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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...
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AD9910 on Analog.com

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AD9910 positive chirp with EVB

		
	
				

			

									
					    Kutij
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jun 12, 2018 
				
			
			
		

		
		                     
				
        		

		    
		    		    
		    			

			    
I am using the AD9910 evaluation board. I want to generate a positive frequency chirp of about 10MHz, starting at 150MHz. At the top limit it should fall immedately to lower limit and start again.

 
Questions:

 
1. Loading parameters, which data will make it to run again and again?

 
2. after loading parameters, which control starts the chirp?

 
3. Which control stops the chirp?

 
Thanks.

			

			
									
		                             
                        

    

                                            
                 clock and timing
                
                                                    
                 Clocks & Timers
                
                                                    
                 Direct Digital Synthesis (DDS)
                
                                                    
                 ad9910
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			








	
	
	
	



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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jun 19, 2018 7:27 PM
            
            
						
			            		
    
		
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    Hi,
    
 
    In order to have your desired frequency chirp, the no-dwell high bit should be high.
    
 
    While the no-dwell high bit is set to high, the following are the answers to your questions:
    
 
    1. The DROVER should be passed to DRCTL in order to start the chirp again. Setting up both no-dwell bits (low and high) generates a continuous sweep that is different from the chirp that you want.
    
 
    2. A high on DRCTL starts the chirp.
    
 
    3. A low on DRCTL does not instantly stops the chirp on its current frequency but what it does is that the last chirp will execute up to the top limit and instantly goes to the start frequency and stays there.
    
 
    For more information on chirp, you can check page 31 of the AD9910 data sheet.
    
 
    Best regards,
    
 
    Mark
    
 
    Speak
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jun 19, 2018 7:27 PM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hi,
    
 
    In order to have your desired frequency chirp, the no-dwell high bit should be high.
    
 
    While the no-dwell high bit is set to high, the following are the answers to your questions:
    
 
    1. The DROVER should be passed to DRCTL in order to start the chirp again. Setting up both no-dwell bits (low and high) generates a continuous sweep that is different from the chirp that you want.
    
 
    2. A high on DRCTL starts the chirp.
    
 
    3. A low on DRCTL does not instantly stops the chirp on its current frequency but what it does is that the last chirp will execute up to the top limit and instantly goes to the start frequency and stays there.
    
 
    For more information on chirp, you can check page 31 of the AD9910 data sheet.
    
 
    Best regards,
    
 
    Mark
    
 
    Speak
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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