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  • 參數(shù)資料
    型號: LT1460CCMS8-101460
    廠商: LINEAR TECHNOLOGY CORP
    元件分類: 基準(zhǔn)電壓源/電流源
    英文描述: 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 10 V, PDSO8
    封裝: PLASTIC, MSOP-8
    文件頁數(shù): 10/24頁
    文件大?。?/td> 509K
    代理商: LT1460CCMS8-101460
    LT1460
    18
    1460f
    APPLICATIO S I FOR ATIO
    WU
    U
    Input Capacitance
    It is recommended that a 0.1F or larger capacitor be
    added to the input pin of the LT1460. This can help with
    stability when large load currents are demanded.
    Output Accuracy
    Like all references, either series or shunt, the error budget of
    the LT1460-2.5 is made up of primarily three components:
    initial accuracy, temperature coefcient and load regulation.
    Line regulation is neglected because it typically contrib-
    utes only 30ppm/V, or 75V for a 1V input change. The
    LT1460-2.5 typically shifts less than 0.01% when soldered
    into a PCB, so this is also neglected (see PC Board Layout
    section). The output errors are calculated as follows for a
    100A load and 0°C to 70°C temperature range:
    LT1460AC
    Initial accuracy = 0.075%
    For IO = 100A, and using the LT1460-2.5 for calculation,
    V
    ppm
    mA
    V
    OUT =
    ()(
    )=
    3500
    01
    25
    875
    ..
    which is 0.035%.
    For temperature 0°C to 70°C the maximum ΔT = 70°C,
    V
    ppm
    C
    CV
    mV
    OUT =
    °
    °
    ()( )=
    10
    70
    25
    175
    ..
    which is 0.07%.
    Total worst-case output error is:
    0.075% + 0.035% + 0.070% = 0.180%.
    Table 1 gives worst-case accuracy for the LT1460AC, CC,
    DC, FC, GC from 0°C to 70°C and the LT1460BI, EI, GI
    from –40°C to 85°C.
    Note that the LT1460-5 and LT1460-10 give identical ac-
    curacy as a fraction of their respective output voltages.
    PC Board Layout
    In 13- to 16-bit systems where initial accuracy and tem-
    perature coefcient calibrations have been done, the me-
    chanical and thermal stress on a PC board (in a cardcage
    for instance) can shift the output voltage and mask the
    true temperature coefcient of a reference. In addition,
    the mechanical stress of being soldered into a PC board
    can cause the output voltage to shift from its ideal value.
    Surface mount voltage references (MS8 and S8) are the
    most susceptible to PC board stress because of the small
    amount of plastic used to hold the lead frame.
    A simple way to improve the stress-related shifts is to
    mount the reference near the short edge of the PC board,
    or in a corner. The board edge acts as a stress boundary,
    or a region where the exure of the board is minimum.
    The package should always be mounted so that the leads
    absorb the stress and not the package. The package is
    generally aligned with the leads parallel to the long side
    of the PC board as shown in Figure 16a.
    A qualitative technique to evaluate the effect of stress on
    voltage references is to solder the part into a PC board and
    Table 1. Worst-Case Output Accuracy Over Temperature
    IOUT
    LT1460AC
    LT1460BI
    LT1460CC
    LT1460DC
    LT1460EI
    LT1460FC
    LT1460GC
    LT1460GI
    LT1460HC
    LT1460JC
    LT1460KC
    0
    0.145%
    0.225%
    0.205%
    0.240%
    0.375%
    0.325%
    0.425%
    0.562%
    0.340%
    0.540%
    0.850%
    100A
    0.180%
    0.260%
    0.240%
    0.275%
    0.410%
    0.360%
    0.460%
    0.597%
    0.380%
    0.580%
    0.890%
    10mA
    0.325%
    0.405%
    0.385%
    0.420%
    0.555%
    0.505%
    0.605%
    0.742%
    0.640%
    0.840%
    1.15%
    20mA
    0.425%
    N/A
    0.485%
    0.520%
    N/A
    0.605%
    0.705%
    N/A
    0.540%
    0.740%
    1.05%
    相關(guān)PDF資料
    PDF描述
    LT1460GCZ-2.5#TRPBF1460 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PBCY3
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    LT1460CCMS8-2.51460 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PDSO8
    LT1460EIS8-5#TRPBF1460 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 5 V, PDSO8
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