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Parallel DAC with High Voltage Output (+18V)



		

			

									
						soumyabumba
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Aug 6, 2014 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hi can anyone recommend a parallel input DAC with high voltage output upto +18V useful for tuning of tunable filters from Hittite? If a parallel input-current out DAC is available for the purpose, how to convert it to voltage out without any offsets? I have with me AD5501 but it is a serial in DAC. I need parallel bits input.

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	











	

	

					



			








	
	
	
	



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                on Aug 7, 2014 9:04 AM
            
            
					
    
	
    

		
		
    
					
    Thank you Mark and KenK for your suggestions. AD5546 may be the suitable part that I need but I have some doubts being a beginner in using DACs.
    
 
    1. What is meant by quadrant of a DAC?
    
 
    2. In my application most probably I need to use AD5546 in "Two-Quadrant Multiplying Mode Vout = 0 to +VREF" (Page 12 of datasheet). In Figure 20 for this mode, a +10 to -10V sinusoidal reference is given in R1A with an additional OPA2177 (U2A) connected between RCOMA and VREFA. Whereas in the equivalent circuit (Figure 19) to generate negative Vout "Two-Quadrant Multiplying Mode Vout = 0 to -VREF" just a positive 2.5V voltage reference ADR03 is used for all those pins. My doubt is why that extra opamp is required. Can we not use any -2.5V reference in this mode?
    
 
    3. What may be the best replacement for OPA2177 opamp that can safely operate upto +18V? The DAC output goes to varactor based tunable devices which tend to be very noise-sensitive. So a very low noise, high voltage opamp is required.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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													0
							
			
				
									
							        
            
                                    			
			                            
                        
                on Aug 7, 2014 9:04 AM
            
            
					
    
	
    

		
		
    
					
    Thank you Mark and KenK for your suggestions. AD5546 may be the suitable part that I need but I have some doubts being a beginner in using DACs.
    
 
    1. What is meant by quadrant of a DAC?
    
 
    2. In my application most probably I need to use AD5546 in "Two-Quadrant Multiplying Mode Vout = 0 to +VREF" (Page 12 of datasheet). In Figure 20 for this mode, a +10 to -10V sinusoidal reference is given in R1A with an additional OPA2177 (U2A) connected between RCOMA and VREFA. Whereas in the equivalent circuit (Figure 19) to generate negative Vout "Two-Quadrant Multiplying Mode Vout = 0 to -VREF" just a positive 2.5V voltage reference ADR03 is used for all those pins. My doubt is why that extra opamp is required. Can we not use any -2.5V reference in this mode?
    
 
    3. What may be the best replacement for OPA2177 opamp that can safely operate upto +18V? The DAC output goes to varactor based tunable devices which tend to be very noise-sensitive. So a very low noise, high voltage opamp is required.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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