CMX138A Datasheet | Consumer Microcircuits Limited

Features - Programmable Audio Scrambler - Concurrent Audio/Signalling Operations - Full Audio-band Processing: Pre and De-emphasis, pandor, Scrambler and Selectable 2.55/3 k Hz Filters - Auxiliary ADC and Auxiliary DAC - Selectable Audio Processing Order - Sub-audio Signalling: CTCSS, DCS - Auxiliary System Clock Output - Tx Output for Single-point Modulation - Low-power (3.0V to 3.6V) Operation - Flexible Powersave Modes - C-BUS Serial Interface to Host µController - Available in 28-pin TSSOP Package - Two Analogue Inputs (Mic or Discriminator) DAC Output ADC Input 3.0V to 3.6V Modulator Discriminator RF GPIO Audio Scrambler and Sub-Audio Processor Built on Firm ASIC® technology C-BUS Host µC System Clock 1 Reference Clock 1 Brief Description The CMX138A is a half-duplex, audio scrambler and sub-audio signalling processor IC for Analogue Twoway 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, panding and pre/deemphasis - 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.  2014 CML Microsystems Plc Audio Scrambler and Sub-Audio Signalling Processor CONTENTS Section Page 1 Brief Description 2 History...