CMX639P6 package discontinued CMX639 CML Microcircuits Consumer / Commercial COMMUNICATION SEMICONDUCTORS CVSD Digital Voice Codec D/639/3 February 2005 Provisional Issue Features Applications Single Chip Full Duplex CVSD codec Consumer and Business Handheld Devices Integrated Input and Output Filters Robust Coding for Wireless Links Digital Voice Appliances Programmable Sampling Clocks Spread Spectrum Wireless 3 and 4 bit Companding Algorithms Cordless Phones Low Power/Small Size for Portable Devices Voice Recording and Storage 1.9mA/2.75mA typ. 3.0V/5.0V Delay Lines 3.0V to 5.5V Operation Time Domain Scramblers Powersave Mode Multiplexers and Switches 1.1 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. 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), 16-pin SOIC (CMX639D4) and 22-pin PDIP (CMX639P6). 2005 CML Microsystems Plc CMX639P6 package discontinued CVSD Codec CMX639 CONTENTS Section Page 1.0 Features and Applications..................................................................... 1 1.1 Brief Description ..................................................................................... 1 1.2 Block Diagram......................................................................................... 3 1.3 Signal List ................................................................................................ 4 1.4 External Components............................................................................. 6 1.5 General Description................................................................................ 7 1.6 Application Notes ................................................................................... 7 1.7 Performance Specification..................................................................... 8 1.7.1 Electrical Performance................................................................. 8 1.7.2 Packaging .................................................................................. 15 CML Microsystems Plc 2 CMX639/3