MC34118 Просмотр технического описания (PDF) - Contek Microelectronics

Номер в каталоге

Компоненты Описание

Список матч

MC34118

VOICE SWITCHED SPEAKER PHONE CIRCUIT

Contek Microelectronics 

MC34118

LINEAR INTEGRATED CIRCUIT

VOICE SWITCHED SPEAKER-

PHONE CIRCUIT

DESCRIPTION

The Contek MC34118 voice switched speaker-phone

integrated circuit incorporates the necessary amplifiers,

attenuators, level detectors and control algorithm to form the

heart of a high quality hands-free speaker-phone system. It

includes a microphone amplifier with adjustable gain and

mute control. Transmit and Receive

attenuators which

operate in a complementary manner, level detectors at both

input and output of both attenuators, and background noise

monitors for both the transmit and receive channels. A dial

tone detector prevents the dial tone from being attenuated by

the receive background noise monitor circuit. Also two line

driver amplifiers which can be used to form a hybrid network

in conjunction with an external coupling transformer. A high-

pass filter can be used to filter out 60Hz noise in the receive

channel, or for other filtering functions. A chip disable pin

permits powers down the entire circuit to converse power on

long loops where loop current is at a minimum. The Contek

MC34118 may be operated from a power supply, or it can be

powered from the telephone line, requiring typically 5mA. The

Contek MC34118 can be interfaced directly to TIP and

RING( through a coupling transformer) for stand-alone

operation, or it can be used in conjunction with a handset

speech network and/or other features of a feature phone.

FEATURES

*Improved attenuator gain range: 52dB between Transmit

and Receive

*Low voltage operation for line-powered applications(3~6.5V)

*4-point signal sensing for improved sensitivity

*Background noise monitors for both Transmit and Receive

paths

SOP-28

DIP-28

*Microphone amplifier gain set by external

Resistors-Mute function included

*Chip disable for active/standby operation

*On board filter pinned-out for user defined

function

*Dial tone detector to inhibit receive idle mode

during dial tone presence

ABSOLUTE MAXIMUM RATINGS(Ta=25 C,Voltages referred to pin 22)

PARAMETER

SYMBOL

VALUE

Supply Voltage

Vcc

-1~7

Voltage at Pin 3

V3

-1~Vcc+1

Voltage at Pin 12( mute)

V12

-1~Vcc+1

Voltage at Pin 13( VLC)

V13

-1~Vcc+0.5

Voltage at Pin 9, Pin 21, and Pin 2

V9, 21, 2

-0.5~Vcc+0.5

Storage temperature

Tstr

-65~150

UNIT

V

V

V

V

V

C

Contek Microelectronics Co.,Ltd.

1

CONTEK

http://www.contek-ic.com E-mail:sales@contek-ic.com

Share Link: