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DP83907 データシート(PDF) 18 Page - National Semiconductor (TI) |
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DP83907 データシート(HTML) 18 Page - National Semiconductor (TI) |
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18 / 70 page  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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