The highly integrated CMX838 Family Radio Processor includes subaudio, audio, and synthesizer functions to serve as the core engine for low cost, high performance FRS, PMR446, and GMRS radio designs. Its flexibility supports both simple and advanced multi-channel radios without cost penalties. Integrated Tx voltage reference and baseband clock generation circuits eliminate the need for external components. The CMX838’s features directly supports advanced end product functions such as: group calling, scanning, automatic scanner response tone setup, and Tone Cloning™.

FEATUREs and Applications
• Advanced one-of-any CTCSS subaudio 50 tone processor
   • Fast decode time
   • IRQ on any / all valid tones
   • Fast scan, group calling, auto response tone select and Tone Cloning™ support
   • Supply Independent output level
• RF Synthesizer
   • FRS, PMR446 and GMRS RF channels
   • Configurable charge pump
• Audio call tone generator
   • Audio processing
   • Mic amplifier
   • Pre/Deemphasis
   • Limiter with Supply Independent output level
   • Post limiter filtering
   • Mic, Rx and Tx digital gain controls
   • Single and dual Tx outputs
• Signal source and external function switches
• Low power, 3V to 5V supply
   • Powersave and sleep modes
• Serial control interface