FX375LG

更新时间： 2024-11-21 22:48:55

品牌	Logo	应用领域
CMLMICRO		/
页数	文件大小	规格书
11页	133K
描述
Private Squelch Circuit

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中文翻译

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数据手册

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FX375LG 数据手册

CML Semiconductor Products

PRODUCT INFORMATION

FX375 Private Squelch Circuit

Publication D/375/4 July 1994

Features

Tone Operated Private/Clear

On-Chip Pre- and De-Emphasis

Filtering in the Tx Path

Switching

CTCSS Tone Encode/Decode

Separate Rx/Tx Speech Paths

38 Programmable Tones

+ 'NoTone' Facility

Fixed Frequency Speech Inversion

Audio Path Filtering

(300Hz – 3033Hz)

µP Compatible Interface with Serial

or Parallel Control Loading

Low Power 5V CMOS

CLEAR

BALANCED

MODULATOR

INPUT

FILTER

OUTPUT

Tx AUDIO OUTPUT

6dB/OCTAVE

Tx AUDIO INPUT

– 6dB/OCTAVE

f_EMPH

BIAS

f_CLK1

f_CLK2

f_CARRIER

PRIVATE

Rx AUDIO INPUT

Rx AUDIO OUTPUT

REFERENCE

HYSTERESIS

–

3333Hz

FILTERS

XTAL

Rx TONE DECODER OUTPUT

CLOCKS

DECODE COMPARATOR INPUT

Rx TONE DETECT OUTPUT

XTAL

Rx TONE INPUT

CTCSS

TONE

FX375

DETECT

LOAD/LATCH

3333Hz

D₅or SERIAL ENABLE 1

TONE

D₄or SERIAL ENABLE 2

D₃or SERIAL DATA INPUT

OUTPUT

8-BIT

SHIFT

D₂or SERIAL CLOCK INPUT

D₁INPUT

NOTONE OUTPUT

f_CARRIER

AND

LOGIC

f_CLK1

D₀I N P U T

V_DD

CONTROL

f_CLK2

LATCHES

Rx/Tx

f_EMPH

V_BIAS

Rx PATH

CONTROL

PRIVATE ENABLE

Tx PATH

PRIVATE

V_SS

PTL

PRESS TO LISTEN

Fig.1 Internal Block Diagram

Brief Description

The FX375 is a Low-Power CMOS LSI microcircuit

designed for Tone Operated Voice Privacy in

communication systems.

The Privacy function is exclusive only to units using the

same tone set, other intercepted signals remain "as

transmitted."

This half-duplex device consists of a Fixed Frequency

Voice Band Inverter interfaced with a Continuous Tone

Controlled Squelch System (CTCSS) Encoder/

Decoder, whose allocated tone is used for voice

privacy and audio squelch operation.

Frequency Inversion is achieved by modulating the

input audio with a fixed carrier frequency to exchange

the high and low frequencies of the voice band, making

the resulting audio output unintelligible to receivers not

equipped with a compatible system.

The on-chip CTCSS Dencoder is capable of encoding

and decoding any one of 38 sub-audio tones in the

range 67.0Hz to 250.3Hz, these Xtal derived tones are

selected by a 6-bit binary word that can be loaded to

the device in either a serial or parallel format.

A 'Press to Listen' facility allows monitoring of the

channel prior to transmitting.

This device has separate, switched Rx and Tx voice,

and tone audio paths. Voice paths use switched

capacitor bandpass filters for the attenuation of sub-

audio tones and unwanted modulation products.

6dB/octave pre- and de-emphasis filtering in the Tx

path maintains natural sounding audio from this device

when embodied in communication transceivers.

The FX375, which is available in DIL and SMT

packages, can be simply controlled by switches, or

interfaced to a µProcessor.

External requirements are a single 5-volt supply, an

external 4.0MHz Xtal or clock input and signal coupling

components.

12 3 4 5 6 7...11

中文翻译

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与FX375LG相关器件

型号	品牌	获取价格	描述	数据表
FX375LH	ETC	获取价格	Telecommunication IC
FX375LS	CMLMICRO	获取价格	Private Squelch Circuit
FX3AS06	ETC	获取价格	TRANSISTOR \| MOSFET \| P-CHANNEL \| 60V V(BR)DSS \| 3A I(D) \| TO-252AA
FX3AS2	ETC	获取价格	TRANSISTOR \| MOSFET \| P-CHANNEL \| 100V V(BR)DSS \| 3A I(D) \| TO-252AA
FX3AS-2	POWEREX	获取价格	Power Field-Effect Transistor, 3A I(D), 100V, 1-Element, P-Channel, Silicon, Metal-oxide S
FX3AS3	ETC	获取价格	TRANSISTOR \| MOSFET \| P-CHANNEL \| 150V V(BR)DSS \| 3A I(D) \| TO-252AA
FX3AS-3	POWEREX	获取价格	Power Field-Effect Transistor, 3A I(D), 150V, 1-Element, P-Channel, Silicon, Metal-oxide S
FX3ASH06	ETC	获取价格	TRANSISTOR \| MOSFET \| P-CHANNEL \| 60V V(BR)DSS \| 3A I(D) \| TO-252AA
FX3ASH2	ETC	获取价格	TRANSISTOR \| MOSFET \| P-CHANNEL \| 100V V(BR)DSS \| 3A I(D) \| TO-252AA
FX3ASH-2	POWEREX	获取价格	Power Field-Effect Transistor, 3A I(D), 100V, 1-Element, P-Channel, Silicon, Metal-oxide S

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