參數(shù)資料
    型號(hào)： MT8885AE
    廠商： Mitel Networks Corporation
    英文描述： Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface
    中文描述： 綜合DTMFTransceiver與掉電
    文件頁(yè)數(shù)： 8/20頁(yè)
    文件大?。?/td> 350K
    代理商： MT8885AE
    MT8885
    Advance Information
    4-58
    Table 2. Actual Frequencies Versus Standard
    Requirements
    Distortion Calculations
    The MT8885 is capable of producing precise tone
    bursts with minimal error in frequency (see Table 2).
    The internal summing amplifier is followed by a first-
    order lowpass switched capacitor filter to minimize
    harmonic components and intermodulation products.
    The total harmonic distortion for a single tone can be
    calculated using Equation 1, which is the ratio of the
    total power of all the extraneous frequencies to the
    power of the fundamental frequency expressed as a
    percentage.
    Equation 1. THD (%) For a Single Tone
    The Fourier components of the tone output
    correspond to V
    2f
    .... V
    nf
    as measured on the output
    waveform. The total harmonic distortion for a dual
    tone can be calculated using Equation 2. V
    L
    and V
    H
    correspond to the low group amplitude and high
    group amplitude, respectively and V
    2
    IMD
    is the sum
    of all the intermodulation components. The internal
    switched-capacitor filter following the D/A converter
    keeps distortion products down to a very low level as
    shown in Figure 10.
    Equation 2. THD (%) For a Dual Tone
    ACTIVE
    INPUT
    OUTPUT FREQUENCY (Hz)
    %ERROR
    SPECIFIED
    697
    770
    852
    941
    1209
    1336
    1477
    1633
    ACTUAL
    699.1
    766.2
    847.4
    948.0
    1215.9
    1331.7
    1471.9
    1645.0
    L1
    +0.30
    -0.49
    -0.54
    +0.74
    +0.57
    -0.32
    -0.35
    +0.73
    L2
    L3
    L4
    H1
    H2
    H3
    H4
    THD (%) = 100
    V
    fundamental
    V
    2
    2f
    + V
    2
    3f
    + V
    2
    4f
    + .... V
    2
    nf
    V
    2L
    +
    V
    2H
    V
    22L
    +
    V
    23L
    + ....
    V
    2nL
    +
    V
    22H
    +
    V
    23H
    + ..
    V
    2nH
    +
    V
    2IMD
    THD (%) = 100
    DTMF Clock Circuit
    The internal clock circuit is completed with the
    addition of a standard television colour burst crystal
    having a resonant frequency of 3.579545 MHz. A
    number of MT8885 devices can be connected as
    shown in Figure 11 such that only one crystal is
    required. Alternatively, the OSC1 inputs on all
    devices can be driven from a TTL buffer with the
    OSC2 outputs left unconnected.
    Figure 11 - Common Crystal Connection
    Microprocessor Interface
    The MT8885 design incorporates an adaptive
    interface, which allows it to be connected to various
    kinds of microprocessors. Key functions of this
    interface include the following:
    Continuous activity on DS/RD is not necessary
    to update the internal status registers.
    senses whether input timing is that of an Intel or
    Motorola controller by monitoring the
    DS (RD),
    R/W (WR) and CS inputs.
    generates equivalent CS signal for internal
    operation for all processors.
    differentiates between multiplexed and non-
    multiplexed microprocessor buses. Address
    and data are latched in accordingly.
    compatible with Motorola and Intel processors.
    Figure 16 shows the timing diagram for Motorola
    microprocessors with separate address and data
    buses. Members of this microprocessor family
    include 2 MHz versions of the MC6800, MC6802 and
    MC6809. For the MC6809, the chip select (CS) input
    signal is formed by NANDing the (E+Q) clocks and
    address decode output. For the MC6800 and
    MC6802, CS is formed by NANDing VMA and
    address decode output. On the falling edge of CS,
    the internal logic senses the state of data strobe
    MT8885
    OSC1
    OSC2
    MT8885
    OSC1
    OSC2
    MT8885
    OSC1
    OSC2
    3.579545 MHz
    相關(guān)PDF資料
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    參數(shù)描述
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    MT8885AN1 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 24SSOP - Rail/Tube
    MT8885ANR 制造商:Microsemi Corporation 功能描述:
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