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XRT82D20 Datasheet(PDF) 1 Page - Exar Corporation |
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XRT82D20 Datasheet(HTML) 1 Page - Exar Corporation |
1 / 27 page Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com áç áç áç áç XRT82D20 SINGLE CHANNEL E1 LINE INTERFACE UNIT APRIL 2001 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 crystal- less 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 trans- formers on both the Receiver and Transmitter sides, and supports both 120 Ω balanced and 75 Ω unbal- anced interfaces. The receiver can be capacitive coupled to for cost reduction FEATURES • Complete E1 (CEPT) line interface unit • Generates transmit output pulses that are compli- ant 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 • 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 Range • Low Power Dissipation; 145mW with 120 Ω or 160mW with 75 Ω typical • +3.3V or +5V Supply Operation • Pin Compatible with the XRT7288 APPLICATIONS • PDH Multiplexers • SDH Multiplexers • Digital Cross-Connect Systems • DECT (Digital European Cordless Telephone) Base Stations • CSU/DSU Equipment • Test Equipment FIGURE 1. BLOCK DIAGRAM OF THE XRT82D20 HDB3 Encoder Peak Detector Local Loopback LOS Detect Data Slicer Data & Timing Recovery Remote Loopback HDB3 Decoder Digital Loopback Tx Pulse Shaper MUX MUX Line Driver TClk TPOS TNEG RClk RPOS RNEG TTIP TRing RLOS RTIP RRing MClk Timing Generator Jitter Attenuator |
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