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  • 參數(shù)資料
    型號: S12SCIV2
    廠商: Motorola, Inc.
    英文描述: MC9S12DT128 Device User Guide V02.09
    中文描述: MC9S12DT128設(shè)備的用戶手冊V02.09
    文件頁數(shù): 107/138頁
    文件大小: 2083K
    代理商: S12SCIV2
    MC9S12DT128 Device User Guide — V02.09
    107
    A.2 ATD Characteristics
    This section describes the characteristics of the analog to digital converter.
    A.2.1 ATD Operating Characteristics
    The
    Table A-8
    shows conditions under which the ATD operates.
    The following constraints exist to obtain full-scale, full range results:
    V
    SSA
    V
    RL
    V
    IN
    V
    RH
    V
    DDA
    .
    This constraint exists since the sample buffer amplifier can not drive
    beyond the power supply levels that it ties to. If the input level goes outside of this range it will effectively
    be clipped.
    Table A-8 ATD Operating Characteristics
    A.2.2 Factors influencing accuracy
    Three factors – source resistance, source capacitance and current injection – have an influence on the
    accuracy of the ATD.
    A.2.2.1 Source Resistance:
    Due to the input pin leakage current as specified in
    Table A-6
    in conjunction with the source resistance
    there will be a voltage drop from the signal source to the ATD input. The maximum source resistance R
    S
    Conditions are shown in
    Table A-4
    unless otherwise noted
    Num C
    Rating
    Symbol
    Min
    Typ
    Max
    Unit
    1
    D
    Reference Potential
    Low
    High
    V
    RL
    V
    RH
    V
    SSA
    V
    DDA
    /2
    4.50
    V
    DDA
    /2
    V
    DDA
    5.25
    V
    V
    2
    C Differential Reference Voltage
    1
    NOTES
    :
    1. Full accuracy is not guaranteed when differential voltage is less than 4.50V
    2. The minimum time assumes a final sample period of 2 ATD clocks cycles while the maximum time assumes a final sample
    period of 16 ATD clocks.
    V
    RH
    -V
    RL
    f
    ATDCLK
    5.00
    V
    3
    D ATD Clock Frequency
    0.5
    2.0
    MHz
    4
    D
    ATD 10-Bit Conversion Period
    Clock Cycles
    2
    Conv, Time at 2.0MHz ATD Clock f
    ATDCLK
    N
    CONV10
    T
    CONV10
    14
    7
    28
    14
    Cycles
    μ
    s
    5
    D
    ATD 8-Bit Conversion Period
    Clock Cycles
    (2)
    Conv, Time at 2.0MHz ATD Clock f
    ATDCLK
    N
    CONV8
    T
    CONV8
    12
    6
    26
    13
    Cycles
    μ
    s
    6
    D Stop Recovery Time (V
    DDA
    =5.0 Volts)
    t
    SR
    I
    REF
    I
    REF
    20
    μ
    s
    7
    P Reference Supply current (Both ATD modules on)
    0.75
    mA
    8
    P Reference Supply current (Only one ATD module on)
    0.375
    mA
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