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AD630 Production
The AD630 is a high precision balanced modulator/demodulator that combines a flexible commutating architecture with the accuracy and temperature stability...
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AD630 on Analog.com

AD5292 Production
The AD5291 and AD5292 are single-channel, 256-/1024-position digital potentiometers that combine industry leading variable resistor performance with nonvolatile...
Datasheet
AD5292 on Analog.com

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Lockin amplifier AD630

		
	
				

			

									
					    fbassan
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 3, 2023 
				
			
			
		
    
		
		                    	    
    
        	    
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                The user inquired about using the AD5292BRUZ-20 digital potentiometer for differential and common mode offset adjustments. The final answer recommends using a 10k potentiometer for balancing the collector current sources and compensating for transistor mismatches. The engineer also asked about the specific reasons for choosing a digital pot over a simpler trim pot.
                        	    
    
                
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    Category: Hardware
    
    		        		            		    
    Product Number:  AD630 
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hi Dear,
    

    Can I use a 20k digital potentiomenter (AD5292BRUZ-20) in the differential offset ajust and (other AD5292BRUZ-20) in the commum mode offset adjust?
    
			
    
			
									
		                             
                        

    
    
                                            
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jan 8, 2023 8:32 PM
            
            
						
			            		
      
		
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      Hi  
      

      Regarding the resistance value, we recommend using 10k pot. The pot is used to balance the collector current sources of the input transconductance stage and compensates for mismatches in transistor sizes, due to this the 10k value is OK.
      

      May we ask the reason why you want to use a digital potentiometer? Is it something about the accuracy of resistance values, or you want to implement a system that can change the resistance values based on the resulting output voltages (feedback control system)? A simple trim pot is also applicable for this application since it is much simpler and cheaper.
      

      Regards,
      JE
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jan 8, 2023 8:32 PM
            
            
						
			            		
      
		
										0
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hi  
      

      Regarding the resistance value, we recommend using 10k pot. The pot is used to balance the collector current sources of the input transconductance stage and compensates for mismatches in transistor sizes, due to this the 10k value is OK.
      

      May we ask the reason why you want to use a digital potentiometer? Is it something about the accuracy of resistance values, or you want to implement a system that can change the resistance values based on the resulting output voltages (feedback control system)? A simple trim pot is also applicable for this application since it is much simpler and cheaper.
      

      Regards,
      JE
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

      • 


    


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