Enhanced audio scrambler and sub-audio signalling processor IC targets analog two-way radios

CML Microcircuit has added a new Audio Scrambler and Sub-audio Signalling Processor to the company's family of analog two-way radio ICs.

The CMX138A, an upgrade based on the CMX138 IC, is intended for use in half duplex analog two-way radios or family radio equipment, particularly suited to enhanced MURS, GMRS, PMR446 and FRS designs. Highly integrated by design, the 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.

Key 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 288 Hz, and improved audio compandor which enhances the performance of compressed signals. These developments are designed to provide even greater levels of tone control and voice processing, making the CMX138A the complete audio solution.

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 (3.0 V to 3.6 V with flexible powersave modes), 28-pin (E1) TSSOP package.

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