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CIRCUIT. MC34118 Datasheet |
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| Part | MC34118 |
| Description | VOICE SWITCHED SPEAKERPHONE CIRCUIT |
| Manufacture | ART CHIP |
| Page | 2 Pages |
| 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
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VOICE SWITHCHED SPEAKERPHONE CIRCUIT
SILICON MONOLITHIC
INIEGRATED CIRCUIT
MC34118
www.artschip.com
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| 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. |
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