Products Mentioned

AD8139 Recommended for New Designs
The AD8139 is an ultralow noise, high performance differential amplifier with rail-to-rail output. With its low noise, high SFDR, and wide bandwidth, it...
Datasheet
AD8139 on Analog.com

AD8138 Production
The AD8138 is a major advancement over op amps for differential signal processing. The AD8138 can be used as a single-ended-to-differential amplifier or...
Datasheet
AD8138 on Analog.com

  • State Verified Answer
  • Replies 8 replies
  • Subscribers 20 subscribers
  • Views 2343 views
  • Users 0 members are here
Options
Related 

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
			
	
	
		

		
AD8139 Not Working. I need help



		

			

									
					    sschekall
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 23, 2011 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I am using the AD8139 in the as shown in the attached PDF.
    
 
    Spice simulations work fine. But On the bench using +-5V supplys,  AD8138 outputs Nothing.
    
 
    What did I do wrong.
    
 
    Stan Schekall a783239d66076ba983835f6e0157fe05.pdf
    
									
			        
		
    

				
							osc_5MHZ.pdf
							
        

    
    Tags: 
                                            
                 amplifiers
                
                                                    
                 Differential Amplifiers and ADC Drivers
                
                                                    
                 ad8139
                
                                                    
                 ad8138
                
                                                    
                 Single-Ended to Differential Amplifiers
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



Parents
	
      
	

    • 
	
      



	
		
	
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
        
            
						
                            
            
            				
            
                on Mar 3, 2011 5:42 PM
            
            
					
        
	
        

		
		
        
					
        John A
        
 
        I belive the design is correct. Because replaceing AD8139 with AD8138 works.
        
 
        (I also many different AD8139 parts to insure I not debugging a dead chip)
        
 
        I switched to AD8139 because I needed higher Temprature performance.
        
 
        Also spice simulation and Bench tests( With AD8138)  shows GAIN=1.
        
 
        I'm very confused.
        
 
             Stan
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

        • 

	
      



Reply

        


      • 
	
        



	
		
	
	



        
	
        
		
        
							
					
        
		
        
			
													0
							
			
				
									
							        
			
			
			
          
            
						
                            
            
            				
            
                on Mar 3, 2011 5:42 PM
            
            
					
          
	
          

		
		
          
					
          John A
          
 
          I belive the design is correct. Because replaceing AD8139 with AD8138 works.
          
 
          (I also many different AD8139 parts to insure I not debugging a dead chip)
          
 
          I switched to AD8139 because I needed higher Temprature performance.
          
 
          Also spice simulation and Bench tests( With AD8138)  shows GAIN=1.
          
 
          I'm very confused.
          
 
               Stan
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

          • 


        


Children
	
        No Data