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    參數(shù)資料
    型號: ACS8944T
    廠商: Semtech
    文件頁數(shù): 6/24頁
    文件大?。?/td> 0K
    描述: IC JITTER ATT MULT PLL 48-QFN
    標(biāo)準(zhǔn)包裝: 1
    類型: 時(shí)鐘/頻率發(fā)生器,多路復(fù)用器
    PLL:
    主要目的: SONET/SDH
    輸入: LVPECL
    輸出: LVPECL
    電路數(shù): 1
    比率 - 輸入:輸出: 1:1
    差分 - 輸入:輸出: 是/是
    頻率 - 最大: 155.52MHz
    電源電壓: 3.135 V ~ 3.465 V
    工作溫度: -40°C ~ 85°C
    安裝類型: 表面貼裝
    封裝/外殼: 48-VFQFN 裸露焊盤
    供應(yīng)商設(shè)備封裝: 48-QFN(7x7)
    包裝: 管件
    ADVANCED COMMUNICATIONS
    FINAL
    DATASHEET
    Revision 3/November 2006 Semtech Corp.
    Page 14
    www.semtech.com
    ACS8944 JAM PLL
    Input and Output Interface Terminations
    Interfacing to either the same type or electrically different
    interface types is illustrated by the following circuit
    diagrams, covering translation from LVDS to LVPECL.
    The example of Figure 12 shows LVPECL to LVPECL
    terminations with D.C. coupling, so that the ACS8944
    sees an equivalent load of around 50
    from the R3, R4,
    R5, R6 resistor arrangement at the receiver end.
    Figure 12 LVPECL Output - DC Coupled to LVPECL or LVDS
    Receiver
    The preferred termination circuitry for the LVDS signals
    between the ACS8525/26/27 and the ACS8944 LVPECL
    is shown in Figure 13. The bias for the LVPECL input is set
    for A.C. inputs at a mid point of approximately 2 V (with a
    3.3 V VDD), as opposed to a normal D.C. coupled bias of
    VDD - 2 V. This is due to the push-pull nature of an A.C.
    coupled signal.
    Figure 13 Generic LVDS - AC Coupled to LVPECL Receiver
    Input/Output Timing
    Figure 14 Timing Diagrams
    F8944D_015LVPECL2LVPECL_03
    ACS8944 or similar
    LVPECL/LVDS receiver
    OUTP
    OUTN
    Transmission Line
    130R
    82R
    130R
    82R
    These resistors may
    be integrated on-chip
    VDD
    ASC8944 or similar
    LVPECL Output
    VDD
    VSS
    VDD -1.0 V
    OUTP
    VDD -1.4 V
    VDD -1.8 V
    Time
    F8944D_017LVDS2LVPECL_02
    GND
    VDD
    R5
    2K7
    R1
    100
    R3
    4K3
    R4
    4K3
    C2
    220nF
    C1
    220nF
    R2
    2K7
    LVDS
    Output
    Device
    OUTN
    OUTP
    JAM PLL
    CLKN
    CLKP
    Transmission
    Line Impedance
    50 Ohms
    LVPECL
    INPUT
    1) Input to Output
    Delay
    2) Power-up Sequence
    CLKX
    t
    PDIO
    OUTY
    VDD
    (90% VDD)
    Input frequency must be within 400 ppm of nominal
    before releasing reset
    Start of Frequency
    Tuning Algorithm
    F8944D 021IP OPTi i g 01
    t
    RPW
    t
    FT
    RESETB
    CLKX
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