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The AD9102 TxDAC and waveform generator is a high performance digital-to-analog converter (DAC) integrating on-chip pattern memory for complex waveform...
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AD9102 on Analog.com

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AD9102 - Differential To Single Ended Voltage

		
	
				

			

									
					    JCole
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 20, 2015 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user encountered signal distortion when using the ADA4817 opamp to convert a 1ms voltage ramp from the AD9102 DAC to a single-ended output without a negative supply. The solution was to either use a negative supply or sum in a DC offset at the amplifier input. The user confirmed that adding a negative supply resolved the issue. Additional questions were raised about the need for a buffer between the DAC and opamp, the nature of the AD9102's differential current outputs, and the interpretation of the output compliance voltage specification.
                        	    
    
                
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    We are attempting to use the following circuit to produce a single ended voltage ramp on the output:
    
 
    
 
    The circuit is based on the circuit used in the AD9102 eval board, except that there is no negative supply (-Vs is tied to ground instead).   
    
 
    The AD9102 is generating a 1ms ramp that looks fine when probed directly at the outputs of the AD9102, but then appears distorted at the output of the ADA4817.  It seems as though the AD4817 is integrating the signal.  This distortion/integration occurs with or without the feedback capacitor C17 installed.  
    
 
    Any suggestions on what might be happening?
    
 
    Thanks
    
 
    JCole
    
			
    
			
									
		                             
                        

    
    
                                            
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