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AD9173 TXEN issue



		

			

									
						Dordije
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Nov 18, 2020 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hi, 


I have encountered an issue while using TXEN0/1 pins on AD9173. The SPI TXEN control is disabled for both DACs, however DAC1 output cannot be enabled using TXEN1 only, but both TXEN0 and 1 have to be set. This does not apply for DAC0.


In other words, DAC0 is normally controlled with TXEN0, while TXEN1 has effect on DAC1 only if TXEN0 is asserted. 


Is this expected behavior? 

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	















	

	

					



			








	
	
	
	



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                                 Analog Employees 
                                
                            
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                on Nov 20, 2020 8:25 PM
            
            
					
    
	
    

		
		
    
					
    Hi Dordije,
    

    Certainly not the intended behavior... but is a known issue on an earlier Silicon revision. The R4a silicon has this resolved: 
    

    AD9171/2/3 were released on R2 silicon
    

    AD9174/5/6 were released on R4a silicon
    

    A later PCN has up-rev'd the AD9171/2/3 to R4a (it is posted on the product page). But while there is still R2 material in distribution (to date), you may receive R2 material still. 
    

    As a workaround, if this TXEN behavior is a concern, please consider using the AD9175 for now. 
    

    Landsman
    

    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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													0
							
			
				
									
							        
            
                                                                                                        
      
                            
    • 
                                 Analog Employees 
                                
                            
      • 
                        
     
                                                           			
			                            
                        
                on Nov 20, 2020 8:25 PM
            
            
					
    
	
    

		
		
    
					
    Hi Dordije,
    

    Certainly not the intended behavior... but is a known issue on an earlier Silicon revision. The R4a silicon has this resolved: 
    

    AD9171/2/3 were released on R2 silicon
    

    AD9174/5/6 were released on R4a silicon
    

    A later PCN has up-rev'd the AD9171/2/3 to R4a (it is posted on the product page). But while there is still R2 material in distribution (to date), you may receive R2 material still. 
    

    As a workaround, if this TXEN behavior is a concern, please consider using the AD9175 for now. 
    

    Landsman
    

    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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