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AD4020 operation with single ended input gives non-zero reading even when inputs are not present ?



		

			

									
					    Bivin
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 23, 2018 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I'm using AD4020 for DC input measurement by implementing Figure 36 of AD4020 datasheet. Implemented schematic is below
    

     
    

    

    But i'm getting non-zero readings which gives 0.25V reading by considering only MSB 15 bits and converting same to voltage by multiplying reading with 7.63uV. ie i'm getting readings like "7FB8x" as MSB. W.r.t to the schematic shared, what could be the problem, does this IC have some offset ? Please confirm single-ended DC input support for this part.