CX06833-3x/4x SMXXD Modem Data Sheet
The Conexant SMXXD Modem is a full-featured, controller-based modem that
integrates modem controller (MCU), modem data pump (MDP), 256 KB ROM, 32 KB
RAM, and analog line interface codec functions into a single package.
The modem operates by executing firmware from internal ROM and RAM. Optional
customized firmware is supported with optional external flash ROM memory.
Additionally, added/modified country profiles are supported by internal SRAM patch
(maximum of one profile) or serial EEPROM. Downloadable architecture supports
downloading of customized MCU firmware from the host/DTE to the SMXXD modem.
The SMXXD Modem device set, consisting of a CX06833 modem device in a 144-pin
TQFP and an optional CX20442 Voice Codec (VC) in a 28-pin TQFP.
Low profile TQFP packages with reduced voltage operation and low power consumption
make this modem an ideal solution for embedded applications using parallel host or serial
The SMXXD Modem supports data rates up to V.92, data compression, error correction,
fax rates up to 14.4 kbps and speakerphone mode.
In V.92 and V.90 (V.92 models) data modes, the modem can receive data at speeds up to
56 kbps. In V.34 data mode (V.92 and V.34 models), the modem can receive data at
speeds up to 33.6 kbps. In V.32 bis data mode, the modem can receive data at speeds up
to 14.4 kbps.
Data compression (V.44/V.42bis/MNP5) and error correction (V.42/MNP 2-4) modes
are supported to maximize data throughput and data transfer integrity. Non-error-
correction mode is also supported.
Fax Group 3 send and receive rates are supported up to 14.4 kbps with T.30 protocol.
The SMXXD modem operates with PSTN telephone lines worldwide.
S models, using the optional CX20442 Voice Codec (VC) in a 32-pin TQFP, support
position independent, full-duplex speakerphone (FDSP) operation using microphone and
speaker, as well as other voice/TAM applications using handset or headset.
Table 1-1 lists the available models. A simplified device interface drawing is shown in
Figure 1-1. A functional interface drawing showing optional memory is shown in