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CMX808A

Family Radio Service CTCSS Processor

MX-COM Inc  

DATA BULLETIN

CMX808A

Family Radio Service

CTCSS Processor

PRELIMINARY INFORMATION

Features

• Rapid multi-tone CTCSS decoder

supports new end user features

• Fast Tone Decode (150ms)

• Supports Tones from 62.5Hz to 251Hz

• Integrated 32 Step Digital Volume

Control (-48.0dB to 0dB + Off)

• Tone Cloning Capabilities

• Sub-Audio Tone Rejection Filter

• Low Power 3.0V to 5.5V Operation

• Very small 20-pin TSSOP Package

• 4.0MHz Xtal/Clock Oscillator

Applications

• Family Radio Service (FRS) Radios

• Amateur Radio Equipment

• General Mobile Radio Service (GMRS)

• Short Range Business Radio

CMX808A

RADIO

MODULATOR

RF

DISCRIMINATOR

FAST CTCSS

Tx

AUDIO FILTER

Rx

VOLUME CONTROL

SERIAL 'C-BUS'

DATA & CONTROL

HOST

µC

KEYPAD

DISPLAY

The CMX808A is a programmable CTCSS encoder/decoder optimized for Family Radio Service transceivers

through a combination of leading edge performance, low cost, small size, and low power. With rapid

response time and the ability to decode one-of-many possible tones, the decoder enables practical tone

scanning to allow an FRS radio to quickly decode received CTCSS tones by 'listening' to the CTCSS tone

transmissions of other FRS radios. This feature can be used to:

1. Readily support both individual (one person) and group (e.g. children vs. adults) call codes.

2. Support quick and automatic resolution of radio user frustration caused by mismatched CTCSS tone

configurations in CTCSS-based FRS radios. In some cases, this approach can be used to match

CTCSS tone decoder configurations to different vendors' CTCSS-based FRS radios when supported

tone sets are not clearly documented or well understood.

With integrated digital volume control and a simple serial control interface, the CMX808A features very low

power consumption and small size. The CMX808A requires a 3.0V to 5.5V power supply and is available in

the following packages: 20-pin TSSOP (CMX808AE3) and 24-pin PDIP (CMX808AP4).

©1999 MX-COM, Inc.

www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054

Doc. # 20480199.002

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

All trademarks and service marks are held by their respective companies.

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