CMX649E3

Product Description

The CMX649 Adaptive Delta Modulation (ADM) Voice Codec provides full duplex ADM, companded (µ/A_x0002_law) PCM and linear PCM codec and transcoder functions for cost effecive, low power, wireless voice applications. Selectable modes and algorithms support many requirements. Robust ADM coding (e.g. CVSD) reduces host protocol and software burdens, eliminating forward error correction, framing protocols and algorithm processing. Dual transcode/decode mode supports multichannel applications.

Integrated filter responses adjust independently of 16kbps to 128kbps codec data rates. Codec sample clocks are externally applied or internally generated. High performance analog interfaces and sidetone include digital gain controls. Encoder and decoder voice activity detectors support powersaving.

The CMX649 ADM Voice Codec supports 2.7V to 5.5V operation and is available in 20-pin SOIC (D3) and TSSOP packages (E3) packages

Features

• Multiple Codec Modes, 16 to 128 kbps
• Full duplex ADM and CVSD
• Full duplex PCM: µ-law, A-law, Linear
• Full duplex PCM: µ-law, A-law, Linear
• Configurable ADM time constants
• Dual channel transcoder/decoder mode
• Data Clock Recovery
• Programmable Voice Activity Detector (VAD)
• Programmable Digital Scrambler
• Flexible Interfaces - 8-bit and 16-bit burst data with sync strobe - 1 bit serial data with clock