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AD7680 Production
The AD7680 is a 16-bit, fast, low power, successive approximation ADC. The part operates from a single 2.5 V to 5.5 V power supply and features throughput...
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AD7680 on Analog.com

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Problem Acquire 0-5V signal with AD7680



		

			

									
					    electronic974
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 17, 2012 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    
 
    I use an ad7680 to measure 0-5V DC signal.This ADC is interfacing with PIC32MX795F512L, with SPI interface.
    
 
    The supply of the ADC is 5V.
    
 
    I have a problem with this ADC, when my analog signal increase 0 to 2.5 V the digital output increase 0 to 65535.
    
 
    After when my signal increase from 2.5V to 5V the digital output increase 0 to 65535.
    
 
    Normally , i think that the digital output should increase from 0 to 65535 when the anlog input increase 0 to 5V.
    
 
    Is anyone have this problem ? Can you help me.
    
 
    Excuse me for my bad english.
    
 
    Best regards.