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        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:網絡 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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