Products Mentioned

HMC745 Recommended for New Designs
The HMC745 is a XOR/XNOR gate function designed to support data transmission rates of up to 13 Gbps, and clock frequencies as high as 13 GHz. The HMC745...
Datasheet
HMC745 on Analog.com

HMC744 Recommended for New Designs
The HMC744LC3 is a 1:2 Fanout Buffer designed to support data transmission rates up to 14 Gbps, and clock frequencies as high as 14 GHz. All differential...
Datasheet
HMC744 on Analog.com

HMC746 Recommended for New Designs
The HMC746LC3C is an AND/NAND/OR/NOR function designed to support data transmission rates of up to 14 Gbps, and clock frequencies as high as 14 GHz. The...
Datasheet
HMC746 on Analog.com

HMC748 Recommended for New Designs
The HMC748 is a 2:1 Selector designed to support data transmission rates of up to 13 Gbps, and selector port operation of up to 13 GHz. The selector routes...
Datasheet
HMC748 on Analog.com

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VR connection for HMC745

		
	
				

			

									
					    ogura.isao@sankyosha.co.jp
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 26, 2020 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user asked why VR is connected to GND through a 10ohm resistor on the HMC745 evaluation board, unlike HMC744, HMC746, and HMC748 where VR is shorted to VCC. The final answer states that VR consumes about 1mA and has a voltage of -10mV, similar to 0V, with the 10ohm resistor providing protection. Connecting VR to GND in the HMC745 results in no output.
                        	    
    
                
                     AI Generated Content
                
    	    
    
             
				
        		
    
		    
		    		    
		    			
    
			    
    My customer looked into  HMC745 evaluation board and asked me
    

    why does he have to connect VR to GND through 10ohm resistor for HMC745 when shorting with JP1.
    

    In HMC744, HMC746,HMC748 evaluation board, Shorting VR is to VCC with JP1  through 10ohm resistor.
    
			
    
			
									
		                             
                        

    
    
                                            
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