14 FN7491.5 August 28, 2012 Power Supply Bypassing and Printed Circuit Board Layout As with any high frequency device, a good pr" />

    參數(shù)資料
    型號(hào): EL5178ISZ
    廠商: Intersil
    文件頁數(shù): 6/17頁
    文件大小: 0K
    描述: IC DRVR TWISTED SGL 700MHZ 8SOIC
    標(biāo)準(zhǔn)包裝: 97
    放大器類型: 差分
    電路數(shù): 1
    輸出類型: 差分
    轉(zhuǎn)換速率: 850 V/µs
    增益帶寬積: 350MHz
    -3db帶寬: 700MHz
    電流 - 輸入偏壓: 14µA
    電壓 - 輸入偏移: 1900µV
    電流 - 電源: 12.5mA
    電流 - 輸出 / 通道: 100mA
    電壓 - 電源,單路/雙路(±): 4.75 V ~ 11 V,±2.38 V ~ 5.5 V
    工作溫度: -40°C ~ 85°C
    安裝類型: 表面貼裝
    封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
    供應(yīng)商設(shè)備封裝: 8-SOIC
    包裝: 管件
    EL5178, EL5378
    14
    FN7491.5
    August 28, 2012
    Power Supply Bypassing and Printed Circuit
    Board Layout
    As with any high frequency device, a good printed circuit board
    layout is necessary for optimum performance. Lead lengths should
    be as short as possible. The power supply pin must be well bypassed
    to reduce the risk of oscillation. For normal single supply operation,
    where the VS- pin is connected to the ground plane, a single 4.7F
    tantalum capacitor in parallel with a 0.1F ceramic capacitor from
    VS+ to GND will suffice. This same capacitor combination should be
    placed at each supply pin to ground if split supplies are to be used.
    In this case, the VS- pin becomes the negative supply rail.
    For good AC performance, parasitic capacitance should be kept
    to a minimum. Use of wire-wound resistors should be avoided
    because of their additional series inductance. Use of sockets
    should also be avoided if possible. Sockets add parasitic
    inductance and capacitance that can result in compromised
    performance. Minimizing parasitic capacitance at the amplifier's
    inverting input pin is very important. The feedback resistor
    should be placed very close to the inverting input pin. Strip line
    design techniques are recommended for the signal traces.
    As the signal is transmitted through a cable, the high frequency
    signal will be attenuated. One way to compensate this loss is to
    boost the high frequency gain at the receiver side.
    Typical Applications
    FIGURE 35. TWISTED PAIR CABLE RECEIVER
    FIGURE 36. TRANSMIT EQUALIZER
    FBP
    RG
    RF
    IN+
    IN-
    REF
    FBN
    RF
    RFR
    RGR
    IN+
    IN-
    REF
    EL5175/
    EL5375
    EL5178/
    EL5378
    VO
    50
    RT
    TWISTED PAIR
    ZO = 100Ω
    VO+
    FBP
    RF
    IN+
    IN-
    REF
    FBN
    RF
    VO-
    RG
    RT
    RGC
    CL
    75
    fL
    fH
    FREQUENCY
    GAIN
    (dB)
    f
    H
    1
    2
    πR
    GC CC
    -----------------------------
    f
    L
    1
    2
    πR
    GCC
    -------------------------
    DC Gain
    1
    2R
    F
    R
    G
    -----------
    +
    =
    HF
    ()Gain
    1
    2R
    F
    R
    G
    R
    GC
    ||
    --------------------------
    +
    =
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