CMX838
FRS/PMR446/GMRS 'Family Radio'
(signalling and voice) Processor
Features:
- Advanced 'Any-One-of-Any' CTCSS Sub-Audio 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 Synthesiser for FRS, PMR446, MURS and GMRS RF Channels
- Configurable Charge-Pump
- Audio Call Tone Generator
- Audio Processing Provides:
- Mic Amplifiers
- Pre and De-Emphasis
- Limiter
- Post Limiter Filtering
- Mic Rx and Tx Digital Gain Controls
- Dual Tx Outputs
- Serial Control Interface
- Signal Source and 'External' Functions
Applications:
- Family Radio Service (FRS)
- Pan-European PMR 446; Hand Portable Mobile Radio
- General Mobile Radio Service (GMRS)
Packages:
Supply Requirement:
Description
The highly integrated CMX838 Family Radio Processor includes subaudio, audio, and synthesiser 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 support advanced end-product functions such as: group calling, scanning,
automatic scanner response tone setup, and Tone Cloning™.
The use of the CMX838 in one global radio design can support multiple standards and markets.
Controlled via a serial interface (C-BUS) this Family Radio Processor IC operates from a 3V to 5V supply
and is available in 28-pin TSSOP and SOIC packages.
Block Diagram
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