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Электронный компонент: CX06827

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V.92 Single-Chip ACF Modem with
Optional CX20437 Voice Codec
Conexant's CX06827 single-chip V.92 modem device set
enables modem designers to develop modems for desktop
PCs and Internet appliances. Features available with V.92 are
quick connect, PCM upstream and modem-on-hold. The new
V.44 standard is also supported. This new data-compression
protocol delivers data rates faster than those achieved by the
V.42 bis protocol. The device set supports analog data at up to
56 Kbps, analog fax at up to 14.4 Kbps, telephone answering
machine (TAM)/telephony extensions and voice/speakerphone
(optional), and parallel/serial host interface operation,
depending on the model.
V.92 Features
Quick Connect
This feature approximates the "always on" connection of
broadband access solutions by enabling dial-up modems to
complete the modem handshake sequence 30% to 40% faster
than before.
PCM Upstream
Using a new modulation for upstream data (a variation of PCM),
V.92 supports a maximum upstream data rate of 48 Kbps, as
compared to 33.6 Kbps for V.90. At the maximum rate, this
represents a 40% improvement in upstream throughput. Users
will also see throughput improvements when uploading digital
audio and image files.
Modem-on-Hold
Call waiting is a popular feature offered by many telephone
companies around the world. Unfortunately, a call-waiting
event may disconnect a modem when it is in use, frustrating
the user and often prompting a call to the OEM or ISP support
center. Modem-on-hold allows the modem to remain online
during a call-waiting event, thereby eliminating the need to
redial to get back on the Internet.
D i s t i n g u i s h i n g F e a t u r e s
V.92 features: modem-on-hold, quick
connect and PCM upstream
V.44 data-compression protocol increases
data rates faster than those achieved by
the V.42 bis protocol
Hardware-based modem controller
digital signal processor (DSP)
C X 0 6 8 2 7
p e r s o n a l c o m p u t i n g p r o d u c t s
f e a t u r e s a n d s p e c i f i c a t i o n s
ITU-T data modem - V.92
- ITU-T V.90/K56flex, V.34, V.32 bis, V.32,
V.22 bis, V.22, V.23, and V.21; Bell 212A
and Bell 103
- V.44, V.42 bis and MNP 5
data compression
- V.42 LAPM and MNP 2-4
error correction
- V.250 and V.251 commands
Fax modem send and receive
rates up to 14.4 Kbps
- V.17, V.29, V.27 ter, and V.21 channel 2
- EIA/TIA 578 Class 1 and T.31 Class 1.0,
and EIA/TIA 578 Class 2 commands
Downloadable architecture
- Downloadable MCU firmware
from the host/DTE to flash ROM
- Downloadable MDP code modules
from the MCU transparent to the host
Worldwide operation
- Complies with TBR21 and
other country requirements
- Caller ID detection
- Call progress, blacklisting
- External ROM/flash ROM includes
default values for 29 countries
Caller ID and distinctive ring detect
Telephony/TAM
- V.253 commands
- 2-bit and 4-bit Conexant ADPCM, 8-bit
linear PCM, and 4-bit IMA coding
- 8 KHz sample rate
- Concurrent DTMF, ring,
and Caller ID detection
Full-duplex speakerphone (FDSP)
mode using optional CX20437 voice
codec (S models)
- Microphone and speaker interface
- Telephone handset
or headset interface
- Acoustic and line echo cancellation
- Microphone gain and muting
- Speaker volume control and muting
Built-in host/DTE interface
- Parallel 16550A UART-compatible
interface
- Serial ITU-T V.24 (EIA/TIA-232-E)
logical interface
Direct mode (serial DTE interface)
Flow control and speed buffering
Automatic format/speed sensing
Serial async/sync data;
parallel async data
Thin packages support low-profile
designs (1.6 mm max. height)
- CX06827 ACF: 144-pin TQFP
- CX20437 VC: 32-pin TQFP
(for S models only)
+3.3V operation with +5V-tolerant
digital inputs
Typical power use
- SCFACF: 274 mW (Normal Mode);
28 mW (Sleep Mode)
- VC: 5 mW (Normal Mode)
Available in V.34 and
V.32 bis modems in
pin-compatible packages
Applications
Desktop modems
Remote monitoring and
data collection systems
Stand-alone TAM/fax machines
Set-top boxes
Internet appliances
Because the modem features external firmware,
modem designers can update and customize
firmware code as needed.
In TAM mode, enhanced 2- or 4-bit-per-sample coding
schemes at a sample rate of 8 kHz provide flexible
format compatibility and allow efficient digital storage
of voice/audio. Also supported are 8-bit linear and IMA
4-bit ADPCM coding. This mode supports applications
such as digital TAM, voice annotation, and recording
from and playback to the telephone line.
The speakerphone option (S models), includes a CX20437
voice codec (VC) in a 32-pin TQFP. This option supports
position-independent, full-duplex speakerphone (FDSP)
operation using microphone and speaker, as well as other
voice/TAM applications using handset or headset.
www.conexant.com
General Information:
U.S. and Canada: (800) 854-8099
International: (949) 483-6996
Headquarters Newport Beach
4311 Jamboree Rd, P.O. Box C
Newport Beach, CA 92660-3095
Order# E-101390C
01-0358
2001, Conexant Systems, Inc. All Rights Reserved.
Conexant and the Conexant logo are trademarks
of Conexant Systems, Inc. Other trademarks are
owned by their respective owners. Although Conexant
strives for accuracy in all its publications, this material
may contain errors or omissions and is subject to
change without notice.
THIS MATERIAL IS PROVIDED AS IS
AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE AND NON-INFRINGEMENT.
Conexant shall not be
liable for any special, indirect, incidental or consequential
damages as a result of its use.
Product Features