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AD9102 Production
The AD9102 TxDAC and waveform generator is a high performance digital-to-analog converter (DAC) integrating on-chip pattern memory for complex waveform...
Datasheet
AD9102 on Analog.com

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AD9102 SPI connection question



		

			

									
					    Neddie
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 16, 2015 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi to all. 
    
 
    I'm new to this forum , so I hope I'm in the correct place for my question.
    
 
    I'm trying to connect a pic24Fj series processor to the AD9102 DDS chip , and I'm a little confused
    
 
    about the SPI connections.CS , RESET and SCLK are fairly obvious. Do I connect the SPI data out (MOSI)
    
 
    to the SDIO and the SPI Data in (MISO) to the SDO/SDI2/DOUT pins? 
    
 
    Figure 31 in the datasheet indicates that you would ONLY use the SDIO pin for the data transfer in 3 wire mode.
    
 
    This would require that the data direction would have to change from output to input during the transfer.
    
 
    Can the pic processor do this with it's spi peripheral? If I were bit banging the SPI , it would be simple , but I'd rather use 
    
 
    a peripheral if I can.I'm 
    
 
    I've tried 4 wire mode , but I'm getting nothing coming out of SDO pin at all.I'm reading the DACRSET register as it has a 
    
 
    non zero reset value.
    
 
    Hope I'm not being to vague here.
    
 
    Cheers
    
 
    Neddie
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 ad9102
                
                                                    
                 clock and timing
                
                                                    
                 Direct Digital Synthesis (DDS)
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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                on Jan 17, 2015 7:39 AM
            
            
					
        
	
        

		
		
        
					
        Thanks Larry.
        
 
        Still not having any luck though , must be something else wrong 
        
 
        I assume you can load the registers in any order. I've just created a loop an
        
 
        ran through from 0 to 0x60 programming the device. What should be done with the
        
 
        trigger input? I've tried it high and low , no difference.
        
 
        It's a hand built board , so while I'm pretty confident I have it all ok , it's a pretty tough
        
 
        chip to solder , especially the pad underneath!!
        
 
        Not really sure where to go from here 
        
 
        Cheers
        
 
        Ned
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
						
                            
            
            				
            
                on Jan 17, 2015 7:39 AM
            
            
					
          
	
          

		
		
          
					
          Thanks Larry.
          
 
          Still not having any luck though , must be something else wrong 
          
 
          I assume you can load the registers in any order. I've just created a loop an
          
 
          ran through from 0 to 0x60 programming the device. What should be done with the
          
 
          trigger input? I've tried it high and low , no difference.
          
 
          It's a hand built board , so while I'm pretty confident I have it all ok , it's a pretty tough
          
 
          chip to solder , especially the pad underneath!!
          
 
          Not really sure where to go from here 
          
 
          Cheers
          
 
          Ned
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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