Products Mentioned

AD9910 Recommended for New Designs
The AD9910 is a direct digital synthesizer (DDS) featuring an integrated 14-bit DAC and supporting sample rates up to 1 GSPS. The AD9910 employs an advanced...
Datasheet
AD9910 on Analog.com

Thread Details

  • State Verified Answer
  • Replies 3 replies
  • Subscribers 47 subscribers
  • Views 670 views
  • Users 0 members are here
Options 

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
		
	
	
		

	    
	    
	    		
Is AD9910 IO_UPDATE line gated by chip select?

		
	
				

			

									
					    DavidLee
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Sep 13, 2014 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user asks if multiple AD9910 DDS chips can share a common IO_UPDATE line, independent of chip select. The final answer confirms that the IO_UPDATE line is not gated by chip select, so sharing it could cause old data to be transferred to active registers. The engineer recommends using separate IO_UPDATE lines for each AD9910 to avoid unintended updates, even though the chips can share the serial data clock and data lines.
                        	    

                
                     AI Generated Content
                
    	    

             
				
        		

		    
		    		    
		    			

			    
Hi,

 
I have a few AD9910s that need to share a common serial port from my MCU. I use chip select to enable serial IO to one device at a time.

 
My question is: Can several AD9910s share a common IO UPDATE line? Is the IO UPDATE line enabled by chip select? It's not clear in the data sheet.

 
Cheers,

 
David

			

			
									
		                             
                        

    

                                            
                 clock and timing
                
                                                    
                 Clocks & Timers
                
                                                    
                 Direct Digital Synthesis (DDS)
                
                                                    
                 ad9910