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ADR1001 Bipolar ±5V DAC Drive Using

		
	
				

			

									
					    miky
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 21, 2025 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user encountered an issue with the ADR1001 in LTspice where setting the negative supply to -7V or lower results in an output of -1V, indicating potential protection function activation. The final answer confirms this is a known issue with the LTspice model affecting the INV1 and INV2 pins, and it does not reflect the actual performance of the ADR1001 with a negative heater GND.
                        	    
    
                
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    Category: Software
    
    		        		            		    
    Product Number:  ADR1001 
    
    		        		        		        
    Software Version: LTspice
    
    		    		    
    
		    		    
		    			
    
			    
    Hello.
    

    I have a question about ADR1001.
    

    I designed the circuit in LTspice based on Figure 47 in the datasheet, but setting the negative supply to -7V results in an output of -1V.
    

    When a negative supply of -7V or lower is applied, it appears the protection function is activated. Is this behavior correct?
    

     
    

     
    

     
    

    

    Best regards.
    
			
    
			
									
		                                 
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Sep 22, 2025 3:47 PM
            
            
						
			            		
      
		
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      Thanks for the question. There is a known issue with the LTspice model for ADR1001 when using a negative heater GND, which specifically affects the INV1 and INV2 pins. We are working on getting this model updated to address this issue, but in the meantime, this behavior is not representative of the ADR1001s actual performance with a negative heater GND.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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