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DP83907 bảng dữ liệu(PDF) 18 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện DP83907
Giải thích chi tiết về linh kiện  AT/LANTIC??II
PDF  70 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83907 bảng dữ liệu(HTML) 18 Page - National Semiconductor (TI)

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40 Functional Description (Continued)
Transmitter
The transmitter consists of four signals the true and compli-
ment Manchester encoded data (TXOg) and these signals
delayed by 50 ns (TXOdg)
These four signals are resistively combined TXOa with
TXOdb and TXOb with TXOda This is known as digital
pre-emphasis and is required to compensate for the twisted
pair cable which acts like a low pass filter causing greater
attenuation to the 10 MHz (50 ns) pulses of the Manchester
encoded waveform than the 5 MHz (100 ns) pulses
An example of how these signals are combined is shown in
the following diagram
TLF12082 – 10
FIGURE 15 Typical Summed Transmit Waveform
The signal with pre-emphasis shown above is generated by
resistively combining TXOa and TXOdb This signal along
with its compliment is passed to the transmit filter
TLF12082 – 11
FIGURE 16a Circuitry to Connect DP83907 to Twisted Pair Cable with External Filter
18



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