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AD9862 Not Recommended for New Designs
The AD9860 / AD9862 are versatile integrated mixed signal front ends that are optimized for broadband wireless applications. The AD9860 / AD9862 are cost...
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AD9862 on Analog.com

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What's the frequency of carrier frequency provided by AD9862 for digital up conversion?

		
	
				

			

									
					    lemetise
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 2, 2012 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    Hello,
    
 
        I'm a student,our lab is studying USRP recently.I know AD9862 in USRP have the function of digital up conversion.Would you tell me how big the carrier frequency is?Is it a constant or range?I havn't found the answer in AD9862's datasheet.
    
 
       Thank you!    
    
			
    
			
									
		                             
                        

    
    
                                            
                 ad9862
                
                                                    
                 High Speed A/D Converters >10 MSPS
                
                                                    
                 Mixed-Signal Front Ends (MxFE)
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jul 2, 2012 4:14 AM
            
            
						
			            		
      
		
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      Hi,
      
 
      This has been moved from the Hardware Tools community to the High-Speed DACs community. Please continue the discussion here.
      
 
      Thanks,
      
 
      Colin.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jul 2, 2012 2:03 PM
            
            
						
			            		
      
		
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      The AD9862 digital data path supports complex or real modulation which is what the data sheet means by digital up convertion. The details of the modulation is described on pages 19 and 20 of the data sheet. There is coarse modulation that will mix the signal upto 1/8 or 1/4 FDAC where FDac is the DAC sample rate frequency. There is also a 24 bit NCO that offers fine resolution of the modulation up to 1/4 FDAC, which has to be used with the 4x interpolation mode. Since the DACs max sample rate is 128MSPS the maximum frequency you can mix up to is 32MHz. With the NCO the mixing frequency can be DC to 32MHz. The desired frequency is set with the regsiters that set frequency tunning word of the NCO.
      
 
                     Best Regards
      
 
                     Tom
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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