Embedded Dial-Up Modems
Controller-Based Modems
CSM92/34/32-SP Serial Modem with 4th
Generation SmartDAA and Speakerphone Support
CX93021-2x
Conexant’s portfolio includes a comprehensive suite of semiconductor
solutions for communications and consumer applications.
Controller-Based Modem with SmartDAA® 4 for
Embedded Applications
Conexant’s CX93021-2x Serial Modem device (CSM92/34/32-SP) is a full
controllered modem supporting V.92 data modulation, 14.4 kbps fax modem
operation, and remote Telephone Answering Machine (TAM) and speakerphone.
The modem also supports V.44/V.42bis/MNP 5 data compression for greater data
throughput and V.42 LAPM/MNP2-4 error correction protocol for increased data
integrity and reliability. The device set is ideal for embedded applications such
as Internet appliances, security systems, home/personal monitoring systems
and other applications that require robust dial-up connectivity and speakerphone
functionality.
The device set offers the smallest footprint consisting of a CX93021-2x V.92
Modem device in a 36-pin Quad Flat-No Lead (QFN), a CX20548 SmartDAA®
4 Line Side Device (LSD) in a 16-pin QFN, and a CX20452 Voice Codec in a
24-pin QFN. The CX93021-2x modem device integrates a Microcontroller Unit
(MCU), a Digital Signal Processor (DSP), internal RAM, internal ROM, and a
SmartDAA System Side Device (SSD) making it independent of host processor
and operating system. The device set has a serial interface and codec interface
for connection to the optional CX20452 Codec for speakerphone applications. It
is also available without the CX20452 Codec for no speakerphone support.
The CX93021-2x modem MCU/DSP performs the command processing, host
interface functions and telephone line signal modulation/demodulation, which
reduces the computational load on the host processor. The modem operates by
executing masked code from internal ROM. The modem features internal RAM
memory that enhances the modem’s flexibility. The modem’s internal RAM can
be used to load new country profiles, override existing country profiles or add
customized firmware code. An optional external serial NVRAM is supported.
The optional external NVRAM adds the convenience of permanent storage, just
like internal RAM, NVRAM can be used to store new country profiles, override
existing ones or add customized firmware code.
Conexant’s SmartDAA 4 line side device builds on three generations of market
leading silicon DAA devices. It eliminates the need for costly analog transformers,
relays and opto-isolators typically used in discrete DAA implementation for
country-specific modem configurations. It’s system-powered, making it the most
reliable and best performing silicon DAA in the market. The SmartDAA 4 LSD
also adds enhanced telephony extension features to the modem’s operation
and other functions such as Call Waiting detection, and Caller ID decoding.
Incorporating Conexant’s proprietary Digital Isolation Barrier (DIB) design and
other innovative DAA features, the SmartDAA 4 architecture simplifies application
design and minimizes layout area. The result is a worldwide reduced system cost
solution using a single bill of materials.
Combined with the optional Codec, the CX93021-2x modem supports Full-duplex
Speakerphone (FDSP) operation using microphone and speaker, as well as other
voice/TAM applications using handset or headset. Speakerphone Mode features
Distinguishing Features
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Controller-based modem, no external
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memory required
Optional Full Duplex Speakerphone with
AEC
Telephony/TAM support
V.92, V.34, V.32bis data modulations
V.17/V.29 Fax Class 1 and Fax Class 2
SIA Protocol and Contact ID
V.80 synchronous access mode, synchronous
and asynchronous DTE interface
V.44/V.42bis and MNP5 data compression
V.42 and MNP2-4 error correction
Call Waiting detection and Type II Caller ID
decoding during data mode
Type I Caller ID decoding
63 embedded and upgradeable country
profiles
Serial NVRAM interface for optional
permanent country profile storage
Embedded AT commands
Worldwide pre-tested reference design
Part Number
CX93021-2x
Description
CSM92/34/32-SP Serial Modem with
4th Generation SmartDAA and
Speakerphone Support
CONEXANT [ CONEXANT SYSTEMS, INC ]
