Products Mentioned

HMC6832 Last Time Buy
The HMC6832 is an input selectable, 2:8 differential fanout buffer designed for low noise clock distribution. The IN_SEL control pin selects one of the...
Datasheet
HMC6832 on Analog.com

Associated Drivers

ADCLK948 Recommended for New Designs
The ADCLK948 is an ultrafast clock fanout buffer fabricated on the Analog Devices, Inc., proprietary XFCB3 silicon germanium (SiGe) bipolar process. This...
Datasheet
ADCLK948 on Analog.com

Associated Drivers

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HMC6832 output drive level



		

			

									
					    TomH
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 23, 2016 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    The HMC6832 data sheet states that its differential output voltage swing is 721mVpp typ when used in 3V3 LVPECL mode. To check: presumably, this is the swing of each output in the differential pair, so that the full differential output swing is 1.4Vpp into 100Ohms, right? Is that correct? In other words, is the output voltage swing of the HMC6832 similar to other ICs like the ADCLK948?
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Clock Generation and Distribution
                
                                                    
                 Clock Distribution Devices
                
                                                    
                 clock and timing
                
                                                    
                 HMC6832
                
                                                    
                 adclk948
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 29, 2016 2:35 PM
            
            
					
      
	
      

		
		
      
					
      Hi Tom,
      
 
      If I may weigh in here, I think I see where there is confusion. Looking at Table 2 in the HMC6832 datasheet with the Rterm=150 ohms, we see the following:
      
 
      721 mVpp with Voh=2.51 V and Vol=1.79 V. 
      
 
      The Vpp measurement is indeed made with a differential probe, but with the driver static.
      
 
      While toggling, you will see the output driver alternate between +721 and -721 mV.
      
 
      Therefore, you'll have Vpp=1.42V as measured with a differential probe while the driver is toggling, and is as expected for an LVPECL driver.
      
 
      -Paul Kern
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 29, 2016 2:35 PM
            
            
					
      
	
      

		
		
      
					
      Hi Tom,
      
 
      If I may weigh in here, I think I see where there is confusion. Looking at Table 2 in the HMC6832 datasheet with the Rterm=150 ohms, we see the following:
      
 
      721 mVpp with Voh=2.51 V and Vol=1.79 V. 
      
 
      The Vpp measurement is indeed made with a differential probe, but with the driver static.
      
 
      While toggling, you will see the output driver alternate between +721 and -721 mV.
      
 
      Therefore, you'll have Vpp=1.42V as measured with a differential probe while the driver is toggling, and is as expected for an LVPECL driver.
      
 
      -Paul Kern
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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