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AD736 Production
The AD736 is a low power, precision, monolithic true rms-to-dc converter. It is laser trimmed to provide a maximum error of ±0.3 mV ± 0.3% of reading...
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AD736 on Analog.com

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AD736 Input Voltage Range

		
	
				

			

									
					    miky
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Oct 28, 2025 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user inquired about the AD736's input voltage range and lack of internal protection diodes. The final answer confirmed that the AD736's input voltage (Vin) should not exceed ±Vs and does not include internal protection diodes. External protection, such as a resistor and diode pair, is recommended during power-up to prevent input voltage from exceeding the supply voltage rails.
                        	    

                
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Category: Datasheet/Specs

    		        		            		    
Product Number:  AD736  

    		        		    		    

		    		    
		    			

			    
Hello.


I have a question about AD736.




Regarding the absolute maximum ratings, the input voltage Vin (Pin 2) is specified as ±Vs. 
Does this IC not incorporate a protection diode?


Is there a reason it doesn't follow the voltage range specifications seen in other ICs, such as -Vs-0.5 to +Vs+0.5V?


During power-up, each pin rises from GND potential. I'm struggling with how to implement input protection relative to Vin.




Best regards.

			

			
									
		                             
                        

    

                                            
                 Datasheet/Specs
                
                                                    
                 Analog Functions
                
                                                    
                 ad736
                
                                                    
                 RMS to DC Converters
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			


				
	









	
    
	

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Oct 29, 2025 10:24 PM
            
            
						
			            		
    
		
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    Hello  

    Thank you for your question regarding the AD736.
    

    The absolute maximum ratings for the input voltage Vin (Pin 2) of the AD736 are specified as ±Vs, which means the input voltage should not exceed the supply voltage levels. Unlike many other ICs that incorporate internal protection diodes, the AD736 does not have such diodes. This is why the input voltage range is specified as ±Vs rather than the more common -Vs-0.5V to +Vs+0.5V range seen in ICs with internal protection diodes.
    

    During power-up, when each pin rises from GND potential, it is crucial to implement external protection measures to ensure the input voltage does not exceed the supply voltage rails. You can use a resistor and diode pair for AC line connection measurements, as shown in the datasheet:
     
    

    For more detailed information, you can refer to the AD736 datasheet: AD736 (Rev. I)
    

    Best regards,
    Paul
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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