SKYWORKS SI2439-A-FM

The Si2494/39 ISOmodem is a full-featured ITU V.92/V.34-compliant modem that provides connect rates of up to 56 kbps, full-duplex, over the public switched telephone network (PSTN). Offered as a chipset with the Si2494/39 system-side device and the Si3018 line-side device, the ISOModem utilizes patented direct access arrangment (DAA) technology to provide a programmable telephone line interface with an unparalleled level of integration. This compact solution eliminates the need for a separate DSP, modem controller, codec, transformer, relay, opto-isolators, clocking crystal, and 2-4 wire hybrid. The addition of the Si3000 voice codec supports a voice handset and/or full-duplex speakerphone. Voice pass-through with optional compression supports tapeless answering machine, music-on-hold, voice menus, etc. The Si2494/39 is ideal for embedded modem applications due to its flexibility, small footprint, and minimal external component count.

• Data modem formats: ITU-T, Bell
• 300 bps up to 56 kbps
• V.21, V.22, V.29 Fast Connect
• V.44, V.42, V.42bis, MNP2 - 5
• Automatic rate negotiation
• V.92 PCM upstream
• V.92 Quick connect
• V.92 Modem on hold
• Type I and II caller ID decode
• No external ROM or RAM required
• UART, SPI, or parallel interface
• Flexible clock options:
  • Low-cost 32.768 kHz oscillator
  • 4.915 MHz oscillator
  • 27 MHz clock input
• Integrated DAA:
  • Over 6000 V capacitive isolation
  • Parallel phone detect
  • Globally-compliant line interface
  • Overcurrent detection
• AT command set support
• SMS / MMS support
• Firmware upgradeable

• Point-of-sale terminals
• Security