Features: • Modulations and protocols
− ITU-T V.92
Modem-on-Hold (MOH)
Quick connect (QC)
PCM upstream
− V.90/V.34/V.32bis/V.32
− V.22bis/V.22/V.23/V.21
− V.23 reverse, V.23 half-duplex
− Bell 212A/Bell 103
− V.29 FastPOS
− V22bis fast connect
− V.80 Synchronous Access Mode
• Data compression
− V.44/V.42bis/MNP5
• Error correction
− V.42/MNP 4/MNP 2
• Call Waiting (CW) detection
• Type I and Type II Caller ID (CID) decoding
• DTE/host interface
− Serial DTE interface
− Parallel 16550 UARTcompatible host interface (38-pin version)
− Direct Mode
− Synchronous Mode
− Asynchronous Mode (Continued on Page 2)Application• Set top boxes
• Point-of-Sale terminals
• ATM machines
• Metering terminals
• Video game consoles
• Internet appliancesDescriptionThe 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.
SCXV.34 Data Sheet
