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	 > 模擬技術(shù) > 設(shè)計(jì)應(yīng)用 > 選擇合適的系列電壓基準(zhǔn)源的絕對精度電壓輸出
        
    
        

        

        


	
	
	

        
	
        
		
        
			
        選擇合適的系列電壓基準(zhǔn)源的絕對精度電壓輸出
        
						
        
				作者：
				時(shí)間：2012-01-30
				來源：網(wǎng)絡(luò)
				
				
				
				
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			R>
        Design D
        Main Design Objectives
        Low cost, loose accuracy
        High absolute accuracy and precision
        One-time calibrated, low drift
        Low voltage, battery powered, moderate accuracy
        Example Application
        Consumer audio device
        Lab instrument
        Digital offset and gain adjustment
        Portable instrument
        DAC Calibration
        None
        Annual (gain and offset)
        One-time factory (gain and offset)
        None
        Maximum Error Target
        16LSB @ 10 bits (6-bit accuracy)
        2LSB @ 14 bits (13-bit accuracy)
        4LSB @ 12 bits (10-bit accuracy)
        16LSB @ 12 bits (8-bit accuracy)
        Estimated Initial Accuracy (from Step 2)
        0.4% (4LSB @ 10 bits)
        Not critical due to gain calibration
        Not critical due to gain calibration
        0.32% (3200ppm)
        Estimated Tempco (from Step 2)
        75ppm/°C
        2ppm/°C
        5ppm/°C
        20ppm/°C
        Reference Voltage(VREF) (from Step 1)
        2.5V
        2.5V
        2.048V
        1.25V
        Minimum Reference Input Resistance from Data Sheet (RMIN)
        18kΩ
        18kΩ
        7kΩ (14kΩ||14kΩ shared reference inputs)
        18kΩ
        Maximum Output Current Requirement (VREF/RMIN)
        140μA max
        140μA max
        293μA max (dual DACs)
        69μA max
        Voltage-Reference Candidates (Initial Accuracy, Tempco, Output Curren 
				
            
                
			
							
        
                
			            
                            
              
            
        
		
        
		
        
		
        
		
        
		
        
			
          
				
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