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LTC2986 Direct ADC Measurements



		

			

									
						Kazu
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Oct 30, 2018 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hi,


I have a couple of questons about the direct ADC mode of LTC2986. Please take care of this case.


- What is the maximum sampling  speed of internal 24 bit ADCs in the direct ADC mode?


- How can I know conversion start and finish in the direct ADC mode? I can know those by reading any register value?




Regards,


Kazu

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	










	

	

					



			


				
	









	
    
	

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                                 Analog Employees 
                                
                            
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                on Nov 8, 2018 9:55 AM
            
            
					
    
	
    

		
		
    
					
    Hi Kazu, 
    

        The maximum sampling speed of the LTC2986 is fixed for power line rejection. It is about 6Hz when in the default 50/60Hz mode. It will be slightly faster when set for 50Hz rejection only, and slightly slower for 60Hz only. Please see the tables in page 4 of the datasheet as well as page 75 for 2 and 3- cycles modes. Direct ADC is always a 2-cycle mode. 
    

        Conversion start/finish can be monitored by watching the INT signal (pin), as well as watching the Command status register (address 0x000) which will change from 0x80 during a conversion (start bit = 1, done bit = 0) to 0x40 when finished (start bit = 0, done bit = 1). Please see page 17-21 of the LTC2986 DS for more info.
    

    -Logan
    

        
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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