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

CMX138 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


Flexible Voice, Signalling and Data ICs for Analogue Radio
Analogue Two-way Radio Products
CML's Two-Way Radio products address both the full baseband and individual communication requirements of analogue military, PMR, trunked and leisure radio systems.

Many of the integrated 'baseband' processors offer voiceband, signalling and data functions as well as providing such additional system and RF support features as system clocks, RF synthesisers and auxiliary ADCs and DACs.

Two-way radio products included such features as:
  • Baseband functions: Voiceband, CTCSS, DCS, Selcall, XTCSS, Scrambling, Filtering, Data, Signal Routing, Gain and RF Support
  • Voiceband processing offers the majority of flexible functions: such as Signal Filtering, Companding, Scrambling, Pre and De-emphasis and the digital control of all on-chip signal paths and levels
  • In-band signalling in the form of DTMF, Selcall and general single, dual and multi-tone operations
  • Sub-audio signalling (CTCSS and DCS) and XTCSS, a combination of in-band and sub-audio signalling. Most signalling functions can operate alongside voice band operations.
  • Data functions are available on-chip, in both raw and packet formats, to enable both data-over-radio (telemetry) and/or control signalling
  • Control of the majority of CML's IC products is via C-BUS, a globally compatible serial control/data interface which, when taken together with on-chip processing capabilities, drastically reduces the host µC load.

< < < < < Please use the links on the left to view the relevant product overviews:

Product Comparisons
Product Voice Processing Tone Signalling RF Interface Data Auxiliary Supply
CMX138
Audio Scrambler and
Sub-audio Signalling Processor 		Half-duplex
Voice		 CTCSS, DCS   Analogue I/P
/Single-point Mod. O/P		   ADCs and DACs 3.0 to 3.6 V
CMX7031
Two-way Radio Processor
FI-1.x 		Full
Tx and Rx		 CTCSS, Selcall,
DTMF and NOAA NWR		 2 x RF Synths Analogue I/P
/Two-point Mod. O/P		 FFSK/MSK ADCs and DACs 3.0 to 3.6 V
CMX7031
4-Level FSK Modem
FI-2.x 		    2 x RF Synths Analogue I/P
/Two-Point Mod. O/P		 4-Level FSK ADCs and DACs 3.0 to 3.6 V
CMX7031
C4FM Modem
FI-3.x 		    2 x RF Synths Analogue I/P
/Two-Point Mod. O/P		 C4FM ADCs and DACs 3.0 to 3.6 V
CMX7041
Two-way Radio Processor
FI-1.x 		Full
Tx and Rx		 CTCSS, Selcall,
DTMF and NOAA NWR		   Analogue I/P
/Two-Point Mod. O/P		 FFSK/MSK ADCs and DACs 3.0 to 3.6 V
CMX7041
4-Level FSK Modem
FI-2.x 		      Analogue I/P
/Two-Point Mod. O/P		 4-Level FSK ADCs and DACs 3.0 to 3.6 V
CMX7041
C4FM Modem
FI-3.x 		      Analogue I/P
/Two-Point Mod. O/P		 C4FM ADCs and DACs 3.0 to 3.6 V
CMX838
Family Radio Processor 		Full Audio CTCSS, Audio Tone Synth. Analogue I/P and O/P     2.7 to 5.5 V
CMX823
Paging Tone Decoder		   Audio Tone Decoder   Analogue I/P and O/P     2.7 to 5.5 V
CMX881
PMR/LMR and Trunked Radio
Baseband Processor 		Full
Tx and Rx		 CTCSS/DCS,
Selcall		   Analogue I/P
/Two-Point Mod. O/P		 FFSK/MSK ADC 2.7 to 5.5 V
CMX882
Leisure Radio
Baseband Processor with GPS Transport 		Full
Tx and Rx		 CTCSS/DCS,
Selcall and XTCSS		   Analogue I/P
/Two-Point Mod. O/P		 FFSK/MSK ADC 2.7 to 5.5 V
CMX883
Leisure Radio
Baseband Processor 		Full
Tx and Rx		 CTCSS/DCS,
Selcall and XTCSS		   Analogue I/P
/Two-Point Mod. O/P		 FFSK/MSK ADC 2.7 to 5.5 V
FX/MX465
CTCSS Encoder / Decoder		 Voiceband
CTCSS Filters		 CTCSS   Analogue I/P and O/P     3.3 to 5.5 V
FX/MX128
Audio Band
Scrambler		 Voice Scrambler
Voiceband Filters		     Analogue I/P and O/P     3.0 to 5.5 V
FX214/224
Variable Split-
Band Scrambler		 Voice Scrambler/
CTCSS HPass Filter		     Analogue I/P and O/P     4.5 to 5.5 V
CMX264
Split-band
Scrambler		 Voice Scrambler
Voiceband Filters		     Analogue I/P and O/P     2.7 to 3.75 V

Evaluation Example
The EV8810 Evaluation Kit has been designed for the purpose of evaluating the CMX881, CMX882 and CMX883 baseband processor ICs.
In the form of a printed circuit board, this kit interfaces to the parallel port of a PC, running the supplied application software under Windows 95, 98, ME and NT 4.0 operating systems.

The on-board PIC microcontroller is a Flash device and can be reprogrammed via the controlling PC using the included programming software.
Both the target device and the Flash PIC are socketed for easy replacement.
This evaluation kit is supplied without any (CMX881, CMX882, CMX883) target device. Samples of these can be obtained separately from your local CML distributor.

The on-board audio power amplifier and 3.5mm jack socket can be used to connect an external loudspeaker; voice input can be handled via the on-board 'electret' microphone. A user prototyping PCB area is included on the board.

The board requires a 5V dc supply rail for the PIC microcontroller and another supply rail for the target IC, which can range from 2.7 to 5.5 V dc. These can be provided by one dual rail supply or two single rail supplies.

EV8810 Evaluation Kit: for evaluating and investigating the CMX881, CMX882 and CMX883 baseband processor ICs

Glossary
C-BUS CML's serial bus and control system used to communicate digital information between a µP or µC and peripheral ICs.
CTCSS Continuous Tone Controlled Squelch System.
DCS Digitally Coded Squelch.
FDMA Frequency Division Multiple Access.
LMR Land Mobile Radio.
NXDN A Common Air Interface (CAI) technical protocol for mobile communications.
PMR Private Mobile Radio.
TDMA Time Divisional Multiple Access.
TETRA TErrestrial Trunked RAdio.
XTCSS A unique squelch signalling format for radio systems, using both sub-audio (CTCSS) and in-band (XTC) signalling concurrently.