XRT82D20

www.DataSheet4U.com áç APRIL 2001 XRT82D20 SINGLE CHANNEL E1 LINE INTERFACE UNIT REV. 1.0.7 GENERAL DESCRIPTION The XRT82D20 is a fully integrated, single channel, Line Interface Unit (Transceiver) for 75 Ω or 120 Ω E1 (2.048 Mbps) applications. The LIU consists of a receiver with adaptive data slicer for accurate data and clock recovery and a transmitter which accepts either single or dual-rail digital inputs for signal transmission to the line using a low- impedance differential line driver. The LIU also includes a crystalless jitter attenuator for clock and data smoothing which, depending on system requirements, can be selected in either the transmit or receive path. Coupling the XRT82D20 to the line requires transformers on both the Receiver and Transmitter sides, and supports both 120 Ω balanced and 75 Ω unbalanced interfaces. The receiver can be capacitive coupled to for cost reduction FEATURES Complete E1 (CEPT) line interface unit Generates transmit output pulses that are compliant with the ITU-T G.703 Pulse Template for 2.048Mbps (E1) rates On-Chip Pulse Shaping for both 75 Ω and 120 Ω Line Drivers FIGURE 1. BLOCK DIAGRAM OF THE XRT82D20 Clock Recovery and Selectable Crystal-less Jitter attenuator Compliant with ETS300166 Return Loss Compliant with the ITU-T G.823 Jitter Tolerance Requirements Remote, Local and Digital Loop backs Declares and Clears LOS per ITU-T G.775 Logic Inputs accept either 3.3V or 5.0V levels - 400C to 850C Temperature R...