Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
xr XRT83D10
SINGLE CHANNEL DS1/CEPT LINE INTERFACE UNIT
JULY 2004 REV. 1.0.3
GENERAL DESCRIPTION
The XRT83D10 is a fully integrated, single channel,
Line Interface Unit (Transceiver) for 75 Ω or 120 Ω E1
(2.048 Mbps) and 100Ω DS1 (1.544 Mbps)
applications. The LIU consists of a receiver with
adaptive data slicer for accurate data and clock
recovery and a transmitter which accepts 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.
The XRT83D10 uses the transformer coupling on
both the Receiver and Transmitter sides, and
supports both 120Ω balanced,75Ω unbalanced and
100Ω interfaces.
FEATURES
• Complete E1 (CEPT) and DS1 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 ,120 Ω and
100 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
• -
40°C to 85°C Temperature Range
• Low Power Dissipation
• +5V or +3.3V Supply Operation
• Pin Compatible with AGERE T7290A and T5290A
APPLICATIONS
• PDH Multiplexers
• SDH Multiplexers
• Digital Cross-Connect Systems
• DECT (Digital European Cordless Telephone) Base
Stations
• CSU/DSU Equipment
F
IGURE 1. BLOCK DIAGRAM OF THE XRT83D10
EXCLK
TAOS
EC1
EC2
EC3
MODE1
MODE2
LOOPA
LOOPB
CS
V
DDA
, GND
A
V
DDD
, GND
D
Peak
Detector
Data
Slicer
Data &
Timing
Recovery
Timing
Generator
DLOS
Jitter
Attenuator
Digital
Loopback
LP3
Local
Loopback
LP1
Transmit
Monitor
Loss of
Clock
Pulse
Equalizer
Remote
Looback
LP2
TAOS
Tx Line
Driver
MODE2
TAOS
+
CLKLOS
2
EXCLK
JA
Clock
TSC
2
2
2
2
2
2
2
2
EXCLK
Local
Remote
Digital
TAOS
EC1
EC2
EC3
MODE1
MODE2
4
Decode
RLOS
EXCLK
RPDATA
RNDATA
RCLK
FOFS
TPDATA
TNDATA
TCLK
Transmit
Data
Receive
Data
ALOS
SCLK
DLOS
ICT
µP
Interface
MODE1
MODE2
RTIP
RRING
TTIP
TRING
