CMX138 Audio Scrambler and Sub-audio Signalling Processor

Description
The CMX138 is a half-duplex audio scrambler and sub-audio signalling processor for analogue two-way radio applications. This makes it a suitable device for the leisure radio markets ( FRS, MURS, PMR446 and GMRS).

This device provides a user programmable frequency inversion audio scrambler with compnder and pre/de-emphasis - performing simultaneous processing of sub-audio and in-band signalling.

Other features include: an auxiliary ADC channel and an auxiliary DAC interface (with optional RAMDAC) to facilitate transmitter power ramping.
The device has flexible powersaving modes and is available in a 28-pin (E1) TSSOP package.

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Features Programmable Audio Scrambler Full Audio-band Processing: Pre and De Emphasis Compandor Scrambler Selectable 2.55 and 3.0 kHz Filters Auxiliary ADC and DAC C-BUS Serial Control/Data Interface to Host µController Two x Analogue Inputs (Mic. and Discriminator) Selectable Audio Processing Order CTCSS and DCS Sub-Audio Signalling Auxiliary System Clock Output Single-point Modulation Tx Output Flexible Powersave Modes	Applications Leisure Radio FRS, MURS, PMR446 and GMRS Package Styles: - CMX138E1 28-pin TSSOP Supply Requirement: 3.0 to 3.6 Volts

Description The CMX138 is a half-duplex audio scrambler and sub-audio signalling processor for analogue two-way radio applications. This makes it a suitable device for the leisure radio markets ( FRS, MURS, PMR446 and GMRS). This device provides a user programmable frequency inversion audio scrambler with compnder and pre/de-emphasis - performing simultaneous processing of sub-audio and in-band signalling. Other features include: an auxiliary ADC channel and an auxiliary DAC interface (with optional RAMDAC) to facilitate transmitter power ramping. The device has flexible powersaving modes and is available in a 28-pin (E1) TSSOP package.
Block Diagram