Products Mentioned

ADA4841-1 Production
The ADA4841-1 is a unity gain stable, low noise and distortion, rail-to-rail output amplifier that has a quiescent current of 1.5 mA maximum. In spite...
Datasheet
ADA4841-1 on Analog.com

  • State Verified Answer
  • +1 person also asked this people also asked this
  • Replies 6 replies
  • Subscribers 23 subscribers
  • Views 5156 views
  • Users 0 members are here
Options
Related 

        

            Post
             Go back to editing
        

    

    


    

    









		












	
	
			
	
			
		
	
	
		

		
Re: Driving ADC, please help



		

			

									
					    ADIApproved
					
							

			
				
									
											
			
			
				
  •  Analog Employees  

			
			
			    	
			                    
                
				                on Jul 25, 2024 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hi Ramon,

 
You could use a basic inverting opamp config with the ADA4841-1

 
http://www.analog.com/static/imported-files/tutorials/MT-213.pdf

 
Rin would be twice Rf. You could use 5V and ground as the supplies. However the limitations are you may lose some range near ground and near 5V (maybe 50-100mV depending on head/footroom spec). Also the input impedance is dictated by Rin, so not a high impedance input. Is the positive supply fixed at 12V?

 
Best Rgds,

 
Alan

									
			                
Thread Notes   

        

        
            
		


				
						
        

    
Tags: 
                                            
                 Operational Amplifiers (Op Amps)
                
                                                    
                 amplifiers
                
                                                    
                 Precision Op Amps (Vos ≤1mV & TCVos ≤2uV/C)
                
                                                    
                 ADA4841-1
                
                                
            

    
    

		

			
						
									
									
						
						
			
			
			
			
		


        
        

					

			





















	

	

					



			








	
	
	
	



Parents
	
    
	

  • 
	
    



	
		
	
	



    
	
    
		
    
							
					
    
		
    
			
													0
							
			
				
									
							        
			
			
			
      
            
						
                            
            
            				
            
                on Aug 15, 2013 8:21 PM
            
            
					
      
	
      

		
		
      
					
      You could also leave the power supply on the op-amp at +12, configure the gain to give a 0-10volt output for your given input range and use a 2:1 resistive divider on the output. This also gives a measure of protection to the input stage of the ADC. In order for the resistors to be configured at a low enough value you may need to use a power op amp or a power boost stage. I successfully used this approach in a 20bit audio ADC I designed in the 90's ('Optimising the Performance of 20-bit audio ADC's', preprint 4262 , 100th AES Convention, Copenhagen, 11-14 May 1996)
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

      • 

	
    



Reply

      


    • 
	
      



	
		
	
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
        
            
						
                            
            
            				
            
                on Aug 15, 2013 8:21 PM
            
            
					
        
	
        

		
		
        
					
        You could also leave the power supply on the op-amp at +12, configure the gain to give a 0-10volt output for your given input range and use a 2:1 resistive divider on the output. This also gives a measure of protection to the input stage of the ADC. In order for the resistors to be configured at a low enough value you may need to use a power op amp or a power boost stage. I successfully used this approach in a 20bit audio ADC I designed in the 90's ('Optimising the Performance of 20-bit audio ADC's', preprint 4262 , 100th AES Convention, Copenhagen, 11-14 May 1996)
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

        • 


      


Children
	
      No Data