CX86500 - SCXV.92/V.34/V.32bis Modem / Controller-based Modem with Worldwide SmartDAA 3 Line Side Device for Embedded Applications - Conexant Systems, Inc
The Conexant SCXV.92, SCXV.34, and SCXV.32bis modems are worldwide operational
modem device sets for embedded applications that support modulations up to V.92,
V.34, and V.32bis, respectively. All modems also support V.44/V.42bis/MNP 5 data
compression for greater data throughput, V.42 LAPM/MNP2-4 error correction protocol
for increased data integrity and reliability.
The SCXV.92/V.34/V.32bis device set consists of a modem device and a SmartDAA 3
Line Side Device (LSD). The modem device integrates a microcontroller (MCU), a digital
signal processor (DSP), and a SmartDAA system side device (SSD) onto a single die
(Figure 1). The modem is available in 28-pin or 38-pin TSSOP versions. The 28-pin
version is for serial interface applications (Figure 2) and is footprint-compatible with the
CX84100 (SCXV.22bis) and CX81801-9x (SmartV.XX) modem devices. The 38-pin
version is for serial (Figure 3) or parallel (Figure 4) interface applications (interface type
selectable by an I/O pin). Major hardware interfaces are illustrated in Figure 1.
Conexant’s SmartDAA technology used in the SmartDAA 3 LSD eliminates the need for
bulky analog transformers, relays, and opto-isolators typically used in discrete DAA
implementations. The SmartDAA 3 LSD operates without drawing power from the phone
line, unlike line-powered DAAs, and is therefore not subject to variations in line voltage
conditions. The SmartDAA 3 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 architecture simplifies application design
and minimizes layout area to reduce design cost. The SmartDAA 3 LSD is available in a
28-pin Quad Flat No-lead (QFN) package or in a 32-pin Low Profile Quad Pack (LQFP)
package.
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 by
the 38-pin version. 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.
Small, low-profile packages, reduced voltage operation, and low power consumption
make this device set an ideal solution for embedded applications
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