Brief Description
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. @ 3.0V/5.0V
     • 3.0V to 5.5V Operation
     • Powersave Mode

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