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AD9281 Production
The AD9281 is a complete dual channel, 28 MSPS, 8-bit CMOS ADC. The AD9281 is optimized specifically for applications where close matching between two...
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AD9281 on Analog.com

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AD9281 problem



		

			

									
					    nigelwright7557
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 20, 2019 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I have a circuit that uses an AD9281
    

    If I connect VREF/2 to both inputs I should get code 128 out.
    

    For channel 1 I am getting 128 + 16 and for channel 2 I am getting 128 + 32
    

    VREFB is 1 volt and VREFT is 2.5 volts
    

    I suspect something wrong wit VREFT as I think it should be 2 volts not 2.5 volts.
    

    Any advice would be appreciated.
    

    VREF is 2 volt exactly.