CMX264 View Datasheet(PDF) - MX-COM Inc
Part Name
Description
Manufacturer
CMX264 Datasheet PDF : 22 Pages
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COMMUNICATION ICs
DATA BULLETIN
CMX264
Frequency Domain
Split-Band Scrambler
ADVANCE INFORMATION
Features and Applications
• Ensures Privacy
• Full Duplex Operation
• High Quality Recovered Audio
• Low Height, Surface Mount Package
• 3.0V, Low Power Operation
• Fixed or Rolling Code
• Standby Mode
• Uses Split Band Inversion
• Low Current, Low Voltage
• 4.433619MHz Operation
MICIN
PE
MUX
fs
TXLBIPF
fs
CLEAR
fs
TXLBOPF
fs
å
DE
MUX
VDD
VBIAS
VSS
MICO
BIAS
TXUBIPF
TXUBOPF
BIAS
CS
SCLK
SDATA
SERIAL
PORT
CLOCK
GEN. &
CONTROL
XTAL
OSC
4.433619MHz
Xtal Pins
BIAS
XTAL
XTAL
RXIN
PE
MUX
BIAS
fs
fs
RXLBIPF
RXLBOPF
fs
fs
RXUBIPF
CLEAR
RXUBOPF
MUX
å
DE
MUX
MUX
BIAS
RECO
EXTO
MUTERX
The CMX264 is a frequency domain scrambler for use in analog cellular phone systems. It contains separate
Tx and Rx paths for full duplex operation and operates under µProcessor control via a simple serial interface.
In the Tx path, scrambling is achieved by splitting the audio band into two parts, or sub-bands, and frequency
inverting each one. The frequency at which the signal is split, the “split-point”, can be either fixed or rolling
between four possible settings resulting in a transmitted audio signal which is unintelligible to eavesdroppers.
Descrambling is achieved by a receive device set to the same split point as the remote transmitter. Thus if
the Tx and Rx devices are synchronously cycled through the same sequence of split points, a clear recovered
signal will emerge at the output of the receiver.
A 4.433619MHz crystal is used allowing up to four split points to be programmed. The device is designed to
be compatible with existing cell-phone circuitry.
The CMX264 operates at 3.0V and is available in a 24-pin SSOP (CMX264D5).
2000 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480210.002
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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