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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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Digital Gain in AD9106 does not seem to have an effect. 



		

			

									
					    gtsasha
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 8, 2017 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello!
    
 
    I am  trying to generate constant output from AD9106 DAC2 and it looks like setting digital gain and DC offset does not have an effect.  
    
 
    I have the following configuration:
    
 
    WAV2_1CONFIG (0x27) is set to 0x0101 to select prestored wavefor constant value
    
 
    DAC2_CST (0x30) is 0x4000
    
 
    No matter what I set DAC2_DGAIN (0x34) and DAC2DOF (0x24) to there is no effect on the output.  Changing DAC2_CONST (0x30) does change output.
    
 
    What could be the issue?
    
 
    I saw this errata:  AD9106 Errata  but it did not help.  
    
 
    Also, how does AD9106 handle overflow?  What if I DAC2_CONST is set to 3000 (0xbb8) and DAC2_DGAIN to 2.0?  6000 is not representable in 12 bits so what will happen?  Will the signal saturate to 0x0fff (4095) or roll to 0x770 (1904)?  The spec sheet is not clear.  Same for adding DC offset.  
    
 
    Thank you very much!