Audio Band Scrambler
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
FX/MX128
Audio Band Scrambler
D/128/2 January 2003
Provisional Informa...
Description
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
FX/MX128
Audio Band Scrambler
D/128/2 January 2003
Provisional Information
Features
Full-Duplex Audio Processing On-Chip Filters Carrier Rejection >55dB Uses IF (10.24 MHz) Clock Excellent Audio Quality Low Power Operation (3.0V) Battery Powered Portability
Applications
Cordless Telephones Wireless PBX Two-Way Radio Leisure Radio
(FRS, GMRS, MURS, PMR446)
1.1 Brief Description The FX/MX128 is a full-duplex frequency inversion scrambler designed to provide secure conversations. The Rx and Tx audio paths consist of the following:
1. A switched-capacitor balanced modulator with high baseband and carrier rejection. 2. A 3.3 kHz inversion carrier (injection tone). 3. A 3100 Hz lowpass filter. 4. Input op-amps with externally adjustable gain. The FX/MX128 uses mixed signal CMOS switched-capacitor filter technology and operates from a single supply in the range of 3.0 to 5.5 volts. The inversion c...
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