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MAX86150 Production
The MAX86150 is an integrated electrocardiogram, pulse oximeter, heart rate monitor sensor module. It includes internal LEDs, photodetector, and low-noise...
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MAX86150 on Analog.com

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Sample rate of the MAX86150 is not accurate

		
	
				

			

									
					    AliGhorbani
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 3, 2026 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user experiences an inaccurate sample rate of 200.185 sps and 199.45 sps with the MAX86150 for ECG and PPG recordings, instead of the desired 200 sps. The final answer confirms that the sample rate can vary between 196 to 204 sps according to the datasheet, which is within the expected range.
                        	    
    
                
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    Category: Hardware
    
    		        		            		    
    Product Number:  MAX86150 
    
    		        		    		    
    
		    		    
		    			
    
			    
    I am recording data with MAX86150, the sample rate is set to 200sps for ECG and PPG. but when I record the data for each IC the sample rate is a number near 200 and it is not accurate.
    

    this is the result:
    

    recording time = 24:29:06 (HH:MM:SS) = 88146s 
    

    the desired samples based on the recording time = 88146 x 200 = 17629200 samples
    

    but total samples generated by MAX86150 = 17645525 samples
    

    real sample rate = 17,645,525 / 88,146 = 200.185 sample per second
    

    

    this test with another MAX86150 IC results 199.45sps. 
    

    

    Has anyone else faced this problem? and is there any solution to solve this problem?
    

    
			
    
			
									
		                                 
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                 hardware
                
                                                    
                 Optical Sensing Technology
                
                                                    
                 sample per second
                
                                                    
                 Optical Modules
                
                                                    
                 max86150
                
                                        
                                            
                
                
                                
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