CMX639 查看數據表（PDF） - CML Microsystems Plc

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CMX639

Consumer / Commercial CVSD Digital Voice Codec

CML Microsystems Plc 

CMX639

Consumer / Commercial

CVSD Digital Voice Codec

D/639/2 November 2000

Features

Applications

Provisional Issue

• Single Chip Full Duplex CVSD codec

• Consumer and Business Handheld

• Integrated Input and Output Filters

Devices

• 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

output’s 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).

© 2000 Consumer Microcircuits Limited

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