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AD7779 Recommended for New Designs
The AD7779 is an 8-channel, simultaneous sampling ADC. There are eight full Σ-Δ ADCs on chip. The AD7779 provides an ultralow input current to allow...
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AD7779 on Analog.com

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Any advice on reading the AD7779 DOUT0 using an STM32 SAI input?



		

			

									
					    david.everett
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 31, 2017 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    
 
    I'm trying to read samples from all eight channels of an AD7779. I've got the SPI control interface up and running with very few problems but I need to route the analogue samples through the digital serial interface into an SAI input on an STM32F746-family ARM. I can see the DCLK, DRDY and DOUT0 are being driven but the processor doesn't seem to register the data arrival.
    
 
    There's very little support from ST unless you want to use the SAI in a pure audio capacity, but I need to use the interface in "freeform" mode.
    
 
    I'd appreciate any advice - good or bad!
    
 
    Thanks in advance,
    
 
    Dave
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 sai
                
                                                    
                 stm32
                
                                                    
                 ad7779
                
                                                    
                 Simultaneous Sampling A/D Converters
                
                                                    
                 Precision A/D Converters
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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                on Nov 2, 2017 9:33 AM
            
            
					
        
	
        

		
		
        
					
        Thanks for the response Lluis,
        
 
        Unfortunately, I need to use the DOUT interface as the SPI would be too slow, plus my target hardware designer wants to use the DOUT interface so I'm being pushed that way by system design (doesn't mean to say that we won't end up using the SPI!).
        
 
        On the SPI side of things, I've got everything I need already running but thanks for the link.
        
 
        Do you have any experience interfacing any type of ARM device to the DOUT interface? ARMs tend to have lots of commonality so there could be a clue elsewhere - a trawl of the web doesn't give me any real help.
        
 
        Thanks in advance,
        
 
        Dave
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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                on Nov 2, 2017 9:33 AM
            
            
					
          
	
          

		
		
          
					
          Thanks for the response Lluis,
          
 
          Unfortunately, I need to use the DOUT interface as the SPI would be too slow, plus my target hardware designer wants to use the DOUT interface so I'm being pushed that way by system design (doesn't mean to say that we won't end up using the SPI!).
          
 
          On the SPI side of things, I've got everything I need already running but thanks for the link.
          
 
          Do you have any experience interfacing any type of ARM device to the DOUT interface? ARMs tend to have lots of commonality so there could be a clue elsewhere - a trawl of the web doesn't give me any real help.
          
 
          Thanks in advance,
          
 
          Dave
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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