Products In This Thread

AD7323 Production
The AD7323 is a 4-channel, 12-bit plus sign successive approximation analog-to-digital converter (ADC) designed on the iCMOS™ (industrial CMOS) process...
Datasheet
AD7323 on Analog.com

  • State Verified Answer
  • Replies 1 reply
  • Subscribers 69 subscribers
  • Views 1595 views
  • Users 0 members are here
Options
Related 

        

            Post
             Go back to editing
        

    

    


    

    









		












	
	
			
	
			
			
	
	
		

		
AD7323 Decoupling



		

			

									
					    cwhiteman
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 10, 2014 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello All,
    
 
    In the data sheet for the AD7323 it states: "Good decoupling is also important. All analog supplies should be decoupled with 10 μF tantalum capacitors in parallel with 0.1 μF capacitors to AGND....These low ESR, low ESI capacitors provide a low impedance path to ground at high frequencies to handle transient currents due to internal logic switching."
    
 
    I read on another site (Choosing between ceramic and tantalum capacitors - 31 October 2007 - Avnet Kopp - Dataweek and the section I am referring to is a few paragraphs into 'Advantages of MLCCs' though it specifically states PSU's) that I can replace this technique of a tantalum capacitor in parallel with another smaller capacitor if I use a multilayer ceramic.
    
 
    Which of these techniques ould be considered 'best practice' or recommended for this component?  Are either (or both) of these techniques antiquated?
    
 
     
    
 
    Attached is the datasheet for the AD7323.
    
 
    Thanks, Cam
    
								
    

				
							AD7323.pdf
					
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



Parents
	
      
	

    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                        
                on Jun 10, 2014 11:57 PM
            
            
					
      
	
      

		
		
      
					
      Hi Cam,
      
 
           Thank you for your question. This looks interesting topic. Capacitors are one of the common components used in the circuit designs. While there are types of capacitor exist nowadays like as what you have mentione the MLCC and tantalum.
      
 
           Most of the electronic device today uses the MLCC because of its advantages one of it is small and low ESR and ESL and many others as mentioned from the aticle from your post. The recommended 10uf tantalum capacitor and 0.1uf ceramic on the AD7323 since this combination was proven to have a good result. 
           Each capacitor technology has its advantage and disadvantage. To answer your inquiry of what would be the best , I think that it need to consider what application the circuit will be use.
      
 
           Here is an article that summarizes the capacitor technology, its pros and cons. This can be your reference or may help you decide what type of capacitor technology be use for your application.
      
 
      http://www.analog.com/static/imported-files/application_notes/AN-1099.pdf
      
 
      Regards,
      
 
      Jonathan
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

      • 

	
    



Reply

      


    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                        
                on Jun 10, 2014 11:57 PM
            
            
					
      
	
      

		
		
      
					
      Hi Cam,
      
 
           Thank you for your question. This looks interesting topic. Capacitors are one of the common components used in the circuit designs. While there are types of capacitor exist nowadays like as what you have mentione the MLCC and tantalum.
      
 
           Most of the electronic device today uses the MLCC because of its advantages one of it is small and low ESR and ESL and many others as mentioned from the aticle from your post. The recommended 10uf tantalum capacitor and 0.1uf ceramic on the AD7323 since this combination was proven to have a good result. 
           Each capacitor technology has its advantage and disadvantage. To answer your inquiry of what would be the best , I think that it need to consider what application the circuit will be use.
      
 
           Here is an article that summarizes the capacitor technology, its pros and cons. This can be your reference or may help you decide what type of capacitor technology be use for your application.
      
 
      http://www.analog.com/static/imported-files/application_notes/AN-1099.pdf
      
 
      Regards,
      
 
      Jonathan
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

      • 


    


Children
	
    No Data