Products Mentioned

AD8337 Production
The AD8337 is a low noise, single-ended, linear-in-dB, general-purpose variable gain amplifier (VGA) usable at frequencies from dc to 100 MHz; the −3...
Datasheet
AD8337 on Analog.com

AD8330 Production
The AD8330 is a wideband variable gain amplifier for applications requiring a fully differential signal path, low noise, well-defined gain, and moderately...
Datasheet
AD8330 on Analog.com

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AD8337 supply

		
	
				

			

									
					    Dario90
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jan 16, 2018 
				
			
			
		

		
		                     
				
        		

		    
		    		    
		    			

			    
I'm trying to simulate on LTSPICE an AGC loop made by components whose supply is 3.3V max. After discovered here that my original choice for VGA, AD8330, has convergence problems on LTSPICE, I found interesting for me the AD8337 component, whose supply range is at least 5 V from the datasheet.

 
On LTspice however, I was able to test it and use it also with 3.3 V, without seeing any difference from 5V. Was those SPICE simulations reliable? Can I use AD8337 with 3.3V supply?

 
Thank you in advance 

 
Dario

			

			
									
		                             
                        

    

                                            
                 Analog Control Variable Gain Amplifiers (VGAs)
                
                                                    
                 amplifiers
                
                                                    
                 ad8337
                
                                                    
                 ad8330
                
                                                    
                 Variable Gain Amplifiers (VGA)
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			


				
	









	
    
	

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jan 16, 2018 1:11 PM
            
            
						
			            		
    
		
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    Hello,
    
 
    Thanks for the question.
    
 
    SPICE models are as reliable as the person who writes the model makes them. They are really a collection of matrix solutions, equations, specifications, etc. and other intangibles, they are not real.
    
 
    Our data sheets are released with information about the actual part, so you need to study the data sheet as well as utilize such tools as SPICE models. The AD8337 is designed for dual supplies with a ground based common, and the minimum supply voltage is +/-2.5V. If all you have is 3..3V, then there are a lot of dc-dc converters to provide the required operating voltages.
    
 
    Best,
    
 
    js
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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