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DATA BULLETIN

MX375

Features

鈥?/div>

PRIVATE/CLEAR CAPABILITY

鈥?/div>

ON-CHIP TX AUDIO PRE/DEEMPHASIS

鈥?/div>

ALTERNATIVE TO STANDARD CTCSS

鈥淧ARTY LINE鈥?/div>

鈥?/div>

POWERSAVE OPTION

Pvt

SQUELCH

TM

CTCSS

Encoder/Decoder

Applications

鈥?/div>

MOBILE RADIOS

鈥?/div>

COMMUNITY REPEATERS

鈥?/div>

TELEPHONE/RADIO INTERCONNECT

SYSTEMS

TX

TX Audio

Input

6dB/Octave

TX

Filter

Output

Balanced

Modulator

CLR

Input

-6dB/Octave

TX Audio Output

RX

BIAS

RX

RX Audio

Input

XTAL

RX Tone Input

Load/Latch

D5 or Serial Enable 1

D4 or Serial Enable 2

D3 or Serial Data Input

D2 or Serial Clock Input

D1 Input

D0 Input

RX/TX

Control

Private Enable

Push-To-Listen

PTL

8-Bit

Shift

Register

and

Latches

LD5-LD0

Logic

Control

f

CARRIER

NoTone Output

f

CLK1

V

DD

f

CLK2

f

EMPH

RX Path

V

BIAS

TX Path

Private

V

SS

f

EMPH

f

CLK1

f

CARRIER

f

CLK2

f

EMPH

PVT

BIAS

TX

RX Audio Output

3333Hz

Reference

Hysteresis

Clocks

Filters

RX Tone Decoder Output

Decode Comparator Input

RX Tone Detect Output

CTCSS

Tone Detect

3333 Hz

TX Tone

Output

The MX375 is a CMOS LSI microcircuit which combines CTCSS Encode/Decode operation with voice band frequency

inversion. Frequency inversion is achieved by modulating the input audio with a 3333 Hz carrier frequency. Higher voice

band frequencies are translated downward, and lower frequencies upward, resulting in a 鈥渕irror image鈥?voice

transmission.

PvtSQUELCH鈩?/div>

combines CTCSS with inverted speech to prevent users from understanding each other鈥檚

communications unless the transmissions are accompanied by the group鈥檚 assigned tone. Its net effect is to eliminate

casual eavesdropping and give mobile radio users a certain degree of privacy at a minimal price. Up to 38

PvtSQUELCH

user groups (one per CTCSS tone) can share a single radio channel. With

PvtSQUELCH,

competing businesses can

share a radio channel without compromising communications security.

Device features: 1) serial or parallel tone programming capability (serial or parallel offered on MX375J, P & LH8), 2) the

ability to operate under NOTONE conditions, 3) on-chip Tx and Rx audio filtering, 4) pin-selectable Private/Clear

operation, and 5) pre/deemphasis filters in the Tx path, for optimal recovered audio quality.

A low-cost 4 MHz crystal/clock and a single 5V supply are required for operation. The MX375 is available in the following

package styles: 28-pin PDIP (MX375P), 28-pin CDIP (MX375J) 28-pin PLCC (MX375LH8), and

24-pin PLCC (MX375LH).

漏 1997 MX鈥OM Inc.

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

Fax: 910 744-5054

Doc. # 20480026.007

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

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

型號

版本

描述

廠商

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