MAX3084/MAX3085, and MAX3089 w" />
  • 參數(shù)資料
    型號: MAX3086EEPD+
    廠商: Maxim Integrated Products
    文件頁數(shù): 9/21頁
    文件大?。?/td> 0K
    描述: IC TXRX RS485/422 10MBPS 14-DIP
    產(chǎn)品培訓模塊: Lead (SnPb) Finish for COTS
    Obsolescence Mitigation Program
    標準包裝: 25
    類型: 收發(fā)器
    驅(qū)動器/接收器數(shù): 1/1
    規(guī)程: RS422,RS485
    電源電壓: 4.75 V ~ 5.25 V
    安裝類型: 通孔
    封裝/外殼: 14-DIP(0.300",7.62mm)
    供應商設備封裝: 14-PDIP
    包裝: 管件
    components with large amplitudes are evident. Figure
    15 shows the same signal displayed for a MAX3083/
    MAX3084/MAX3085, and MAX3089 with SRL = VCC),
    transmitting under the same conditions. Figure 15’s
    high-frequency harmonic components are much lower
    in amplitude, compared with Figure 14’s, and the poten-
    tial for EMI is significantly reduced. Figure 16
    shows the same signal displayed for a MAX3080/
    MAX3081/MAX3082, and MAX3089 with SRL = uncon-
    nected, transmitting under the same conditions. Figure
    16’s high-frequency harmonic components are even
    lower.
    In general, a transmitter’s rise time relates directly to the
    length of an unterminated stub, which can be driven with
    only minor waveform reflections. The following equation
    expresses this relationship conservatively:
    Length = tRISE / (10 x 1.5ns/ft)
    where tRISE is the transmitter’s rise time.
    For example, the MAX3080’s rise time is typically
    1320ns, which results in excellent waveforms with a stub
    length up to 90 feet. A system can work well with longer
    unterminated stubs, even with severe reflections, if the
    waveform settles out before the UART samples them.
    Fail-Safe, High-Speed (10Mbps),
    Slew-Rate-Limited RS-485/RS-422 Transceivers
    R
    B
    RECEIVER
    OUTPUT
    ATE
    A
    VID
    R
    Figure 13. Receiver Propagation Delay Test Circuit
    100kHz/div
    0Hz
    1MHz
    20dB/div
    MAX3080/3089
    FIG-14
    Figure 14. Driver Output Waveform and FFT Plot of
    MAX3086/MAX3087/MAX3088, and MAX3089 with
    SRL = GND, Transmitting a 20kHz Signal
    100kHz/div
    0Hz
    1MHz
    B
    A
    20dB/div
    MAX3080/3089
    FIG-15
    Figure 15. Driver Output Waveform and FFT Plot of
    MAX3083/MAX3084/MAX3085, and MAX3089
    with SRL = VCC, Transmitting a 20kHz Signal
    100kHz/div
    0Hz
    1MHz
    B
    A
    20dB/div
    MAX3080/3089
    FIG-16
    Figure 16. Driver Output Waveform and FFT Plot of
    MAX3080/MAX3081/MAX3082, and MAX3089
    with SRL = Unconnected, Transmitting a 20kHz Signal
    Maxim Integrated
    17
    MAX3080–MAX3089
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