The CMX639 is a Continuously Variable Slope Delta Modulation (CVSD) full duplex CODEC for use in consumer and commercial digital voice communication systems. With its robust and selectable coding algorithms, low cost, very low power, and small size, the CMX639 is ideal for use in a wide variety of consumer and business digital voice applications. Its completely integrated CODEC simplifies design and eliminates the costs, complexity and risk of external filters and software algorithms.

FEATUREs
• Single Chip Full Duplex CVSD CODEC
    Integrated Input and Output Filters
    Robust Coding for Wireless Links
    Programmable Sampling Clocks
    3 and 4 bit Companding Algorithms
• Low Power / Small Size for Portable Devices
    1.9mA/2.75mA typ. @ 3V/5V
    3.0V to 5.5V Operation
Powersave Mode

APPLICATIONs
• Consumer & Business Handheld Devices
• Digital Voice Appliances
    Spread Spectrum Wireless
    Cordless Phones
    Voice Recording & Storage
    Delay Lines
• Time Domain Scramblers
• Multiplexers and Switches