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HMC649A Recommended for New Designs
The HMC649ALP6E is a 6-bit digital phase shifter which is rated from 3 to 6 GHz, providing 360 degrees of phase coverage, with a LSB of 5.625 degrees....
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HMC649A on Analog.com

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Power-up/Power-down Sequence VSS VDD Vctrl HMC649A Digital Phase Shifter

		
	
				

			

									
					    robertem
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 1, 2022 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user asked about the correct power-up and power-down sequence for the HMC649A Digital Phase Shifter, specifically if the 6-bit V-CTRL can remain on during power-off. The final answer from ADI tech support recommends turning on VDD and VSS simultaneously with control inputs initially at ground or floating, and warns against having digital inputs at logic 1 while VDD and VSS are at 0V.
                        	    
    
                
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    Hi, 
    

    What is the recommended Power-up/Power-down Sequence of VSS, VDD, and 6-bit +ve V-CTRL signals for HMC649A Digital Phase Shifter?
    

    Is the following sequencing correct ?
    

    Power-On: VSS, VDD, and Vctrl 
    

    Power-Off: Vctrl, VDD, and VSS 
    

    Could this device (internal RF Switches or phase shifters) get damaged, if 6-bit V-Ctrl remains ON, while VDD is OFF?   
    

    TIA
    

     
    

    
			
    
			
									
		                             
                        

    
    
                                            
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