CIRCUIT. MC34118 Datasheet

MC34118 Datasheet PDF


Part

MC34118

Description

VOICE SWITCHED SPEAKERPHONE CIRCUIT

Manufacture

ART CHIP

Page 2 Pages
Datasheet
Download MC34118 Datasheet


MC34118 Datasheet
MC34118
Specifications and Applications Information
VOICE SWITCHED SPEAKERPHONE CIRCUIT
The MC34118 Voice Switched Speakerphone Circuit
incorporates the necessary amplifiers, attenuators, level
detectors, and control algorithm to form the heart of a high
quality hands-free speakerphone system. Included are 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 included are 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
powering down the entire circuit to conserve power on long
loops where loop current is at a minimum.
The MC34118 may be operated from a power supply, or it can
be powered from the telephone line, requiring typically 5.0mA.
The 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 featurephone.
z Improved Attenuator Gain Range:52dB Between Transmit and
Receive
z Low Voltage Operation for Line-Powered Applications (3.0-6.5V)
z 4-Point signal Sensing for improved Sensitivity
z Background Noise Monitors for Both Transmit and Receive
Paths
z Microphone Amplifier Gain Set by External Resistors – Mute
Function Included
z Chip Disable for Active/Standby Operation
z On Board Filter Pinned-Out for User Defined Function
z Dial Tone Detector to Inhibit Receive idle mode During Dial Tone
Presence
z Standard 28-Pin Plastic DIP Package and SOIC Package
Available
z Compatible with MC34119 Speaker Amplifier
SIMPLIFIED BLOCK DIAGRAM
www.artschip.com
1

MC34118 Datasheet
VOICE SWITHCHED SPEAKERPHONE CIRCUIT
SILICON MONOLITHIC
INIEGRATED CIRCUIT
MC34118
www.artschip.com
2


Features Datasheet pdf MC34118 Specifications and Applications Information VOICE SWITCHED SPEAKERPHO NE CIRCUIT The MC34118 Voice Switched S peakerphone Circuit incorporates the ne cessary amplifiers, attenuators, level detectors, and control algorithm to for m the heart of a high quality hands-fre e speakerphone system. Included are a m icrophone amplifier with adjustable gai n and MUTE control, transmit and Receiv e attenuators which operate in a comple mentary manner, level detectors at both input and output of both attenuators, and background noise monitors for both the transmit and receive channels. A Di al Tone Detector prevents the dial tone from being attenuated by the Receive b ackground noise monitor circuit. Also i ncluded are two line driver amplifiers which can be used to form a hybrid netw ork in conjunction with an external cou pling transformer. A high-pass filter c an be used to filter out 60Hz noise in the receive channel, or for other filte ring functions. A Chip Disable pin permits powering down the en.
Keywords MC34118, datasheet, pdf, ART CHIP, VOICE, SWITCHED, SPEAKERPHONE, CIRCUIT, C34118, 34118, 4118, MC3411, MC341, MC34, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute, Equivalent




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)