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Davicom DM562AP Integrated Modem

DM562AP Integrated ModemThe Davicom DM562AP integrated modem is a two-chipset design that provides a complete solution for state of-the-art, voice-band Plain Old Telephone Switching (POTS) communication. The modem provides for Data (up to 56,000bps), Fax (up to ban0bps), Voice and Full Duplex Speaker-phone functions to comply with various international standards.

The design of the DM562AP is optimized for desktop personal computer applications, embedded microprocessor applications and Multi-Function Peripheral (MFP) FAX application. It provides a low cost, highly reliable, maximum integration, with the minimum amount of support required. The DM562AP modem can operate over a dial-up network (PSTN) or 2 wire leased lines. The modem integrates auto dial and answer capabilities, asynchronous data transmissions, serial and parallel interfaces, various tone detection schemes and data test modes.

The DM562AP modem reference design is preapproved for FCC part 68 and provides minimum design cycle time, with minimum cost to insure the maximum amount of success.

The simplified modem system, illustrates the basic interconnection between the MCU, DSP, AFE and other basic components of a modem. The individual elements of the DM562AP are:

  • DM6580 Analog Front End (AFE). 48-pin LQFP package
  • DM6588A ITU-T V.90 integrated Processors with 32K bytes SRAM built in 128-pin QFP package

DM562AP Integrated Modem Block Diagram


  • Data
    • ITU-T V.90 (56000 to 28000 bps)
    • ITU-T V.34 (33600 to 2400 bps)
    • ITU-T V.32bis (14400, 12000, 9600, 7200, 4800bps)
    • ITU-T V.32 (9600, 4800bps)
    • ITU-T V.22bis (2400, 1200bps)
    • ITU-T V.22 (1200bps)
    • ITU-T V.23 (1200/75bps)
    • ITU-T V.21 (300bps)
    • Bell 212A (1200bps)
    • Bell 103 (300bps)
  • Fax
    • ITU-T V.34 (33600 to 2400bps)
    • ITU-T V.17 (14400, 12000, 9600,7200bps)
    • ITU-T V.29 (9600, 7200bps)
    • ITU-T V.27ter (4800, 2400bps)
    • ITU-T V.21 Channel 2 (300bps)
    • Group III, Class 1
    • Support ECM mode
    • Automatic rate adaptation in V.34 halfduplex mode
  • Data Error Correction
    • MNP Class 4
    • ITU-T V.42 LAPM
  • Data Compression
    • MNP Class 5
    • ITU-T V.42bis
  • Voice compression
    • 4 bit ADPCM (ITU-T)
    • 2, 3 and 4 bit ADPCM (Davicom proprietary)
    • 8 Bit PCM
  • DTE Interface
    • DTE speed up to 115200bps
  • Enhanced “AT” command set and S registers
    • TIA/EIA 602, ITU V.25 ter AT command Set
    • TIA/EIA 602, ITU V.25 ter AT command Set
    • TIA/EIA 578 Fax Class 1 command set
    • TIA/EIA IS-101 Voice command set
  • Integrated UART 16550
  • Parallel (ISA/PCI) and Serial (UART) interfaces
    • 6, 7 and 8 bit character support
    • Even, odd, mark and none parity detection and generation
    • 1 and 2 stop bit support
    • Auto DTE data speed detection through “AT”
  • Support FSK Caller identification (Caller ID)
  • Speakerphone
  • Selectable world wide call progress tone detection
  • Enhanced 8032 compatible micro-controller
  • Power down mode
  • Access up to 256K bytes external program memory
  • Access up to 64K bytes external data memory
  • NVRAM to store two user configurable, selectable profiles with three programmable telephone  numbers
  • 32K bytes SRAM built in

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