CMX649
Adaptive Delta Modulation (ADM) Voice Codec
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Features:
Description
- CVSD for Digital Voice Communication
- Non Linear PCM: µ-Law
and A-Law Modes - Programmable Time Constants for ADM Codec
- 13-Bit Linear PCM Codec
- Programmable Anti-Alias and Anti-Image Filters
- Programmable Analogue Inputs and Outputs
- Clock and Data Recovery
- Wide Data-Rate Range: 16 to 128 kb/s
- Programmable Voice Activity Detector (VAD)
- Digital Cordless Headsets
- Personal Area Network (PAN) Voice Links
- Digital Cordless Telephone
- Wireless Digital PBX
- Full-Duplex Digital Radio Systems
- Time-Division Duplex (TDD) Systems
- Portable Digital Voice Communicators
- Voice Storage and Voice Delay
- CMX649D3 - 20-pin SOIC
- CMX649E3 - 20-pin TSSOP
- 2.7 to 5.5 V
The CMX649 Adaptive Delta Modulation (ADM) Voice Codec provides full duplex codec functions optimised for cost effective, portable, wireless applications. Standard and lower cost digital voice applications are supported via selectable operating modes. Robust ADM coding (CVSD) simplifies protocol and host software design by eliminating the forward error correction and framing protocols required by other codec algorithms.
Multiple codec sample/data rates are supported. Integrated filters reduce external components and adjust
to match the selected codec sample rate. The use of both external and internal codec sample clock sources
is supported.
Independent encoder and decoder powersave controls minimise power for half duplex wireless links.
Baseband interfaces to microphone, loudspeaker, host µC and RF transceiver circuits do not require external transcoders or complex voice frame transfer protocols.
Block Diagram
