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AD8012 Production
The AD8012 is a dual, low power, current feedback amplifier capable of providing 350 MHz bandwidth while using only 1.7 mA per amplifier. It is intended...
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AD8012 on Analog.com

LTspice Production
LTspice® is a powerful, fast, and free SPICE simulator software, schematic capture and waveform viewer with enhancements and models for improving the simulation...
LTspice on Analog.com

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Maximum Single Supply Voltage Range

		
	
				

			

									
					    tsmiley
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jun 6, 2025 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user inquires about using an AD8012 amplifier to drive a 50-ohm coaxial line for a 1PPS GPS signal, aiming for 3V output and <5nS rise/fall times. The support engineer confirms the device can operate with a +7V supply but warns that a 1MΩ feedback resistor will significantly reduce bandwidth. The user clarifies that a high gain of 371 was a mistake and not required for the application.
                        	    

                
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Category: Hardware

    		        		            		    
Product Number:  AD8012 

    		        		    		    

		    		    
		    			

			    
Dear Sir/Madam,


I'm considering using an AD8012 amplifier as a 50-ohm source to drive a 50-ohm coaxial line for a 1PPS GPS signal. The driver will be fed by 3V digital logic. I would like to deliver 3V into the 50-ohm load and achieve rise/fall times of <5nS. My LTSpice simulation tells me that I will require a single supply voltage in excess of 7V. This part is only specified from +/-5V and +5V operation, but its absolute maximum input voltage 12.6V. Can I assume that this device will operate with a +7V supply and is the can the SPICE macro model be trusted under these conditions? Is my approach totally nuts and if so can you suggest a better solution?

 

			

			
									
		                             
                        

    

                                            
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jun 9, 2025 2:29 AM
            
            
						
			            		
    
		
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    Hello  ,
    

    You are correct. This device could work up to 12V single supply as long as input common range of the part is not being violated.
    But looking at your design, since AD8012 is a current feedback amplifier (which highly depend on Rf for bandwidth and stability), putting 1Meg on Rf will kill your bandwidth by huge amount. Does your application really require a gain that high (G=371)?
    Also what is your target bandwidth for your application?

    I've checked the transient response of AD8012 in LT spice and it matches the small and large signal transients so I can say it is reliable atleast in the gain setting stated on the DS. 
    

    Table below shows how bandwidth is decreasing as you increase the gain (without changing the Rf resistor).
    So imagine the drop in bandwidth if you increase your Rf 1000x.
     
    

    Thanks and Best Regards,
    Kenneth
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jun 9, 2025 4:23 PM
            
            
												
						in reply to Kenneth11
					
										
			            		
    
		
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    Hi Kenneth,
    

    Thanks for your response. P.S.: My application does not require a gain=371. The two resistor values were remnants of simulation experiments that I was conducting with a totally different part and I forgot to update them to something more practical.
    

    Todd.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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