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AD5429: DAC does not start up correctly sometimes



		

			

									
						Ant2018
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Aug 2, 2018 
				
			
			
		


				
		

		    		    
		    
		    	
			
I have a problem that AD5429 can not start up correctly. The start up fails once or twice every 10 times power up.

 
In that case, DAC output does not change even tough applying any command and power up command. Does not respond to program (Clear DAC output to zero scale - 0xBXXX) and hardware reset (~CLR pin to 0). DAC use both channels: 1) as a programmble gain element; 2) standart unipolar mode. If DAC start correctly, work both channels, reset and correctly responds to commands from the microprocessor. Please refer to the attached my schematic and let me know if there are anything that need an improvement.

								


							

				
				
			

					
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	











	

	

					



			








	
	
	
	



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                                 Analog Employees 
                                
                            
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                on Aug 3, 2018 11:12 AM
            
            
					
    
	
    

		
		
    
					
    Hi ,
    
 
    Few questions:
    
 
    1) Can you please specify the power sequence used during power up? (VDD, VREFB, RFBA)
    
 
    2) When the device does not start up properly, what are the outputs of the two DACs? are they are zero scale?
    
 
    3) What is the range of Vin applied to RFBA?
    
 
    4) Have you tried testing if not applying Vin and disabling will result to consistent and successful power up?
    
 
    5) When the device does not start up properly, have you tried checking if readback function works? Just want to make sure that the communication block works.
    
 
    Cheers,
    
 
    Ivan
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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													0
							
			
				
									
							        
            
                                                                                    
      
                            
    • 
                                 Analog Employees 
                                
                            
      • 
                        
     
                                                            			
			                            
                        
                on Aug 3, 2018 11:12 AM
            
            
					
    
	
    

		
		
    
					
    Hi ,
    
 
    Few questions:
    
 
    1) Can you please specify the power sequence used during power up? (VDD, VREFB, RFBA)
    
 
    2) When the device does not start up properly, what are the outputs of the two DACs? are they are zero scale?
    
 
    3) What is the range of Vin applied to RFBA?
    
 
    4) Have you tried testing if not applying Vin and disabling will result to consistent and successful power up?
    
 
    5) When the device does not start up properly, have you tried checking if readback function works? Just want to make sure that the communication block works.
    
 
    Cheers,
    
 
    Ivan
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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