Products Mentioned

ADN2917 Not Recommended for New Designs
The ADN2917 provides the receiver functions of quantization, signal level detect, and clock and data recovery for continuous data rates from 8.5 Gbps to...
Datasheet
ADN2917 on Analog.com

HMC726 Recommended for New Designs
The HMC726 is an AND/NAND/OR/NOR function designed to support data transmission rates of up to 13 Gbps, and clock frequencies as high as 13 GHz. The HMC726...
Datasheet
HMC726 on Analog.com

HMC856 Recommended for New Designs
The HMC856 is a wideband time delay device with a 5-bit digital control designed for timing compensation or clock skew management applications. The time...
Datasheet
HMC856 on Analog.com

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Differential input accepting single ended signal

		            
		

			

									
					    ahtran
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 28, 2021 
				
			
			
		
    
		
     
				
		
    
		    		    
		    
		    	
			
    I am using the ADN2917 differential output as single ended inputs into the HMC856 and HMC726.  The system is communicating at 10Gbps.  I don't have the option of using a clock buffer.  Can the circuit be connect like below?  
    

     
    
										

    
				Adding note about the clock buffer
    
[edited by: ahtran at 7:30 PM (GMT -4) on 28 Apr 2021]
				
    
						
			        
		
    

				
						
        

    
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                 adn2917
                
                                                    
                 Logic Gates
                
                                                    
                 Clock Generation and Distribution
                
                                                    
                 Clock and Data Recovery/Retiming
                
                                                    
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Apr 29, 2021 2:25 AM
            
                                    
					
      
	
      

		
		
      
					
      Hi Ahtran,
      

      Differential ADN2917 output specs are different from single ended HMC856 and HMC726 devices. You will need to review the VIH/VIL specs for chip being driven by the ADN2917 in differential mode wrt single-ended spec from HM856 and HMC716. We can connect to one single ended device at a time but it violates the spec when we connect to two single ended devices. In general AIN+ can be used for single ended operation, check the HMC726 datasheet for the connectivity.
      

      Thanks,
      

      Siva Kumar.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
				
				
				
		
		
      
			
		
      
	
      

      

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                on Apr 30, 2021 11:23 AM
            
                                    
												
						in reply to ADIApproved
					
									
        
	
        

		
		
        
					
        Hi Siva,
        

        I have another question.  If I want to connect the output of ADN2917 to the input of HCM856, can I use DC couple connection as shown below?  The ADN2917 is using a positive voltage rail, but the HMC856 is using a negative voltage rail, so I am not sure if DC couple is possible.
        

         
        

        If AC couple is required, do I need to add 50 ohm pull-up to VCC on the ADN2917 side?
        

        Thanks
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
				
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        
            
						
                            
            
            				
            
                on May 3, 2021 1:13 AM
            
                                    
												
						in reply to ahtran
					
									
        
	
        

		
		
        
					
        Hi Ahtran,
        

        Yes, you are right. DC coupling connectivity is not possible at the output section in this scenario and external pull-up required at output circuitry. AC coupling capacitors and pull-up resistors are must to be chosen such that the device should work properly without effecting the full data rates. Please refer to the applications information section in ADN2917 data sheet for choosing AC Coupling Capacitors.
        

        Regards,
        

        Siva Kumar.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
						
				
				
				
		
		
        
			
		
        
	
        

        

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													+1
							
			
				
									
							        
			
			
			
        •  Analog Employees  
        
            
						
                            
            
            				
            
                on May 3, 2021 1:13 AM
            
                                    
												
						in reply to ahtran
					
									
        
	
        

		
		
        
					
        Hi Ahtran,
        

        Yes, you are right. DC coupling connectivity is not possible at the output section in this scenario and external pull-up required at output circuitry. AC coupling capacitors and pull-up resistors are must to be chosen such that the device should work properly without effecting the full data rates. Please refer to the applications information section in ADN2917 data sheet for choosing AC Coupling Capacitors.
        

        Regards,
        

        Siva Kumar.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
						
				
				
				
		
		
        
			
		
        
	
        

        

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