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          EEPW首頁(yè) 
	 > 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(duì)精度電壓輸出
          
    
          

          

          


	
	
	

          
	
          
		
          
			
          選擇合適的系列電壓基準(zhǔn)源的絕對(duì)精度電壓輸出
          
						
          
				作者：
				時(shí)間：2012-01-30
				來(lái)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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