Products Mentioned

ADXL327 Production
The ADXL327 is a small, low power, complete 3-axis accelerometer with signal conditioned voltage outputs. The product measures acceleration with a minimum...
Datasheet
ADXL327 on Analog.com

ADXL372 Recommended for New Designs
The ADXL372 is an ultralow power, 3-axis, ±200 g MEMS accelerometer that consumes 22 µA at a 3200 Hz output data rate (ODR). The ADXL372 does not power...
Datasheet
ADXL372 on Analog.com

Associated Drivers

  • State Verified Answer
  • Replies 1 reply
  • Subscribers 43 subscribers
  • Views 483 views
  • Users 0 members are here
Options
Related 

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
		
	
	
		

		
ADXL327 Noise msmts



		

			

									
					    ADIApproved
					
							

			
				
									
											
			
			
				
  •  Analog Employees  

			
			
			    	
			                    
                
				                on Jul 8, 2022 
				
			
			
		


				
		

		    		    
		    
		    		      		            		        
Category: Hardware

    		        		            		    
Product Number:  ADXL327 

    		        		    		    	
			
We are using the EVAL-ADXL372Z connected to and powered by ESP32 dev board. SPI rate is 10 MHz. 


The eval board is powered by the ESP32 dev board (which has a AMS1117-3.3 1A LDO, powered by PC’s USB VBUS).


The entire test setup in on the ground, away from any shock/vibration sources.


The sensor is set to Full bandwidth mode and the samples are read through the serial port.


We are experimenting with different sample rates to measure noise performance of the ADXL372. We see noticeable noise power at ~80 Hz (for 400Hz & 800Hz sampling rate) on all three axes in our fft graphs. Do you have any explanation for this noise? Can you suggest some experiments to help us determine the source of this noise?

									
			        
		


				
						
        

    
Tags: 
                                            
                 hardware
                
                                                    
                 accelerometers
                
                                                    
                 Sensors and MEMS
                
                                                    
                 adxl372
                
                                                    
                 adxl327
                
                                
            

    
    

		

			
						
									
									
						
						
			
			
			
			
		


        
        

					

			





















	

	

					



			








	
	
	
	



Parents
	
    
	

  • 
	
    



	
			
		
	



    
	
    
		
    
							
					
    
		
    
			
													0
							
			
				
									
							        
			
			
			
    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 13, 2022 4:52 PM
            
            
					
    
	
    

		
		
    
					
    Hi, 
    

    Sorry for the late reply. The issue that you describe is due to an ASIC bug. We have identified this "noise tones" appear at 1/5 of the sampling rate, which i think it matches with your observation. The noise density of the ADXL372 is specified so it accounts for this tones. 
    

    This tones cannot be avoided on the ADXL372, but you can use the ADXL371 as replacement. 
    

    I hope this helps, 
    

    Pablo. 
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

    • 

	




Reply

    


  • 
	
    



	
			
		
	



    
	
    
		
    
							
					
    
		
    
			
													0
							
			
				
									
							        
			
			
			
    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 13, 2022 4:52 PM
            
            
					
    
	
    

		
		
    
					
    Hi, 
    

    Sorry for the late reply. The issue that you describe is due to an ASIC bug. We have identified this "noise tones" appear at 1/5 of the sampling rate, which i think it matches with your observation. The noise density of the ADXL372 is specified so it accounts for this tones. 
    

    This tones cannot be avoided on the ADXL372, but you can use the ADXL371 as replacement. 
    

    I hope this helps, 
    

    Pablo. 
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

    • 





Children
	
No Data