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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) 收藏
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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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