FX/MX128 Audio Band Scrambler

Description
The FX/MX128 is a full-duplex frequency inversion scrambler designed to provide secure conversations for 46/49 MHz cordless telephone users.
The Rx and Tx audio paths consist of the following:
1. A switched-capacitor balanced modulator with high baseband and carrier rejection.
2. A 3.3kHz inversion carrier (injection tone).
3. A 3100Hz 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 10.24MHz or 3.58/3.6864 MHz crystal or clock input (selectable). This device is available in 16-pin SOIC (FX128D4) and 16-pin plastic DIL (FX128P3) packages.

Resources: datasheet \| data updates \| application notes \|

Features Full Duplex Frequency Inversion Scrambling On-Chip Bandpass and Lowpass Audio Filters High Quality Audio Output Carrier Rejection >55dB Selectable Xtal/Clock Frequency: 10.24MHz or 3.58/3.6864MHz Low Power 3.0 to 5.0 V Supply Requirement	Applications Cordless Telephones Leisure Radio (FRS, GMRS, MURS and PMR446) Two-Way Radio Wireless PABX Base and Portable Systems Package Styles - FX128E4 - MX128E4 (TN) - FX128D4 - MX128DW - FX128P3 - MX128P Supply Requirement 3.0V power supply

Description The FX/MX128 is a full-duplex frequency inversion scrambler designed to provide secure conversations for 46/49 MHz cordless telephone users. The Rx and Tx audio paths consist of the following: 1. A switched-capacitor balanced modulator with high baseband and carrier rejection. 2. A 3.3kHz inversion carrier (injection tone). 3. A 3100Hz 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 10.24MHz or 3.58/3.6864 MHz crystal or clock input (selectable). This device is available in 16-pin SOIC (FX128D4) and 16-pin plastic DIL (FX128P3) packages.