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AD7324 Production
The AD7324 is a 4-channel, 12-bit plus sign, successive approximation ADC designed on the iCMOS (industrial CMOS) process. iCMOS is a process combining...
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AD7324 on Analog.com

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A problem about AD7324



		

			

									
					    Huangfeihong
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 11, 2015 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi everyone,
    
 
       I met a quite curious problem recently. I used AD7324 on my board to sample anolog signals, and the power supply are +-15V, +5V and 3.3V. I am seeing the ADC could be locked up sometimes. Everytime the promblem present, the 4 channels of AD7324 output data 0x8 although the channel number changes nomally.This output data would not recover to normal until power down and up again, even i config the command register to work in normal operation every 500us via SPI. I don't know how does this happen, and by the way, the problem would be occur from power up every time.
    
 
      Anyone can tell me why? Thanks a lot!
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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                on Aug 12, 2015 10:57 AM
            
            
					
        
	
        

		
		
        
					
        Hi KarenNE,
        
 
           I havn't fix my problem yet, and i attached my schematic below. I used one ADR443 to generate refference VREF for 3 AD7324. As to the PDF file, ceramic capacitors may be the first factor to "stuck" code, but i put 3 capacitors at the output pin of ADR443, and 2 capacitors at the VREF pin of each AD7324, i think the persability of capacitor could be emililated.The second, the PCB has 6 layers, with 2 whole ground, signals have been burid between the 2 ground layers; The third, ADR443 can output 10mA current max, and the static current of AD7324 is only 1uA, so i think supply currrent of VREF should be enough. Could you help me to check the problem again?
        
 
        Regards,
        
 
        Huang.@
        
 
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													0
							
			
				
									
							        
			
			
			
          
            
			                            
                        
                on Aug 12, 2015 10:57 AM
            
            
					
          
	
          

		
		
          
					
          Hi KarenNE,
          
 
             I havn't fix my problem yet, and i attached my schematic below. I used one ADR443 to generate refference VREF for 3 AD7324. As to the PDF file, ceramic capacitors may be the first factor to "stuck" code, but i put 3 capacitors at the output pin of ADR443, and 2 capacitors at the VREF pin of each AD7324, i think the persability of capacitor could be emililated.The second, the PCB has 6 layers, with 2 whole ground, signals have been burid between the 2 ground layers; The third, ADR443 can output 10mA current max, and the static current of AD7324 is only 1uA, so i think supply currrent of VREF should be enough. Could you help me to check the problem again?
          
 
          Regards,
          
 
          Huang.@
          
 
          @
          
			
          

		
		
		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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