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XR-T56L22AN Datasheet(PDF) 6 Page - Exar Corporation |
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XR-T56L22AN Datasheet(HTML) 6 Page - Exar Corporation |
6 / 16 page XR-T56L22 6 Rev. 1.02 ELECTRICAL CHARACTERISTICS (CONT’D) Parameter Pin Min. Typ. Max. Unit Conditions Clock Output Stage Output Pulse Rise Time (Tr) 11 40 ns 1 Output Pulse Fall Time (Tf) 11 40 ns Output Pulse Width (Tw) 11 224 264 ns Shunt Regulator Output Voltage 12 4.85 5.1 5.35 V Pin 13, 14 floating Voltage Regulation Over Temp. 12 -0.02 %/ °C Pin 13, 14 floating Load Regulation 12 0.027 %/mA 1mA to 100mA load Note 1 Using a 2K pull up resistor between 11 and VCC and 15pF capacitance to GND. ABSOLUTE MAXIMUM RATINGS Storage Temperature -65 °C to 150°C . . . . . . . . . . . . . . Operating Temperature -40 °C to 85°C . . . . . . . . . . . . . Supply Voltage -0.5 to 7V . . . . . . . . . . . . . . . . . . . . . . . . Supply Voltage Surge (10ms) 25V . . . . . . . . . . . . . . . . . Data Output Voltage (pin 9, 10) 12V . . . . . . . . . . . . . . . SYSTEM DESCRIPTION With reference to the functional block diagram, the basic operation of the XR-T56L22 may be described as follows: The received bipolar signal, is applied to a linear amplifier and automatic equalizer. These circuits provide the necessary amount of gain and phase equalization to recover the transmitted data, and band limit the signal, to optimize repeater performance for near-end crosstalk produced by other systems operating within the same cable bundle. The preamplifier output signals which are balanced and of opposite phase, are applied to the clock extraction and pulse regenerator circuits. Here they are rectified and then applied to a high Q resonant circuit which extracts the 1.544/2.048 Mbps frequency component from the received signal. This signal is then sliced and fed to an adjustable phase shift circuit. A second slicer is used to control the time at which the output signals from the preamplifier are sampled by the pulse regenerator circuits. The phase shifted clock signal is made available as an output from the circuit for interface applications. The clock phase adjustment is performed with a single pin using an external resistor. Adjustment of the position of the clock sampling edge by the phase shift circuit allows performance of the pulse regenerator to be optimized. The pulse regenerator performs the sampling and data slicing to regenerate the appropriate output pulse. These pulses are applied to an external output transformer to create the bipolar signal that drives the next section of twisted pair. |
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