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CMX7031, CMX7041 Two-Way Radio Processor: Voice, Signalling and Data

CMX138A Audio Scrambler and Sub-audio Signalling Processor

CMX881 PMR/Trunked Radio Baseband Processor

CMX882 Baseband Processor with GPS Data Signalling for FRS, MURS, PMR446 and GMRS Leisure Radios

CMX883 Baseband Processor for FRS, MURS, PMR446 and GMRS Leisure Radios

CMX823 Programmable Paging-Tone Decoder

CMX838 FRS/PMR446/GMRS Family Radio Processor IC

FX/MX465 Extended-Code CTCSS Encoder/ Decoder

FX214, FX224 Variable Split-Band Audio Scrambler IC

CMX264 Frequency Domain Split-Band Scrambler

FX/MX128 Audio Band Scrambler


FX/MX128 Full-duplex Audio Band 'Frequency Inversion' Scrambler IC
FX/MX128

Audio Band 'Frequency Inversion' Scrambler
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
Applications:
  • Cordless Telephones
  • Leisure Radio (FRS, GMRS, MURS and PMR446)
  • Two-Way Radio
  • Wireless PABX
  • Base and Portable Systems
Packages:
  • FX128D4 - 16-pin SOIC
  • FX128E4 - 16-pin TSSOP
  • FX128P3 - 16-pin PDIP
  • MX128E4 - 16-pin TSSOP
Supply Requirement:
  • 3.0 to 5.5 V 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).


Block Diagram

FX/MX029: two digitally-controlled gain and attenuation stages, with each stage having 48 distinct gain steps

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