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XRT5683A Datasheet(PDF) 4 Page - Exar Corporation |
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XRT5683A Datasheet(HTML) 4 Page - Exar Corporation |
4 / 12 page XR-T5683A 4 Rev. 2.01 ELECTRICAL CHARACTERISTICS (CONT’D) Parameters Min. Typ. Max. Unit Conditions AC Electrical Characteristics (Cont’d) Transmitter Section Pulse Width at 8.448MHz 53 65 ns Measured at Pin 13 & 15, See Figure 6 Output Rise Time 12 25 ns See Figure 5 Output Fall Time 12 25 ns See Figure 5 Output Pulse Imbalance 2.5 ns At 50% Output Level Specifications are subject to change without notice Notes Bold face parameters are covered by production test and guaranteed over operating temperature range. ABSOLUTE MAXIMUM RATINGS Supply Voltage +20V . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage Temperature -65 °C to +150°C . . . . . . . . . . . . . . SYSTEM DESCRIPTION The incoming bipolar PCM signal which is attenuated and distorted by the cable is applied to the threshold comparator and the peak detector. The peak detector generates a DC reference for the threshold comparator for data and clock extraction. An external tank circuit tuned to the appropriate frequency is added for the later operation. The clock signal, data (+) and data (-) all go through a similar level shifter to be converted into TTL level to be compatible for digital processing. In the transmit direction, the output drivers consist of two identical TTL inputs with open collector output stages. The maximum low level current these output stages can sink is 40mA. With full width data (NRZ) applied to the inputs together with a synchronized clock, the output will generate a bipolar signal when driving a center-tapped transformer. A block diagram of the XR-T5683A is shown in Figure 1. The clock recovery uses an external tank circuit. The receive data will create an excitation for the tank circuitry which in turn will create a recovered, received clock (RCLK). |
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Similar Description - XRT5683A |
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