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ADA4898-2 Production
The ADA4898 is an ultralow noise and distortion, unity gain stable, voltage feedback op amp that is ideal for use in 16-bit and 18-bit systems with power...
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ADA4898-2 on Analog.com

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Need help to evaluate op amp consumption on ADA4898-2



		

			

									
					    glias
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 15, 2011 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    
 
    I would want to know what is the method to evaluate the power consumption of preamp stage. I use a low noise amplifier (ADA4898-2 which is used +6V/-6V supply rails), and I'm not sure to understand the graph figure 4 on the datasheet : Does it means that the ADA4898 could support 3W@30°C for the ADA4898-2, does it means that for the ADA4898-2 that the power dissipation should be divide by 2 to know the power dissipation of one op amp ?
    
 
    How can I do to estimate the consumption of a stage ? Does it exist a method ? 
    
 
    I hope that someone could help me.
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Operational Amplifiers (Op Amps)
                
                                                    
                 amplifiers
                
                                                    
                 Precision Op Amps (Vos ≤1mV & TCVos ≤2uV/C)
                
                                                    
                 ada4898-2
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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                on Dec 20, 2011 2:10 PM
            

            
					
        
	
        

		
		
        
					
        Hi Charlyelkhoury,
        
 
        Thanks a lot for your help.
        
 
        Well, It helps me to understand the graph, thanks.
        
 
        Now if I take a simple example :
        
 
        I have two inverting stage, with a load of 100 ohms with a voltage rails of +6V (VCC) and -6V (VEE)
        
 
        How can I do to evaluate the power consumption of the amplifier ?
        
 
        if I consider that the amplifier should be in linear zone, I have a current of 40mA (datasheet), so a power of (VCC*40mA)*2 + 8.7mA*2 ? Can I evaluate it by that way ?
        
 
        8.7mA is the max Quiescent Current per Amplifier.
        
 
        regards
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
						
                            
            
            				
            
                on Dec 20, 2011 2:10 PM
            

            
					
          
	
          

		
		
          
					
          Hi Charlyelkhoury,
          
 
          Thanks a lot for your help.
          
 
          Well, It helps me to understand the graph, thanks.
          
 
          Now if I take a simple example :
          
 
          I have two inverting stage, with a load of 100 ohms with a voltage rails of +6V (VCC) and -6V (VEE)
          
 
          How can I do to evaluate the power consumption of the amplifier ?
          
 
          if I consider that the amplifier should be in linear zone, I have a current of 40mA (datasheet), so a power of (VCC*40mA)*2 + 8.7mA*2 ? Can I evaluate it by that way ?
          
 
          8.7mA is the max Quiescent Current per Amplifier.
          
 
          regards
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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