Embedded Dial-Up Modems

Controller-Based Modems

Conexant’s portfolio includes a comprehensive suite of semiconductor

solutions for communications and consumer applications.

Distinguishing Features

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

CSM92/34/32-SP Serial Modem with 4th

Generation SmartDAA and Speakerphone Support

CX93021-2x

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