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AD7609 Production
The AD7609 is an 18-bit, 8-channel, true differential, simultaneous sampling analog-to-digital data acquisition system (DAS). The part contains analog...
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AD7609 on Analog.com

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AD7609 Partial Power-Down?

		
	
				

			

									
					    teap
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jun 30, 2021 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user inquires if the AD7609 can handle active analog input voltages (up to ±16V) while powered down. The final answer indicates that the overvoltage protection works in both normal and power-down modes but recommends tying inputs to GND when powered down to avoid potential degradation of Bipolar Zero Code error and THD performance.
                        	    

                
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Hello,


Is the AD7609 designed to withstand active analog input voltages (of up to +/-16V) while the device itself is powered-down?


I'm not sure about the internal clamping circuit. Is this an active circuit that needs a proper power supply to work as intended?


Thank you.

			

			
									
		                             
                        

    

                                            
                 Analog to Digital Converters (ADCs)
                
                                                    
                 Simultaneous Sampling A/D Converters
                
                                                    
                 Precision A/D Converters
                
                                                    
                 ad7609
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			


				
	









	
    
	

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    •  Analog Employees  
    •  Super User  
    
            
						
                            
            
            				
            
                on Jul 1, 2021 12:11 AM
            
            
						
			            		
    
		
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    Hi, 
    

    The protection should work in normal or power-down mode. However, when device is powered-down I think it is recommended to tie both inputs to GND. The overvoltage clamp is use for transient overvoltage condition and not recommended to be active for extended periods in either mode (normal or power-down) as stressing the part outside range may degrade the Bipolar Zero Code error and THD performance as stated in the datasheet. 
    

    Thanks,
    

    Jellenie
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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