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| 型號： | XRT82D20IWTR-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 1/27頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LIU E1 SGL 28SOJ |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 線路接口裝置（LIU） |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | E1 |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-BSOJ |
| 供應(yīng)商設(shè)備封裝： | 28-SOJ |
| 包裝： | 帶卷 (TR) |
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com
XRT82D20
SINGLE CHANNEL E1 LINE INTERFACE UNIT
AUGUST 2006
REV. 1.0.8
GENERAL DESCRIPTION
The XRT82D20 is a fully integrated, single channel,
Line Interface Unit (Transceiver) for 75
or 120 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
transformers on both the Receiver and Transmitter
sides, and supports both 120
balanced and 75
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 and 120
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 or
160mW with 75
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
Line
Driver
TClk
TPOS
TNEG
RClk
RPOS
RNEG
TTIP
TRing
RLOS
RTIP
RRing
MClk
Timing
Generator
Jitter Attenuator
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