CML launches audio scrambler for radio equipment
CML Microcircuits
Audio scrambler and sub-audio signalling processor
Low-power semiconductor company CML Microcircuits has launched an audio scrambler and sub-audio signalling processor, intended for use in half-duplex analogue two-way radios or family radio equipment.
The CMX138A is an upgrade based on the CMX138 IC and is particularly suited to enhanced MURS, GMRS, PMR446 and FRS designs.
The highly integrated device provides a user-programmable frequency inversion audio scrambler with signal-processing functions, CTCSS, DCS and in-band tones, allowing comprehensive voice processing and tone control.
Enhancements for the CMX138A include: improved limiter functions; enhanced CTCSS and DCS performance; a new input automatic gain control (AGC) function; in-band tone operation enabled down to 288Hz; and improved audio compander, enhancing the performance of compressed signals.
These developments are designed to provide greater levels of tone control and voice processing.
Other features include an auxiliary ADC channel, auxiliary DAC interface with optional RAMDAC to facilitate transmitter power ramping, auxiliary system clock output and transmit output for single-point modulation.
The CMX138A also includes a crystal clock generator with buffered output to provide a common system clock if required.
The CMX138A is available in a small, low-power (3.0V to 3.6V with flexible power-save modes) 28-pin (E1) TSSOP package.
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