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MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

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by MC145422/D

Universal Digital-Loop

Transceivers (UDLT)

The MC145422 and MC145426 UDLTs are high鈥搒peed data transceivers

that provide 80 kbps full鈥揹uplex data communication over 26 AWG and larger

twisted鈥損air cable up to two kilometers in distance. Intended primarily for use in

digital subscriber voice/data telephone systems, these devices can also be

used in remote data acquisition and control systems. These devices utilize a

256 kilobaud modified differential phase shift keying burst modulation technique

for transmission to minimize RFI/ EMI and crosstalk. Simultaneous power

distribution and duplex data communication can be obtained using a single

twisted鈥損air wire.

These devices are designed for compatibility with existing, as well as

evolving, telephone switching hardware and software architectures.

The UDLT chip鈥搒et consists of the MC145422 Master UDLT for use at the

telephone switch linecard and the MC145426 Slave UDLT for use at the remote

digital telset and/or data terminal.

The devices employ CMOS technology in order to take advantage of their

reliable low鈥損ower operation and proven capability for complex analog/digital

LSI functions.

鈥?/div>

Provides Full鈥揇uplex Synchronous 64 kpbs Voice/Data Channel and Two

8 kbps Signaling Data Channels Over One 26 AWG Wire Pair Up to Two

Kilometers

鈥?/div>

Compatible with Existing and Evolving Telephone Switch Architectures and

Call Signaling Schemes

鈥?/div>

Automatic Detection Threshold Adjustment for Optimum Performance Over

Varying Signal Attenuations

鈥?/div>

Protocol Independent

鈥?/div>

Single 5 V Power Supply

鈥?/div>

22鈥揚in PDIP, 24鈥揚in SOG Packages

鈥?/div>

Application Notes AN943, AN949, AN968, AN946, and AN948

MC145422 Master UDLT

鈥?/div>

Pin Controlled Power鈥揇own and Loopback Features

鈥?/div>

Signaling and Control I/O Capable of Sharing Common Bus Wiring with

Other UDLTs

鈥?/div>

Variable Data Clock 鈥?64 kHz to 2.56 MHz

鈥?/div>

Pin Controlled Insertion/Extraction of 8 kbps Channel into LSB of 64 kbps

Channel for Simultaneous Routing of Voice and Data Through PCM Voice

Path of Telephone Switch

MC145426 Slave UDLT

鈥?/div>

Compatible with MC145500 Series PCM Codec鈥揊ilters

鈥?/div>

Pin Controlled Loopback Feature

鈥?/div>

Automatic Power鈥揢p/Power鈥揇own Feature

鈥?/div>

On鈥揅hip Data Clock Recovery and Generation

鈥?/div>

Pin Controlled 500 Hz D3 or CCITT Format PCM Tone Generator for

Audible Feedback Applications

MC145422

MC145426

22

1

P SUFFIX

PLASTIC DIP

CASE 708

24

1

DW SUFFIX

SOG PACKAGE

CASE 751E

ORDERING INFORMATION

MC145422P

MC145426P

Plastic DIP

MC145422DW SOG Package

MC145426DW SOG Package

REV 2

9/95

漏

Motorola, Inc. 1995

MOTOROLA

MC145422鈥C145426

1

MC145426

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