Advance Product Note
Jan ua ry 2000
LU97—AC-Link Soft Modem Chip Se t
Features
■
Operating system support:
—
Windows
* 95, 98, 2000
— PC ‘99 compliant
— ACPI compliant
■
High-speed data mode capabilities:
— ITU-T V.90 data rates 28000 bits/s—
56000 bits/s
†
— Ultrahigh compression throughput due to paral-
lel access directly to the host PC
— ITU-T V.34 e xtended rates: 33600 bits/s—
2400 bits/s V.32terbo, V.32bis, and fallbacks
— TIA/
EIA
§
602 standard for AT command set
— V.42 error correction (LAPM and
MNP
‡
)
— V.42bis and
MNP
Class 5 data compression
■
FAX mode capabilities:
— ITU-T V.17, V.29, V.27ter, and V.21 Ch 2
— TIA/
EIA
578 Class 1 FAX
■
Video-ready modem interface (VRM) V.80
■
Complete DAA includes the following:
— AC‘97/MC‘97 2.1 compliant
— International line interface
— Compliant with FCC, CTR21, JATE, and other
PTTs
— 3.3 V to 5 V power supply
— 2400 V isolation
— Integrated ring detector
— Integrated analog front end (AFE)
— 2-wire to 4-wire hybrid
— Low-power standby mode
— Low-profile SOIC packages
■
Applications:
— Modem riser cards
— Mobile daughter cards
*
Windows
and
Windows NT
are registered trademarks of
Microsoft Corporation.
†Actual speeds over U.S. telephone lines vary and are less than
56K, due to current FCC regulations and lin e conditions.
‡
MNP
is a registered trademark of Microcom, Inc.
§
EIA
is a registered trademark of Electronic Industries Associa-
tion.
Introduction
The Lucent Technologies LU97 chip set is an inte-
grated direct access arrangement (DAA) chip set that
provides a low-cost, isolated, silicon-based MC‘97
compliant interface to the telephone line. The chip set
saves cost and board area by eliminating the need
for a modem AFE or serial codec. It also eliminates
the need for an isolation transformer, relays, optoiso-
lators, and a 2-wire to 4-wire hybrid. The LU97 chip
set complies with AC‘97/MC‘97 Interface Specifica-
tion Rev. 2.1.
The chip set is fully programmable to meet worldwide
telephone line interface requirements, including
those described by CTR21, JATE, FCC, and various
country-specific PTT specifications. The programma-
ble parameters of the LU97 chip set include ac termi-
nation, dc termination, ringer impedance, and ringer
threshold. The LU97 chip set has been designed to
meet stringent worldwide requirements for out-of-
band energy, billing-tone immunity, lightning surges,
and safety requirements.
The LU97 chip set achieves an isolation barrier
through low-cost, high-voltage capacitors in conjunc-
tion with Lucent’s proprietary signal processing tech-
niques. These techniques eliminate any signal
degradation due to capacitor mismatches, common-
mode interference, or noise coupling. All transmit,
receive, control, and ring detect data are communi-
cated through this barrier.
The LU97 chip set is available in two 16-pin small
outline packages with an AC‘97 interface on the
CSP1037 and a telephone line interface on the
CSP1037A/B. The CSP1037A is designed for
domestic DAAs, while the CSP1037B is for interna-
tional DAAs.