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20437 Datasheet - Conexant

Part Name
Description
MFG CO.
20437
Conexant
Conexant Systems Conexant
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V.90/K56flex/V.34/V.32bis Modem Device Sets with Microcontroller (L2702), Modem Data Pump (P9373), SmartDAA(20463), and Optional Voice Codec (20437) for Low Power Applications

General Description
The SmartACFL device set, comprised of separate microcontroller (MCU), modem data pump (MDP), and line side device (LSD) devices, provides the processing core for a complete modem design. The optional Voice Codec (VC) supports voice/full-duplex speakerphone (FDSP) operation with interfaces to a microphone and speaker and to a telephone handset/headset (S models). The S model can also be ordered with an RCDSVD Speech Codec Processor (SCP) in a 100-pin PQFP to support DSVD.
Modem operation, including dialing, call progress, telephone line interface, telephone handset interface, voice/speakerphone interface, and host interface functions are supported and controlled through the V.250, V.251, and V.253-compatible command set.
The modem hardware connects to the host via a parallel, serial, or PC Card interface. The OEM adds discrete components as required by the modem model and the application to complete the system (Table 1). These components may include a crystal circuit, EEPROM, DIB components, telephone line interface, optional voice/speakerphone interface, and optional cellular/GSM interface.

Detailed Features
General Modem Features
• Downloadable Architecture
− Downloadable MCU firmware from the host/DTE
− Downloadable MDP code modules from the MCU, transparent to the host
• V.90 data modem with receive rates up to 56k bps and send rates up to V.34 rates
− ITU-T V.90, K56flex, V.34 (33.6 kbps), V.32 bis, V.32, V.22 bis, V.22, V.23, and V.21; Bell 212A
and 103
− V.42 LAPM and MNP 2-4 error correction
− V.42 bis and MNP 5 data compression
− MNP 10EC™ enhanced cellular performance
− V.250 (ex V.25 ter) and V.251 (ex V.25 ter Annex A) commands
• V.22 bis fast connect
• Analog cellular direct connect
• GSM direct connect
• V.17 fax modem with send and receive rates up to 14.4 kbps
− ITU-T V.17, V.29, V.27 ter, and V.21 ch. 2
− EIA/TIA 578 Class 1 and T.30 Class 1.0 commands
• V.80 synchronous access mode supports host controlled communication protocols with H.324
interface support
• Data/Fax/Voice call discrimination
• Hardware-based modem controller
• Worldwide operation
− US/Japan/Canada/TBR21 and other countries
− Caller ID and distinctive ring detection
− Call progress, blacklisting
• Telephony/TAM
− V.253 commands
− 8-bit µ-Law/A-Law coding (G.711)
− 8-bit/16-bit linear coding
− 8 kHz sample rate
− Concurrent DTMF, ring, and Caller ID detection
• Full-duplex speakerphone mode (S models)
− Microphone and speaker interface
− Telephone handset or headset interface
− Acoustic and line echo cancellation
− Microphone gain and muting
− Speaker volume control and muting
• PC Card interface (MCUP only) supports two functions with programmable I/O and window size
• JTAG Boundary Scan support
• Built-in host/DTE interface with speeds up to 230.4 kbps
− Parallel 16550A UART-compatible interface(MCU)
− Serial ITU-T V.24 (EIA/TIA-232-E) (MCU)
− PC Card (MCUP)
• Flow control and speed buffering
• Automatic format/speed sensing
• Serial sync/async data; parallel async data
• Sleep mode
• Thin packages support low profile designs (1.6 mm max. height)
• MCU (L2702): 128-pin TQFP
• MDP (P9373): 100-pin TQFP
• LSD (20463): 32-pin TQFP
• VC (20437): 32-pin TQFP

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