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        參數(shù)資料
        型號(hào): LTC1264-7CN#PBF
        廠商: Linear Technology
        文件頁(yè)數(shù): 5/16頁(yè)
        文件大?。?/td> 0K
        描述: IC FILTER 8TH ORDR LOWPASS 14DIP
        標(biāo)準(zhǔn)包裝: 25
        濾波器類(lèi)型: 線性相位,低通開(kāi)關(guān)電容器
        頻率 - 截止或中心: 200kHz
        濾波器數(shù): 1
        濾波器階數(shù): 8th
        電源電壓: ±2.37 V ~ 8 V
        安裝類(lèi)型: 通孔
        封裝/外殼: 14-DIP(0.300",7.62mm)
        供應(yīng)商設(shè)備封裝: 14-PDIP
        包裝: 管件
        LTC1264-7
        12647fa
        13
        U
        S
        A
        O
        PPLICATI
        WU
        U
        I FOR ATIO
        Aliasing
        Aliasing is an inherent phenomenon of sampled data
        systems and it occurs when input frequencies close to the
        sampling frequency are applied. For the LTC1264-7 case
        at 50:1, an input signal whose frequency is in the range of
        fCLK ±10%, will be aliased back into the filter’s passband.
        If, for instance, an LTC1264-7 operating with a 100kHz
        clock and 2kHz cutoff frequency receives a 95kHz 10mV
        input signal, a 5kHz 56
        VRMS alias signal will appear at its
        output. When the LTC1264-7 operates with a clock-to-
        cutoff frequency of 25:1, aliasing occurs at twice the clock
        frequency. Table 10 shows details.
        Table 10. Aliasing (fCLK = 100kHz)
        INPUT FREQUENCY
        OUTPUT LEVEL
        OUTPUT FREQUENCY
        (VIN = 1VRMS,
        (Relative to Input,
        (Aliased Frequency
        fIN = fCLK ± fOUT)
        0dB = 1VRMS)fOUT = ABS [fCLK ± fIN])
        (kHz)
        (dB)
        (kHz)
        25:1, fCUTOFF = 4kHz
        175 (or 225)
        –76
        25
        180 (or 220)
        – 69
        20
        185 (or 215)
        – 62
        15
        190 (or 210)
        – 43
        10
        195 (or 205)
        – 7
        5
        50:1, fCUTOFF = 2kHz
        75 (or 125)
        –96
        25
        80 (or 120)
        – 90
        20
        85 (or 115)
        – 82
        15
        90 (or 110)
        – 72
        10
        95 (or 105)
        – 45
        5
        99 (or 101)
        0
        1
        Table 9. Maximum VIN vs VS and Clock
        POWER SUPPLY
        MAXIMUM fCLK
        MAXIMUM VIN
        ±7.5V
        5.0MHz
        1.6VRMS (fIN ≥ 160kHz)
        4.5MHz
        2.0VRMS (fIN ≥ 160kHz)
        4.0MHz
        2.5VRMS (fIN ≥ 160kHz)
        ≥ 3.5MHz
        1.6VRMS (fIN ≥ 500kHz)
        ±5V
        3.0MHz
        1.6VRMS (fIN ≥ 100kHz)
        ≥ 3.0MHz
        0.7VRMS (fIN ≥ 500kHz)
        Single 5V
        2.0MHz
        0.5VRMS (fIN ≥ 400kHz)
        Transient Response
        2V/DIV
        INPUT = 10kHz
        ± 3V
        fCLK = 2.5MHz
        RATIO = 25:1
        INPUT
        90%
        50%
        10%
        OUTPUT
        tr
        td
        ts
        1164-7 F06
        RISE TIME (tr) =
        ±5%
        0.36
        fCUTOFF
        SETTLING TIME (ts) =
        ±5%
        (TO 1% of OUTPUT)
        2
        fCUTOFF
        TIME DELAY (td) = GROUP DELAY ≈
        (TO 50% OF OUTPUT)
        1.15
        fCUTOFF
        Figure 6
        Table 11. Transient Response of LTC Lowpass Filters
        DELAY
        RISE
        SETTLING OVER-
        TIME*
        TIME**
        TIME***
        SHOOT
        LOWPASS FILTER
        (SEC)
        (%)
        LTC1064-3 Bessel
        0.50/fC
        0.34/fC
        0.80/fC
        0.5
        LTC1164-5 Bessel
        0.43/fC
        0.34/fC
        0.85/fC
        0
        LTC1164-6 Bessel
        0.43/fC
        0.34/fC
        1.15/fC
        1
        LTC1264-7 Linear Phase
        1.15/fC
        0.36/fC
        2.05/fC
        5
        LTC1164-7 Linear Phase
        1.20/fC
        0.39/fC
        2.20/fC
        5
        LTC1064-7 Linear Phase
        1.20/fC
        0.39/fC
        2.20/fC
        5
        LTC1164-5 Butterworth
        0.80/fC
        0.48/fC
        2.40/fC
        11
        LTC1164-6 Elliptic
        0.85/fC
        0.54/fC
        4.30/fC
        18
        LTC1064-4 Elliptic
        0.90/fC
        0.54/fC
        4.50/fC
        20
        LTC1064-1 Elliptic
        0.85/fC
        0.54/fC
        6.50/fC
        20
        * To 50%
        ±5%, ** 10% to 90% ±5%, *** To 1% ±0.5%
        10
        s/DIV
        Figure 5
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