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AD9838 Production
The AD9838 is a low power DDS device capable of producing high performance sine and triangular outputs. It also has an on-board comparator that allows...
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AD9838 on Analog.com

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The value of Vpp of IOUT decreases as the frequency increases.

		
	
				

			

									
					    HL2XGW
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 4, 2024 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user observed that the Vpp of IOUT decreases with increasing frequency in an AD9838 frequency generator circuit, while IOUTB maintains a consistent Vpp. The solution involves using an amplifier at the output of the DDS when driving capacitive loads, such as coaxial cables. The AD9834 LTSpice model can be used to simulate the circuit, as the AD9838 is identical to the AD9834 except for the maximum clock frequency.
                        	    
    
                
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    Category: Hardware
    
    		        		            		    
    Product Number:  AD9838ACPZ, AD9838 
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hello
    

    

    A frequency generator circuit was designed using AD9383.
I tried to use both IOUT and IOUTB, but the Vpp of each waveform is different.
IOUTB maintains Vpp according to the change in frequency, but the Vpp value of the output of IOUT decreases as the frequency increases.
    

    Is there a way to maintain IOUT's Vpp as the frequency increases?

     

    


			

		






    
			
    
			
									
		                             
                        

    
    
                                            
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                 iout
                
                                                    
                 ad9838
                
                                                    
                 IOUTB
                
                                                    
                 clock and timing
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                
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