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 carriers 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.

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)