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Single Enned input in HMC745



		

			

									
						DAYTRIPPER
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on May 14, 2018 
				
			
			
		


				
		

		    		    
		    
		    	
			
Dear Sir!

 
I want to use HMC745LC3 (14 Gbps, XOR / XNOR gate).

 
I just want to use this high speed gate for XOR operation.

 
In my application, both input data sources, A and B, are single-ended within 6~8Gbps range.

 
Though some basic questions, but i need your kind guidance for:

 

1) For single ended operation, should i connect differential inputs (AN, BN) and output (DN) to GND, or leave it floating?

 
 >  i founded the your last answer,

 
     you sad, when using hmc745 in single ended operation, you should connect a 50ohms to unused pins.

 
     is it done? how about connected the DC Block cap by reduce the Jitter?

 

  case1) only 50Ω serial Connected. (50Ω-GND)

 
  case2) Cap - 50Ω - GND

 
 

 
plz explain the circuit scemetic.

 
Kind Regards,

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	











	

	

					



			


				
	









	
    
	

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                                 Analog Employees 
                                
                            
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                on May 14, 2018 12:35 PM
            
            
					
    
	
    

		
		
    
					
    Hi,
    
 
    The part works between Vcc and GND, where inputs and outputs have termination to Vcc. Thus, you should terminate unused pins to Vcc with 50ohms. If your interfacing part's DC levels match with HMC745, you dont need to use dc block caps both for used and unused pins. If your interfacing part's DC levels do not match, I would recommend you to use dc block caps for both used and unused pins, where unused pin terminations can be connected to GND.
    
 
    Best regards
    
 
    Sinan 
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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