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AD9106 Production
The AD9106 TxDAC® and waveform generator is a high performance, quad digital-to-analog converter (DAC) integrating on-chip pattern memory for complex waveform...
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AD9106 on Analog.com

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AD9106 and white Noise



		

			

									
					    FJahn629
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 29, 2019 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi and good morning together,
    

    we evaluate the AD9106. We have the AD9106-EBZ eval board.
    

    Beside of sine waveform generation, we have to generate noise. We are using  the windows demo software
    

    If I configure to DDS, 100kHz, i get a perfect sine with an amplitude of 1Vss. After i switch to random to get white noise (PRESTORE_SEL1 to 2) i get noise, but only with an amplitude of about 40mVss. How can i get noise with an higher amplitude?
    

    

    Other question:
    

    Is the AD9106 the best choice or would you sugest an other DDS chip for the following customer requirements:
    

    Sine Wave Generation:
    - Range 15kHz to 65kHz
    - Freq resolution: <=1Hz (I think we can archive this with an 16.777216Mhz clock
    - Very low THD: at least <0,1 %
    - Very good SNR: at least 60 dB
    - 2. Second sine wave with the same parameter but with 90° phase shift.

    Noise Generation: 
    - white noise from 15kHz to 65kHz
    

    Regards
    

    Falko  
    

    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 clock and timing
                
                                                    
                 ad9106
                
                                                    
                 Direct Digital Synthesis (DDS)
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Mar 29, 2019 3:09 PM
            
            
					
      
	
      

		
		
      
					
      Hello,
      

      Yes, you can generate the sine waves as you said. You use two channels, set one's phase offset to be 0x0, the other 0x4000 (pi).
      

      The pseudo random sequence is only single bit, and you can't band limit it, so I am not sure it will meet your need. You can double the magnitude by increasing the digital gain from 1 to almost 2 (0x400 to 0x7FF). Alternatively you could generate you own noise and store them in the RAM. Then you can have multi-level and band-limited noise, but be limited to 4k samples.
      

      Regards,
      

      Will
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Mar 29, 2019 3:09 PM
            
            
					
      
	
      

		
		
      
					
      Hello,
      

      Yes, you can generate the sine waves as you said. You use two channels, set one's phase offset to be 0x0, the other 0x4000 (pi).
      

      The pseudo random sequence is only single bit, and you can't band limit it, so I am not sure it will meet your need. You can double the magnitude by increasing the digital gain from 1 to almost 2 (0x400 to 0x7FF). Alternatively you could generate you own noise and store them in the RAM. Then you can have multi-level and band-limited noise, but be limited to 4k samples.
      

      Regards,
      

      Will
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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