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	 > 模擬技術 > 設計應用 > 選擇合適的系列電壓基準源的絕對精度電壓輸出
          
    
          

          

          


	
	
	

          
	
          
		
          
			
          選擇合適的系列電壓基準源的絕對精度電壓輸出
          
						
          
				作者：
				時間：2012-01-30
				來源：網(wǎng)絡
				
				
				
				
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			GHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px">
          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
          Annual (gain and offset)
          One-time factory (gain and offset)
          None
          Max Error Target
          15625ppm (16LSB @ 10 bits)
          122ppm (2LSB @ 14 bits)
          977ppm (4LSB @ 12 bits)
          3906ppm (16LSB @ 12 bits)

          Each example is analyzed, focusing on the specifications that apply to that particular design. The results of this analysis, along with the results of the previous section, are summarized in an error budget in Table 5.

          It is most convenient to do the error-budget accounting in ppm, although this could be done equivalently in other units such as %, mV, or LSBs. It's important to apply the proper scaling and to use the proper normalization factor to get the correct error values. Reference error terms can be equivalently calculated relative to the reference voltage or the DAC output voltage. For example, if we assume a reference error of 2.5mV (noise, drift, etc.) and a reference voltage of 2.5V, we get the following:
          Reference Output Error = 106 × 2.5mV / 2.5V = 1000ppm
          If we assume that the DAC output amplifier has a gain of 2.0, both the error and the reference voltage are scaled, so we get the same result at the DAC output (5V full-scale range):
          DAC Output Error = 106 × (2.5mV × 2) / (2.5V × 2) = 1000ppm
          Table 5. Error-Budget Analysis
          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
          Digital offset and gain adjustment
          Portable instrument
          Reference Initial Error
          4000ppm
          -
          -
          1600ppm
          Reference/DAC Post- Calibration Error
          -
          0ppm
          244ppm
          -
          Reference Tempco Error
          		
				
          
					
					
		  			
		  			
					
				
          
			
                
			
							
          
                
			            
                            
              
            
		
		
          
		
          
		
          
		
          
			
            
				
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