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AD9988 Recommended for New Designs
The AD9988 is a highly integrated device with four 16-bit, 12 GSPS maximum sample rate, RF digital-to-analog converter (DAC) cores, and four 12-bit, 4...
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AD9988 on Analog.com

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AD9988 digital gain range



		

			

									
					    Jeremy.Kuo
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 22, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi, 
    

    As I know, the DAC could be set digital gain control for Main digital data path and channelizer data path and I find the related setting at user guide.
    

    I wonder to know about setting range of digital gain control, it shows the parameter can be set -∞ to 6.018 dB as below figure from user guide, in here I have 12 bits can control the gain and how could I calculate the resolution?
    

    Or the setting range is about  0 to 6.018 dB?
    

     
    

    Thanks.
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Jan 28, 2022 10:57 PM
            
            
					
      
	
      

		
		
      
					
      Hi Jeremy,
      

      The gain is set via the gain code from 0-4095 [decimal] or 000000000000-111111111111 [binary] per channelizer stage using the CHNL-GAIN register. The 6.018 dB maximum translates to a maximum gain of roughly 2 that you can follow the equations you posted. You have 12 bits of resolution from the gain code to set your gain. Hopefully this answers your question, but if not please follow up with more clarity on the resolution you are looking for.
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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