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AD9446 Production
The AD9446 is a 16-bit, monolithic, sampling analog-to-digital converter (ADC) with an on-chip track-and-hold circuit. It is optimized for performance...
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AD9446 on Analog.com

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AD9446 Track and Hold operation

		
	
				

			

									
					    JulesMel
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 14, 2025 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user asked about the Track and Hold function of the AD9446 ADC, specifically if the digital output is an integration or mean of the input signal over the 5ns high width of the clock. The final answer clarifies that the AD9446 captures the instantaneous voltage level at the start of the hold phase, not an integration or mean. The user then inquired about a part suitable for integrating current or voltage over 5ns, but no specific product was recommended in the final answer.
                        	    
    
                
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    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  AD9446  
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hello,
    

    I have a question concerning the Track and Hold function of the AD9446. Let assume my clock period is 10ns with 5ns high width. How the digital output given an analog signal is processed, does the output is an integration of the input signal over 5ns ? Or is it a mean of the input signal over 5ns ? Or something else ?
    

    Thank you. 
    
			
    
			
									
		                             
                        

    
    
                                            
                 Datasheet/Specs
                
                                                    
                 High Speed A/D Converters >10 MSPS
                
                                                    
                 ad9446
                
                                                    
                 Standard High Speed A/D Converters
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Aug 15, 2025 1:18 AM
            
            
						
			            		
      
		
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      Hi  
      

      Thanks for your interest in AD9446.
      

      The Track-and-Hold (T/H) function in the AD9446 ADC doesn't perform integration or averaging over the high period of the clock. During the track phase, the ADC follows the input signal. When the hold phase starts (usually at the clock’s rising edge), it captures the signal at that exact moment and converts  this instantaneous voltage level into a digital value.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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