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AD7768-1 Recommended for New Designs
The AD7768-1 is a low power, high performance, Σ-Δ analog-to-digital converter (ADC), with a Σ-Δ modulator and digital filter for precision conversion...
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AD7768-1 on Analog.com

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ad7768-1 FIR Decimation 32-64 not working



		

			

									
					    rwoerle
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 20, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Software
    
    		        		            		    
    Product Number:  ad7768-1 
    
    		        		        		        
    Software Version: -
    
    		    		    	
			
    Dear Team
    

    

    We are working on this chip and can happily use any decimation rates with sinc5 and sinc3 filters applied.
    

    Only FIR doesnt work with 32 and 64 decimations , it starts working with 128 decimation resulting in a 64ksps rate.
    

    FIR 128 OK !
    

     
    

    FIR 64 not ok no answer , RDY not falling
    

    

    

     
    

    FIR 32 no ok .. same thing no answer
    

     
    

    

    

    Any hints why it doesnt answer ?? ...
    

    Remark , we use the SPI reset with 1 high and 63 zeros at the beginning