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XRT82D20 Datasheet(PDF) 1 Page - Exar Corporation

Part # XRT82D20
Description  SINGLE CHANNEL E1 LINE INTERFACE UNIT
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT82D20 Datasheet(HTML) 1 Page - Exar Corporation

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Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com
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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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