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HMC745 question



		

			

									
						ryan-tsai
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Jun 5, 2018 
				
			
			
		


				
		

		    		    
		    
		    	
			
Dear Sir,

 
I have below questions for HMC745 need your help.

 
a. How much time for maximum propagation delay while input clock between 1~2GHz?

 

 
b. For out voltage swing , if customer set to 600mVp-p that means 0~600mVp-p or +/-300mV?

 
    and if customer hope to Vcom= 0.9V ( output swing 0.6V~1.2V) and how to do it ?

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	











	

	

					



			


				
	









	
    
	

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                                 Analog Employees 
                                
                            
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                on Jun 7, 2018 12:58 PM
            
            
					
    
	
    

		
		
    
					
    Hi,
    
 
    a. Propagation delay is almost constant for different clock frequencies.
    
 
    b. In the datasheet, the specified output swing is differential peak to peak. This means each if the part is set to 600mV, each output will have 300mVpp swing.
    
 
    If the customer wants to have common mode shifted to 900mV, than the supplies of the part should be shifted. Normally, common mode of HMC745 is around 3.1V. The part's supply can be shifted to 1.1V ~ -2.2V. 
    
 
    What is the interfacing part and its pull up resistor reference?
    
 
    Sinan
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jun 11, 2018 5:55 AM
            
            
					
    
	
    

		
		
    
					
    Hi Salemdar,
    
 
    Thanks for your feedback.
    
 
    a. Propagation delay is almost constant for different clock frequencies.
    
 
    -->Yes , we know it , so what is the propagation delay while clock at 1~2GHz.
    
 
         Could you provide the data of it?
    
 
    b
    
 
    b. In the datasheet, the specified output swing is differential peak to peak. This means each if the part is set to 600mV, each output will have 300mVpp swing.
    
 
    If the customer wants to have common mode shifted to 900mV, than the supplies of the part should be shifted. Normally, common mode of HMC745 is around 3.1V. The part's supply can be shifted to 1.1V ~ -2.2V. 
    
 
     -->This is useful to us for **** power supply to 1.1V~-.2.V ,tks!
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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