CMX838 查看數據表（PDF） - CML Microsystems Plc

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CMX838

FRS/PMR446/GMRS Family Radio Processor

CML Microsystems Plc 

CML Microcircuits

COMMUNICATION SEMICONDUCTORS

CMX838

FRS/PMR446/GMRS

Family Radio Processor

D/838/8 September 2003

Provisional Issue

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/De-emphasis

• 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

AUX I/O

MICOUT

MICIN

RXIN

AUDIO PROCESSOR

GENERAL PURPOSE

TIMER AND TONE

GENERATOR

PROGRAMMABLE SUB-

AUDIO PROCESSOR

TIMING

GENERATION

REFIN

-RFIN

+RFIN

ISET

CPOUT

SVDD

SVSS

S

RF SYNTHESIZER

RXOUT

MODULATION OUTPUT

SELECT AND LEVEL

CONTROL

C-BUS

XTAL

TXMOD1

TXMOD2

IRQ

RPLY DATA

CMD DATA

SERIAL CLOCK

CS

XTAL

XTAL

BIAS

A

VDD

VBIAS

VSS

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™.

By using the CMX838 one global radio design can support multiple standards and markets.

Controlled via a serial interface (C-BUS) the Family Radio Processor operates from a 3V to 5V supply and is

available in 28-pin TSSOP (CMX838E1) and 28-pin SOIC (CMX838D1) packages.

 2003 CML Microsystems Plc

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