Products Mentioned

ADXL345 Production
The ADXL345 is a small, thin, low power, 3-axis accelerometer with high resolution (13-bit) measurement at up to ±16g. Digital output data is formatted...
Datasheet
ADXL345 on Analog.com

Associated Drivers

ADXL202 Obsolete
Please see the ADXL203. The ADXL202E is a low-cost, low-power, complete dual-axis iMEMS® accelerometer with a measurement range of ±2g. The ADXL202 can...
Datasheet
ADXL202 on Analog.com

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Noise peformance on ADXL345 and ADXL202

		
	
				

			

									
					    Tarzan
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 20, 2014 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    I wondered which has a better noise peformance between analogoutput type and digital outputtype.
    According to the datasheet ADXL202(analog output type),
    The output noise is 1.4mg_rms@100Hz from Table 7.
    http://www.analog.com/static/imported-files/data_sheets/ADXL103_203.pdf
    
 
    On the other hand, ditital output type, ADXL345's noise peformance is 0.75LSBrms LSB@100Hz from the datasheet.
    http://www.analog.com/jp/mems-sensors/mems-inertial-sensors/adxl345/products/product.html
    
 
    I'm not sure that which is a better spec between 0.75LSBrms and 1.4mg_rms.
    Please tell me how to compare [mgrms] and [LSBrms].
    
 
    Best,
    Tarzan
    
			
    
			
									
		                             
                        

    
    
                                            
                 adxl202
                
                                                    
                 accelerometers
                
                                                    
                 Sensors and MEMS
                
                                                    
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							FormerMember
					
      
		
      
			
				
									FormerMember
							        
			
			
			
    
            
						
                            
            
            				
            
                on Feb 20, 2014 1:49 PM
            
            
						
			            		
    
		
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    Hi Tarzan,
    
 
    The sensivity of ADXL345 is 3.9mg/LSB, so 0.75LSBrms meanse 0.75 * 3.9 = 2.925mg_rms. It is worse than 1.4mg_rms. What's more, ADXL202 is obsolete, ADXL203 is recommended to replace it.
    
 
    BR
    
 
    Neil
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    


	

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                on Feb 24, 2014 11:04 AM
            
            
						
			            		
      
		
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      Hi Neil,
      
 
      Thanks for your prompt reply.
      
 
      I understand it.
      
 
      Best regards,
      
 
      Tarzan
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Aug 2, 2018 10:34 AM
            
            
						
			            		
        
		
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        This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

        Thank you,
        EZ Admin
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
						
						
				
				
		
		
        
			
		
        
	
        

        

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