CMX639 查看數據表（PDF） - MX-COM Inc
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CMX639 Datasheet PDF : 12 Pages
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COMMUNICATION ICs
DATA BULLETIN
CMX639
Consumer / Commercial
CVSD Digital Voice CODEC
PRELIMINARY INFORMATION
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
ENCODE
ANALOG IN -
+
ENCODE
TIMING
DECODE
DATA IN
COMMON
TIMING
COMPAND
REGISTER
IDLE
CHANNEL
STABILIZER
+
-
COMPAND
REGISTER
ENCODE DATA OUT
PULSE
GENERATOR
PRINCIPAL
SYLLABIC
INTEGRATOR
X
INTEGRATOR
PULSE
SYLLABIC
PRINCIPAL
GENERATOR
INTEGRATOR
X
INTEGRATOR
DECODE
ANALOG
OUT
DECODE
TIMING
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 tri-state enable feature.
The CMX639 operates from 3.0V to 5.5V and is available in the following packages: 24-pin TSSOP
(CMX639E2), 16-pin SOIC (CMX639D4) and 22-pin PDIP (CMX639P6).
2000 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480209.006
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
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