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

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AD8139 Not Working. I need help

		
	
				

			

									
					    sschekall
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 23, 2011 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user is experiencing issues with the AD8139 not outputting any signal on the bench, despite working in SPICE simulations and with the AD8138. The final answer suggests the issue was resolved offline, but recommends converting the circuit to a 4-resistor topology for better performance and less noise. The user noted the input signal amplitude is 0.600V p-p and VCM is 0.36V DC, with supply voltages of ±5V.
                        	    
    
                
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    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
    
			
    
			
									
		                             
                        

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

				
							osc_5MHZ.pdf