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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) 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
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              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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