LXT307
Low-Power E1 Integrated Short-Haul Transceiver
Datasheet
The LXT307 is a fully integrated low-power transceiver optimized for G.703 2.048 Mbps (E1)
applications. It features a constant low output impedance transmitter allowing for high
transmitter return loss. Transmit pulse amplitudes are selectable for various cable types. It is
designed to exceed the latest international specifications, including G.775 and ETS 300 166.
The LXT307 is microprocessor controllable through a serial interface. It can also be controlled
through individual pins in Hardware Mode.
The LXT307 offers a variety of diagnostic features, including transmit and receive monitoring.
The device requires a single 2.048 MHz clock reference for the on chip high performance clock
recovery system. It uses an advanced double-poly, double-metal CMOS process and requires
only a single 5-volt power supply.
Applications
Product Features
s
PCM G.703 Interfaces
s
E1 multiplexer
s
Digital Access and Cross-connect Systems
(DACS)
s
G.703 Trunk line cards for Public
Switching Systems and PABX
s
High-speed data transmission lines
s
Low power dissipation 260 mW typical
s
Constant low output impedance transmitter
regardless of data pattern (3
typical)
s
Low speed reference clock to reduce PC
board noise coupling
s
Driver short circuit current limited to 50
mA per
OFTEL/BABT recommendations
s
75/120
operation without component
changes
s
Transmit and receive return loss exceeds
ETSI ETS 300 166 and G.703
s
Meets or exceeds all ITU specifications
including G.703, G.823 (03/93) and G.775
s
Compatible with most popular PCM
framers
s
Line driver, data recovery and clock
recovery functions
s
Minimum receive signal of 500 mV
s
Programmable transmit amplitude for 75
and 120
operation without component
changes
s
Local and remote loopback functions
s
Transmit performance monitor with DPM
detecting single line shorts for improved
reliability
s
Analog/digital LOS monitor per G.775
s
Receiver jitter tolerance 0.4 UI from 40
kHz to 100 kHz
s
Serial control interface
s
Available in 28-pin DIP or PLCC
As of January 15, 2001, this document replaces the Level One document
Order Number: 249069-001
LXT307 -- Low-Power E1 Integrated Short-Haul Transceiver.
January 2001
Datasheet
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The NAME OF PRODUCT may contain design defects or errors known as errata which may cause the product to deviate from published
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Copyright Intel Corporation, 2001
*Third-party brands and names are the property of their respective owners.
Datasheet
3
Low-Power E1 Integrated Short-Haul Transceiver -- LXT307
Contents
1.0
Pin Assignment and Signal Description
........................................................... 6
2.0
Functional Description
............................................................................................. 9
2.1
Power Requirements............................................................................................. 9
2.2
Reset Operation .................................................................................................... 9
2.3
Receiver ................................................................................................................ 9
2.4
Loss of Signal Processor..................................................................................... 10
2.4.1
Declaring the LOS Condition .................................................................. 10
2.4.2
Clearing the LOS Condition.................................................................... 10
2.5
Transmitter .......................................................................................................... 10
2.5.1
Line Code ...............................................................................................10
2.6
Driver Performance Monitor ................................................................................ 11
2.7
Operating Modes................................................................................................. 12
2.7.1
Hardware Mode Operation .....................................................................12
2.7.2
Host Mode Control ................................................................................. 12
2.7.2.1 Serial Input Word....................................................................... 12
2.7.2.2 Serial Output Word .................................................................... 13
2.7.3
Interrupt Handling................................................................................... 13
2.7.4
Diagnostic Mode Operation .................................................................... 17
2.7.4.1 Transmit All Ones ...................................................................... 17
2.7.4.2 Local Loopback ......................................................................... 17
2.7.4.3 Remote Loopback .....................................................................18
3.0
Application Information
.........................................................................................19
3.1
E1 Coaxial Applications....................................................................................... 20
3.2
Line Protection .................................................................................................... 21
4.0
Test Specifications
.................................................................................................. 23
5.0
Mechanical Specifications
.................................................................................... 29
LXT307 -- Low-Power E1 Integrated Short-Haul Transceiver
4
Datasheet
Figures
1
LXT307 Block Diagram ......................................................................................... 5
2
LXT384 Pin Assignments and Package Markings ................................................ 6
3
50% AMI Coding ................................................................................................. 11
4
LXT307 SIO Write Operation .............................................................................. 14
5
LXT307 SIO Read Operation .............................................................................. 15
6
LXT307 Interrupt Handling .................................................................................. 16
7
TAOS .................................................................................................................. 17
8
TAOS with LLOOP .............................................................................................. 17
9
LLOOP ................................................................................................................ 18
10
RLOOP................................................................................................................ 18
11
LXT307 120 W Application (Hardware Mode)..................................................... 20
12
Line Interface for E1 Coax Applications .............................................................. 21
13
2.048 Mbps Pulse Mask Template ...................................................................... 25
14
LXT307 Receive Clock Timing ............................................................................ 26
15
LXT307 Transmit Clock Timing ........................................................................... 26
16
LXT307 Serial Data Input Timing Diagram ......................................................... 27
17
LXT307 Serial Data Output Timing Diagram....................................................... 28
18
Typical Receiver Input Jitter Tolerance (Loop Mode) ......................................... 28
19
Plastic DIP Specifications ................................................................................... 29
20
PLCC Package Specifications ............................................................................ 30
Tables
1
Pin Assignments and Signal Descriptions............................................................. 7
2
G.775 Requirements and LXT307 Implementation of LOS Detection ................ 11
3
Equalizer Control Inputs for Pulse Amplitude Selection ...................................... 11
4
CLKE Settings..................................................................................................... 13
5
SIO Input Bit Settings (See
Figure 4
) .................................................................. 13
6
Serial Data Output Bit Coding ............................................................................. 14
7
Transformer Specifications ................................................................................. 21
8
Transformer Selection Guide .............................................................................. 21
9
75 W Output Combinations ................................................................................. 22
10
120 W Output Combinations ............................................................................... 22
11
Absolute Maximum Ratings ................................................................................ 23
12
Recommended Operating Conditions and Characteristics ................................. 23
13
Electrical Characteristics (Over Recommended Operating Conditions) ............. 23
14
Analog Characteristics (Over Recommended Operating Conditions) ................. 24
15
Receive Timing Characteristics (Over Recommended Operating Conditions) ... 25
16
Transmit Timing Characteristics (Over Recommended Operating Conditions) .. 26
17
Serial I/O Timing Characteristics (Over Recommended Operating Conditions) . 27
Low-Power E1 Integrated Short-Haul Transceiver -- LXT307
Datasheet
5
Figure 1. LXT307 Block Diagram
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