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ADV7391 Not Recommended for New Designs
The ADV7390 / ADV7391 / ADV7392 / ADV7393 are a family of high speed, digital-to-analog video encoders on single monolithic chips. Three 2.7 V/3.3 V 10...
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ADV7391 on Analog.com

ADV7390 Not Recommended for New Designs
The ADV7390/ADV7391/ADV7392/ADV7393 are a family of high speed, digital-to-analog video encoders on single monolithic chips. Three 2.7 V/3.3 V 10-bit video...
Datasheet
ADV7390 on Analog.com

AD7391 Production
The AD7390 / AD7391 family of 10- and 12-bit voltage-output digital-to-analog converters are designed to operate from a single +3 volt supply. Built using...
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AD7391 on Analog.com

ADA4431-1 Production
The ADA4431-1 is a fully integrated video reconstruction filter that combines excellent video specifications with low power consumption, making it ideal...
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ADA4431-1 on Analog.com

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RSET of ADV7391



		

			

									
					    sakurai
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 1, 2020 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    The AD7391 can use load drive mode and the output current of 4.3mA is defined as full scale current operation at 300ohm load.
    Now we are considering the configuration with ADA4431-1 in the load drive mode. The range is insufficient for full scale current operation, is there any table for the output voltage range by changing the value of Rset?
    
									
			        
		
    

				
						
        

    
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                 Single-Channel Voltage Output D/A Converters
                
                                                    
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                 Video Amplifiers and Analog Video Functions
                
                                                    
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      •  Analog Employees  
      •  Super User  
      
            
						
                            
            
            				
            
                on Sep 1, 2020 6:17 AM
            
            
					
      
	
      

		
		
      
					
      Hi,
      

       As per ADV739x specification, COMP and Rset pin definition as,
      

      RSET Controls the amplitudes of the DAC 1, DAC 2, and DAC 3 outputs.  For full-drive operation (for example, into a 37.5 Ω load), a 510 Ω resistor must be connected from RSET to AGND. 
      For low-drive operation (for example, into a 300 Ω load), a 4.12 kΩ resistor must be connected from RSET to AGND.

      COMP Compensation Pin. Connect a 2.2 nF capacitor from COMP to VAA;
      

      ADV739x contains three DACs. All three DACs can be configured to operate in full-drive mode.Full-drive mode is defined as 34.7 mA full-scale current into a 37.5 Ω load, RL.Full drive is the recommended mode of operation for the DACs.
      

      Alternatively, all three DACs can be configured to operate in low-drive mode.
      Low-drive mode is defined as 4.33 mA full-scale current into a 300 Ω load, RL.
      

      The ADV739x contains an RSET pin. A resistor connected between the RSET pin and AGND is used to control the full-scale output current and, therefore, the output voltage levels of DAC 1, DAC 2, and DAC 3. For full-drive operation, RSET must have a value of 510 Ω and RL must have a value of 37.5 Ω. For low-drive opera-tion, RSET must have a value of 4.12 kΩ, and RL must have a value of 300 Ω. The resistor connected to the RSET pin should have a 1% tolerance.
      

      The ADV739x contains a compensation pin, COMP. A 2.2 nF compensation capacitor should be connected from the COMP pin to VAA.

      The ADA4433 application circuit should be from the CN0264 as below web link
      Circuit Note | CN0264 | A Robust Solution for Transmitting Composite Video with Output Short-to-Battery Protection | Ana…
      

      

      Thanks,
      

      Poornima
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Sep 3, 2020 8:58 PM
            
            
												
						in reply to PoornimaSubramani
					
									
        
	
        

		
		
        
					
        Thanks for the answer.
        I'd like to use the ADA4431, but does that mean I can't use the ADV739x combination to match the range, etc.?
        What is the background of your recommendation for ADA 4433?
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        •  Super User  
        
            
						
                            
            
            				
            
                on Sep 4, 2020 9:48 AM
            
            
												
						in reply to sakurai
					
									
        
	
        

		
		
        
					
        Hi,
        

         ADV443x are same family, so we just we give an example for ADV7391-ADA4433 schematic and hardware connection.
        

         Also please refer expert suggestion when using ADV7391 with ADA4431 at https://ez.analog.com/video/f/q-a/100208/adv7391-cable-detection-not-working/297861#297861
        

        

        Thanks,
        

        Poornima
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
						
						
				
				
		
		
        
			
		
        
	
        

        

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