FX/MX128
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
D/128/2 January 2003
Audio Band
Scrambler
Provisional Information
Features
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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
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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 carrier's frequency and filter switching clock are
generated on-chip using an external 10.24 MHz or 3.58/3.6864 MHz crystal or clock input (selectable).
This device is available in the following package styles: 16-pin SOIC,TSSOP and PDIP.
©
2003 CML Microsystems Plc
CMLMICRO [ CML MICROCIRCUITS ]
