CMX608 Datasheet, PDF (1/70 Pages) CML Microcircuits – Integrated Input and Output Channel Filters

CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CMX608/CMX618/
CMX638
RALCWI Vocoders
D/608_18_38/11 September 2014
Features
 Near Toll Quality RALCWI Coding Algorithm
 Multiple Bit Rate Modes:
 2400 or 2750 bps
 3600 bps with FEC Enabled
 4-bit Viterbi Soft Decision Decoding
 Integrated Audio CODEC (CMX618/CMX638 only)
 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
 1.8V Low Power Operation, 3.3V Tolerant I/O
 Small 48-pin LQFP and VQFN Packages
Applications
Provisional Issue
 Digital PMR, LMR, Voice Radio
 Digital Trunking
 DMR TDMA
 DMR FDMA, dPMR
 Digital Voice Scrambling and Encryption
 Digital WLL
 Voice Storage and Playback Systems
 Regenerative Digital Voice Repeaters
 Messaging Systems
 VoIP Systems
 Voice Pagers
 Half-Duplex Vocoding (CMX608/CMX618)
 Full-Duplex Vocoding (CMX638 only)
1. Brief Description
The CMX608/CMX618/CMX638 are flexible, high integration, high performance, RALCWI (Robust
Advanced Low Complexity Waveform Interpolation) Vocoders, offering near toll quality voice at very low bit
rates. A Forward Error Correction (FEC) engine provides optimum performance in real life applications.
The RALCWI Vocoder comprises four independent functions which are selectable by the host: Voice
Encoder, FEC Encoder, Voice Decoder and FEC Decoder. The CMX608 and CMX618 are half-duplex
Vocoders and the CMX638 is a full-duplex Vocoder with integrated voice CODEC.The CMX618 includes
an integrated voice CODEC, offering a complete analogue voice to low bit rate vocoded data function, with
integrated channel filters removing the need for external components, whereas the CMX608 requires an
external voice CODEC.
CMX608/CMX618/CMX638 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.
Continued overleaf .....
 2014 CML Microsystems Plc