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          EEPW首頁 
	 > 模擬技術(shù) > 設(shè)計應(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：
				時間：2012-01-30
				來源：網(wǎng)絡(luò)

							
				
				
				
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			DING-TOP: 0px">
          Output Voltage
          Range = 0 -2.5V
          Range = 0 - 4.096V
          Range = 0 -4.000V
          Range = 0 -2.048V
          DAC Output
          Force/sense
          Fixed gain = 1.638
          Fixed gain = 2
          Fixed gain = 1.638
          Power Supply
          5V(varying)
          4.5V min
          5.5V max
          5V(constant)
          4.95V min
          +12V available
          5V(constant)
          4.75V min
          5.25V max
          3V(varying VBATT)
          2.7V min
          3.6V max
          Temperature Range
          0°C to 70°C (commercial)
          0°C to 70°C (commercial)
          -40°C to 85°C (extended)
          15°C to 45°C ( commercial)
          Signal BW
          10Hz to 10kHz
          DC to 1kHz
          DC to 10Hz
          DC to 10Hz
          DAC Calibration
          None
          Burn-in + 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)
          8LSB @ 12 bits (9-bit accuracy)

          Step 1: Voltage Ranges and Reference-Voltage Determination
          The first consideration when selecting a voltage reference for a DAC application is to evaluate the supply-voltage and the DAC output-voltage ranges (Table 2). To simplify the design examples described above, DACs have already been chosen, so their output gain is not a variable we will trade off as in a real design.

          Table 2. Voltage-Related Parameters for DAC Design Examples
                Parameter
                Design A
                Design B
                Design C
                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
				
            
                
			
							
                
                
			            
                            
              
            
		
		
                
		
                
		
                
		
                
			
                  
				
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