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SSM2019 fails with high input current



		

			

									
					    David2013
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on May 25, 2014 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    We are using SSM2019 for balanced MIC pre-amp. It is powered by +/- 15v source.
    
 
    Occassionaly a device fails in operation with no apparent reason. When testing failed device with multi-meter it looks like the input stage broke but I can't be sure on that.
    
 
    The design include schottky diodes (BAR43CFILM) for clamping the input signals. In addition the microphone input connector has ESD protection diodes (TPD2E007).
    
 
    Any ideas?
    
 
    Thanks,
    
 
    David
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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