TP3404_14 Datasheet, PDF (1/19 Pages) Texas Instruments – TP3404 Quad Digital Adapter for Subscriber Loops (QDASL)

NRND
TP3404
www.ti.com
SNOS703 – DECEMBER 2004
TP3404 Quad Digital Adapter for Subscriber Loops (QDASL)
Check for Samples: TP3404
FEATURES
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•23 4 COMPLETE ISDN PBX 2-WIRE DATA
TRANSCEIVERS INCLUDING:
• Quad 2 B Plus D Channel Interface for PBX
“U” Interface
• 144 kb/s Full-Duplex on 1 Twisted Pair Using
Burst Mode Transmission Technique
• Loop Range up to 6 kft (#24AWG)
• Alternate Mark Inversion Coding with Transmit
Pulse Shaping DAC, Smoothing Filter, and
Scrambler for Low Emi Radiation
• Adaptive Line Equalizer
• On-Chip Timing Recovery, No External
Components
• Programmable Time-Slot Assignment TDM
Interface for B Channels
• Separate Interface for D Channel with
Programmable Sub-Slot Assignment
• 4.096 MHz Master Clock
• 4 Loop-Back Test Modes
• MICROWIRE™ Compatible Serial Control
Interface
• 5V Operation
• 28-Pin PLCC Package
DESCRIPTION
The TP3404 is a combination 4-line transceiver for
voice and data transmission on twisted pair
subscriber loops, typically in PBX line card
applications. It is a companion device to the
TP3401/2/3 DASL single-channel transceivers. In
addition to 4 independent transceivers, a time-slot
assignment circuit is included to support interfacing to
the system backplane.
Each QDASL line operates as an ISDN “U” Interface
for short loop applications, typically in a PBX
environment, providing transmission for 2 B channels
and 1 D channel.
Full-duplex transmission at 144 kb/s is achieved on
single twisted wire pairs using a burst-mode
technique (Time Compression Multiplexed). All timing
sequences necessary for loop activation and de-
activation are generated on-chip.
Alternate Mark Inversion (AMI) line coding is used to
ensure low error rates in the presence of noise with
lower emi radiation than other codes such as Biphase
(Manchester). On #24 AWG cable the range is at
least 1.8 km (6k ft.).
BLOCK DIAGRAM
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
MICROWIRE is a trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004, Texas Instruments Incorporated