CMX639D4

Product 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.

8kbps to 128kbps data/sampling clock rates are supported both via external clock signals or internally generated, programmable clocks. Internal data/sampling clocks are derived from an on-chip reference oscillator that uses an external clock crystal. An internal data/sampling clock output signal is provided to synchronize external circuits, if desired. Multiplexer applications are also well supported by the encoder outputs three-state/high impedance enable feature.

The CMX639 operates from 2.7V to 5.5V supplies and is available in the following packages: 24-pin TSSOP (CMX639E2) and 16-pin SOIC (CMX639D4).

Features

• Single Chip Full Duplex CVSD codec
• Integrated Input and Output Filters
• Robust Coding for Wireless Links
• Robust Coding for Wireless Links
• Programmable Sampling Clocks
• 3 and 4 bit Companding Algorithms
• Low Power/Small Size for Portable Devices
• 3.0V to 5.5V Operation
• 1.9mA/2.75mA typ. @ 3.0V/5.0V
• Powersave Mode