Products Mentioned

AD8047 Production
The AD8047 and AD8048 are very high speed and wide bandwidth amplifiers. The AD8047 is unity gain stable. The AD8048 is stable at gains of two or greater...
Datasheet
AD8047 on Analog.com

AD9744 Production
The AD97441 is a 14-bit resolution, wideband, third generation member of the TxDAC series of high performance, low power CMOS digital-to-analog converters...
Datasheet
AD9744 on Analog.com

  • State Verified Answer
  • Replies 7 replies
  • Subscribers 37 subscribers
  • Views 2744 views
  • Users 0 members are here
Options 

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
			
	
	
		

		
AD8047 problem



		

			

									
					    Bhavya
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 22, 2011 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi ,
    
 
    Im using AD9744 DAC for one of my project and AD8047 for I_V converter for that DAC. Im getting output voltage twice the Input to adc fron AD8047.
    
 
    Can anyone tell me how to connect onli one OUTA to AD8047.
    
 
    Regards,
    
 
    Bhavya
    
									
			        
		
    

				
							SCHEMATIC156.pdf
							
        

    
    Tags: 
                                            
                 ad9744
                
                                                    
                 Video Amplifiers and Analog Video Functions
                
                                                    
                 ad8047
                
                                                    
                 Standard High Speed D/A Converters
                
                                                    
                 Video Operational Amplifiers (Op Amps)
                
                                        
                                            
                
                
                                
                    Show More
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



Parents
	
      
	

    • 
	
      



	
		
	
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
        
            
						
                            
            
            				
            
                on Dec 23, 2011 7:21 PM
            

            
					
        
	
        

		
		
        
					
        Bhavya,
        
 
        The  AD9744 converts input digital word to differential current outputs at IOUTA and IOUTB. These currents are converted to voltages across R410 & R411. This differential voltage is fed as input to differential amplifier AD8047.
        
 
        The gain of the amplifier is decided by ratio (R404/R405. R409 = R404 and R406 = R405). At present it is 500E/225E = 2.2222, which is why you are getting doubled output. In case you need 1:1 output, you will have to replace R404, R405, R406 and R409 by equal value resistors.
        
 
        The op amp output DAC2_VOUT is single ended with respect to analog ground.
        
 
        Hope this helps.
        
 
        Regards,
        
 
        JayantD
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

        • 

	

      • 
	
        



	
		
	
	



        
	
        
		
        
							
					
        
		
        
			
													0
							
			
				
									
							        
			
			
			
          
            
						
                            
            
            				
            
                on Mar 14, 2019 5:15 AM
            

            
												
						in reply to JayantD
					
									
          
	
          

		
		
          
					
          Why is the output  voltage  value of  AD9744 decided by R410 & R411?? Don't they just decide the currents of AD9744??
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

          • 

	
        



Reply



Children
	
        No Data