CMX649

Adaptive Delta Modulation (ADM) Voice   Codec

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Features

• 64kb/s CVSD for Small-Cell Point-to-Point Digital Voice Communication
• Non Linear PCM: µ-Law and A-Law Modes
• Programmable Time Constants for ADM Codec
• 13-Bit Linear PCM Codec
• On-Chip 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)

Applications

• 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

Package Styles:

- CMX649D3  - CMX649E3

Supply Requirement:

2.7V power supply

Description
The CMX649 Adaptive Delta Modulation (ADM) Voice Codec provides full duplex codec functions optimized for cost effective, portable, wireless applications. Standard and lower cost digital voice applications are supported via selectable operating modes. Robust ADM coding (e.g. 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. Both external and internal codec sample clock sources are supported. Independent encoder and decoder powersave controls minimize 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.
The (Cordless Headset) ADM Voice Codec will support 2.7V to 5.5V operation and is provided in compact 20 pin SOIC and TSSOP packages.