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  • 參數(shù)資料
    型號: DC1562A-A
    廠商: Linear Technology
    文件頁數(shù): 5/30頁
    文件大?。?/td> 0K
    描述: BOARD EVAL LTC6990
    設計資源: DC1562A Design Files
    DC1562A Schematic
    特色產(chǎn)品: TimerBlox?
    標準包裝: 1
    系列: TimerBlox®
    主要目的: 計時,電壓控制振蕩器(VCO)
    嵌入式:
    已用 IC / 零件: LTC6990
    主要屬性: 1kHz ~ 10kHz 頻率范圍
    次要屬性: 2.25 V ~ 5.5 V 電源
    已供物品:
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    LTC6990
    13
    6990fc
    For more information www.linear.com/LTC6990
    OPERATION
    Changing DIVCODE After Start-Up
    Following start-up, the A/D converter will continue
    monitoring VDIV for changes. Changes to DIVCODE will
    be recognized slowly, as the LTC6990 places a priority on
    eliminating any “wandering” in the DIVCODE. The typical
    delay depends on the difference between the old and
    new DIVCODE settings and is proportional to the master
    oscillator period.
    tDIVCODE =16 (DIVCODE + 6) tMASTER
    A change in DIVCODE will not be recognized until it is
    stable, and will not pass through intermediate codes. A
    digital filter is used to guarantee the DIVCODE has settled
    to a new value before making changes to the output. Then
    the output will make a clean (glitchless) transition to the
    new divider setting.
    Start-Up Time
    When power is first applied to the LTC6990 the power-on
    reset (POR) circuit will initiate the start-up time, tSTART.
    The OUT pin is floated (high-impedance) during this time.
    The typical value for tSTART ranges from 0.5ms to 8ms
    depending on the master oscillator frequency (indepen-
    dent of NDIV):
    tSTART(TYP) = 500 tMASTER
    The start-up time may be longer if the supply or DIV
    pin voltages are not stable. For this reason, it is recom-
    mended to minimize the capacitance on the DIV pin so it
    will properly track V+.
    Figure 5. DIVCODE Change from 5 to 2
    Figure 6. Typical Start-Up
    100s/DIV
    6990 F05
    DIV
    1V/DIV
    OUT
    1V/DIV
    V+ = 3.3V
    RSET = 200k
    576s
    100s/DIV
    6990 F06
    V+
    1V/DIV
    OUT
    1V/DIV
    V+ = 2.5V
    DIVCODE = 4
    RSET = 50k
    OUTPUT CONNECTED
    TO 1.25V THROUGH 25k
    TO SHOW Hi-Z
    470s
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