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SEMICONDUCTOR TECHNICAL DATA
ARCHIVED - 6/2010
MC34118
Voice Switched
Speakerphone Circuit
Silicon Monolithic Integrated 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 60 Hz 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 5.0 mA. 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.











1
1
PIN CONNECTIONS
(Top View)
TIP
BACKGROUND
NOISE MONITOR
VOLUME
CONTROL
LEVEL
DETECTORS
ATTENUATOR
CONTROL
ZB
Rx
ATTENUATOR
28
GND
2
27
CPR
CD
3
26
RLI1
VCC
4
25
RLO1
HTO+
5
24
TLO1
HTO--
6
23
TLI1
HTI
7
22
RXO
TXO
8
21
RXI
TXI
9
20
RLI2
MCO
10
19
RLO2
MCI
11
18
TLO2
MUT
12
17
TLI2
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