NRND

TP3404

www.ti.com

SNOS703 – DECEMBER 2004

TP3404 Quad Digital Adapter for Subscriber Loops (QDASL)

Check for Samples: TP3404

1

FEATURES

DESCRIPTION

The TP3404 is a combination 4-line transceiver for

23

•

4 COMPLETE ISDN PBX 2-WIRE DATA

voice

and

data

transmission

on

twisted

pair

TRANSCEIVERS INCLUDING:

subscriber

loops,

typically

in

PBX

line

card

•

Quad 2 B Plus D Channel Interface for PBX

applications.

It

is

a

companion

device

to

the

“U” Interface

TP3401/2/3 DASL single-channel transceivers. In

addition to 4 independent transceivers, a time-slot

•

144 kb/s Full-Duplex on 1 Twisted Pair Using

assignment circuit is included to support interfacing to

Burst Mode Transmission Technique

the system backplane.

•

Loop Range up to 6 kft (#24AWG)

Each QDASL line operates as an ISDN “U” Interface

•

Alternate Mark Inversion Coding with Transmit

for short loop applications, typically in a PBX

Pulse Shaping DAC, Smoothing Filter, and

environment, providing transmission for 2 B channels

Scrambler for Low Emi Radiation

and 1 D channel.

•

Adaptive Line Equalizer

Full-duplex transmission at 144 kb/s is achieved on

•

On-Chip Timing Recovery, No External

single

twisted

wire

pairs

using

a

burst-mode

Components

technique (Time Compression Multiplexed). All timing

•

Programmable Time-Slot Assignment TDM

sequences necessary for loop activation and de-

Interface for B Channels

activation are generated on-chip.

•

Separate Interface for D Channel with

Alternate Mark Inversion (AMI) line coding is used to

Programmable Sub-Slot Assignment

ensure low error rates in the presence of noise with

lower emi radiation than other codes such as Biphase

•

4.096 MHz Master Clock

(Manchester). On #24 AWG cable the range is at

•

4 Loop-Back Test Modes

least 1.8 km (6k ft.).

•

MICROWIRE™ Compatible Serial Control

Interface

•

5V Operation

•

28-Pin PLCC Package

BLOCK DIAGRAM

1

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.

2

MICROWIRE is a trademark of Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.