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CML Micro CMX618 & CMX638 RALCWI™ Vocoder ICs

CML Micro CMX618 and CMX638 RALCWI™ Vocoder ICs are flexible, high integration, high performance, digital voice products, offering near toll-quality voice at very low bit rates. The CMX618 is a half-duplex vocoder, and the CMX638 is full-duplex. Both devices feature an integrated voice CODEC, offering a complete analog voice to low bit rate vocoded data functions, with integrated channel filters removing the need for external components. A Forward Error Correction (FEC) engine provides optimum performance in real-life applications. These devices operate from a dual power supply (1.8V and 3.3V) and are available in both 48-pin LQFP (L4) and 48-pin VQFN (Q3) packages.

Features

  • RALCWI digital voice technology
  • Near toll quality RALCWI coding algorithm
  • No royalty/license fee
  • Multiple bit-rate modes
    • 2400bps or 2750bps
    • 3600bps with FEC enabled
  • 4-bit Viterbi soft decision decoding
  • Integrated voice codec
  • Integrated input and output channel filters
  • 20ms, 40ms, 60ms, and 80ms packet lengths
  • No licensing or royalty payments
  • Ancillary audio functions
    • Voice activity detector
    • Comfort noise generator
    • DTMF and single-tone regeneration
  • Voice store/retrieve, encryption/noise gate, fine analog output gain, and function add-ins available
  • Voice activity detector, DTMF/tone generator, comfort noise generator, and soft decision decoding

Applications

  • Digital PMR, LMR, DMR TDMA, DMR FDMA, dPMR
  • Digital trunking, digital WLL
  • Digital-voice scrambling and encryption
  • Voice storage and playback systems
  • Messaging systems
  • VoIP systems
  • Voice pagers
  • Regenerative digital voice repeaters

Specifications

  • 1.7V to 1.9V supply voltage range
  • 17.5mA operating supply current
  • 1.6MHz to 12MHz Xtal frequency range
  • 9.6MHz to 24MHz external clock frequency range
  • Maximum total allowable power dissipation at +25°C
    • 1600mW for 48-pin LQFP package
    • 1750mW for 48-pin VQFN package
  • -40°C to +85°C operating temperature range

Block Diagram

Block Diagram - CML Micro CMX618 & CMX638 RALCWI™ Vocoder ICs

Application Notes

Related Products

CML Micro Digital Voice Interface ICs

Devices providing voice-data generation, coding, transcoding, & decoding for digital communications.

Learn Moreom CML Micro Digital Voice Interface ICs View Productsrelaterat till CML Micro Digital Voice Interface ICs
Publicerad: 2019-11-19 | Uppdaterad: 2023-08-04