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AD9674 Recommended for New Designs
The AD9674 is designed for low cost, low power, small size, and ease of use for medical ultrasound. It contains eight channels of a VGA with an LNA, a...
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AD9674 on Analog.com

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AD9674 Problems with Trigger



		

			

									
					    SeBaHu
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 21, 2020 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi there,
    

     
    

    Unfortunately we need help with the commissioning of the AD9674.
    

    We program the device via SPI as described in the data sheet. We use the chip grade of 80 MHz and the 12 bit operation without RF decimator and have adapted the places in the example. In the following the register description is described. Left is the address and right is the corresponding value.
    

                      //                adr         val
    

                                       0x000,      0x3c,                  
    

                                       0x002,      0x20,                  
    

                                       0x0ff,        0x01,                  
    

                                       0x004,      0x0f,                  
    

                                       0x005,      0x3f,                  
    

                                       0x113,      0x00,      
    

                                       0x011,      0x06,      
    

                                       0xf00,       0xff,                  
    

                                       0xf01,       0x7f,                  
    

                                       0xf02,       0x00,      
    

                                       0xf03,       0x80,                  
    

                                       0x10c,      0x00,                  
    

                                       0x014,      0x00,                  
    

                                       0x008,      0x00,                  
    

                                       0x021,      0x00,
    

                                       0x199,      0x80,            
    

                                       0x19B,      0x50,                  
    

                                       0x188,      0x01,
    

                                       0x18b,      0x27,            
    

                                       0x18c,      0x72,                  
    

                                       0x182,      0x82,
    

                                       0x10c,      0x20,
    

                                       0x00f,       0x18,                  
    

                                       0x02b,      0x40,
    

    But the AD9674 has a zero line on all 8 outputs. The SPI inputs of the ADC are controlled and 
    are controlled correctly.
    

    What could be possible reasons for this? Thanks for your help.