DATA BULLETIN

© 1997 MX•COM, INC.

www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054

Doc. # 20480013.006

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

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

Features

Applications

• CTCSS Compatible

• Fixed Frequency Inversion

• Low Power CMOS

• Land Mobile Radio Systems

• Community Repeaters

6dB/Octave

Pre-emphasis

10dB Gain

TX Audio Feedback

TX Audio In

RX Audio In

RX Audio Feedback

BIAS

RX Path

Rx Path

Bandpass

Filter

300-3033 Hz

Bandpass

Filter

300-3033 Hz

Filsav 1

Filsav 1

Filsav 2

Carrier

6dB/Octave

De-emphasis

Path Invert

TX

TX

RX Path

TX Audio Out

RX Audio Out

BIAS

CLK Generator

Clock

Clock

CLK

3333 Hz

V

BIAS

V

3333 Hz

PTT

PTT

RX Audio Enable

RX Audio Enable

PTL

PTL

Privacy Enable

Carrier

Filsav 1

Filsav 2

RX Path

EMPSAV

TX

Path Invert

LOGIC

DD

SS

The MX014 Voice Band Inverter gives the security of private voice communications to land mobile radio users, as well as

to the users of other shared radio channel systems. Designed for use in half-duplex systems, the MX014 exchanges high

and low frequencies in the voiceband and renders transmitted messages unintelligible. This privacy function is achieved

by a single frequency inversion. When used with CTCSS,

PvtSQUELCH

Sharp cut-off in the internal voiceband filters permits operation with CTCSS and similar sub-audio signaling schemes. This

results in high quality recovered audio.

The core of the MX014 consists of two audio band pass filters and a balanced modulator. The device uses a

programmable clock divider which controls the carrier and filter cut-off frequencies. Control of the RX/TX, PTL and

privacy function is by pin selection.

The MX014 operates from a single 5V supply and uses a 4 MHz crystal oscillator to ensure the correct pitch in recovered

speech. Signal coupling and decoupling are the only external components needed. The device is available in 24-pin

PLCC (MX014LH), 24-pin PDIP (MX014P) and 24-pin CDIP (MX014J) packages.