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XR-T56L85 Datasheet(PDF) 4 Page - Exar Corporation |
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XR-T56L85 Datasheet(HTML) 4 Page - Exar Corporation |
4 / 12 page XR-T56L85 4 Rev. 2.01 ABSOLUTE MAXIMUM RATINGS Supply Voltage +20V . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage Temperature -65 °C to 150°C . . . . . . . . . . . . . . SYSTEM DESCRIPTION The Receiver The incoming bipolar PCM signal, which is attenuated and distorted by the cable is applied to the receiver input, consisting of the RX DATA(+) and RX DATA(-) pins, either through a balanced transformer, a balanced capacitively coupled terminal or a single-ended coaxial cable (see Figure 5). A peak detector following the input generates a DC reference for the positive and negative threshold comparator (to extract the positive and negative data pulses). Information on the positive and negative data pulses is outputed as TTL compatible signals at pins RPOS and RNEG, respectively. More specifically, an output signal present at the RPOS pin indicates that a positive pulse was received at the RX DATA(+)/RX DATA(-) pins, from the incoming bipolar data stream. Likewise an output signal present at the RNEG pin indicates that a negative pulse was received at the RX DATA(+)/RX DATA(-) pins. This conversion from the bipolar signal to TTL compatible signals allows for digital processing of the clock and data signals by the terminal equipment. An example of the waveforms of the TTL compatible recovered clock and data as output by the receiver portion of the chip is presented in Figure 2, Figure 3 and Figure 5. A tank circuit tuned to the appropriate frequency is added externally to provide the appropriate frequency-selective filtering of the received clock signal. The Transmitter The transmitter portion of the chip receives TTL compatible signals and transmits a corresponding bipolar data stream down the line (See Figure 5). TPOS and TNEG are TTL compatible signals that dictate the polarity of the pulse to be generated and transmitted on the output bipolar data stream. Both TPOS and TNEG inputs are sampled by the rising edge of the transmit clock, TCLK. The TX DATA(+) and TX DATA(-) pins form a differential driver output, this is used to drive AMI data down the line via a transformer. The TX DATA(+) and TX DATA(-) pins are open-collector outputs. When a logic “high” signal is applied to the TPOS pin, a positive pulse (the positive portion of the bipolar data stream) will be transmitted to the line via the TX DATA(+) O/P and TX DATA(-) O/P pins. Likewise, when a logic “high” signal is applied to the TNEG pin, a negative pulse will be transmitted to the line via the TX DATA(+) and TX DATA(-) pins. An illustration of the key waveforms involved in this TTL to AMI conversion process, in the Transmitter portion of the chip is presented in Figure 4. |
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