				
        		
    
		    
		    		    
		    			
    
			    
    Hello,
    
 
    having just started using AD9910 board, I got stucked with RAM usage. I know how to load/retrieve data from RAM - the problem is, I do not understand how to create a suitable set of data. Having read the datasheet, technical tutorial, user guide and searched on the Internet, I made only little progress.
    
 
    From the data sheet (p. 33/60, Table 12) I know the required structure of each word and how many bits are assigned to each parameter for each type of entry. However, I have no idea what to put into those bits. The first thing that came to my mind - to load the required values of, for example, frequency - does not seem to be right, especially after having a look at several example files posted on this forum.
    
 
    Therefore I would like to ask you, how can I create files for AD 9910 RAM - what are the general rules, if there is any software required etc.
    
 
    I am especially interested in a way how to get data from Excel/Calc and txt files into a format suitable for the RAM.
    
 
    Thank you very much in advance.
    
			
    
			
									
		                             
                        

    
    
                                            
                 frequency_tuning_word
                
                                                    
                 clock and timing
                
                                                    
                 dds
                
                                                    
                 Direct Digital Synthesis (DDS)
                
                                                    
                 evaluation_board
                
                                        
                                            
                
                
                                        
                                            
                
                
                                
                    Show More
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



Parents
	
      
	

    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
		    
		    		    
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jul 1, 2011 2:58 PM
            
            
						
			            		
      
		
										0
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      I'm not sure I understand what your question.  I think you have all of the information, but maybe just not piecing it together correctly.  I looked up an example RAM file DSB gave in another thread on this forum (https://ez.analog.com/message/11004#11004) and the file is a simple text file with values written in binary.  Each line contains 32-bit word which would be programmed into RAM.
      
 
      For example, the RAM file he gave is a frequency sweep from 20-30 MHz with a SYSCLK of 500MHz.  To calculate the FTW for 20MHz follow the equation given on page 23.  If I do this, I get...
      
 
                FTW = Round[ (20MHz / 500MHz) * 2^32] = 171798692
      
 
                which in binary equals 000001010001111010111000010100011
      
 
                Note: Using the Caclulator on your PC is an easy way to convert from
      
 
                decimal to binary to hex.  Keep in mind though it will not give leading zeros.
      
 
      This is the first line in the example RAM file.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

      • 

	
    



Reply

      


    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
		    
		    		    
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jul 1, 2011 2:58 PM
            
            
						
			            		
      
		
										0
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      I'm not sure I understand what your question.  I think you have all of the information, but maybe just not piecing it together correctly.  I looked up an example RAM file DSB gave in another thread on this forum (https://ez.analog.com/message/11004#11004) and the file is a simple text file with values written in binary.  Each line contains 32-bit word which would be programmed into RAM.
      
 
      For example, the RAM file he gave is a frequency sweep from 20-30 MHz with a SYSCLK of 500MHz.  To calculate the FTW for 20MHz follow the equation given on page 23.  If I do this, I get...
      
 
                FTW = Round[ (20MHz / 500MHz) * 2^32] = 171798692
      
 
                which in binary equals 000001010001111010111000010100011
      
 
                Note: Using the Caclulator on your PC is an easy way to convert from
      
 
                decimal to binary to hex.  Keep in mind though it will not give leading zeros.
      
 
      This is the first line in the example RAM file.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

      • 


    


Children
	
    No Data