UNISONIC TECHNOLOGIES CO., LTD
MC34118
VOICE SWITCHED
SPEAKER-PHONE CIRCUIT
DESCRIPTION
DIP-28
LINEAR INTEGRATED CIRCUIT
As a voice switched speaker-phone integrated circuit, the UTC
MC34118
includes the necessary amplifiers, attenuators, level
detectors and control algorithm.
To form the UTC
MC34118’s
internal circuit, there is an internal
microphone amplifier with adjustable gain and mute control, internal
transmit and Receive attenuators (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.
The dial tone can be pretended from being attenuated by the
receive background noise monitor circuit by a dial tone detector.
There are 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 for other filtering functions, and especially
to filter out 60Hz noise in the receive channel.
The UTC
MC34118
which requiring typically 5mA may be
operated from a power supply, or it can be powered from the
telephone line.
SDIP-28
SOP-28
FEATURES
* Attenuator gain range: 52dB (between Transmit and Receive)
* For line-powered applications : 3~6.5V low voltage operation
* For improved sensitivity :4-point signal sensing
* For Transmit and Receive paths: background noise monitors
* External resistors set microphone amplifier gain
* Mute function included
* Chip disable: active or standby operation
* During dial tone presence: dial tone detector to inhibit receive idle
mode
ORDERING INFORMATION
Ordering Number
Lead Free
-
MC34118L-E28-T
-
-
Halogen Free
MC34118G-D28-T
MC34118G-E28-T
MC34118G-S28-T
MC34118G-S28-R
Package
DIP-28
SDIP-28
SOP-28
SOP-28
Packing
Tube
Tube
Tube
Tape Reel
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QW-R108-007.F
UNISONIC TECHNOLOGIES CO., LTD
LINEAR INTEGRATED CIRCUIT
MC34118
MARKING
PACKAGE
MARKING
SOP-28
SSOP-28
DIP-28
SDIP-28
PIN CONFIGURATION
FO
FI
CD
V
CC
HTO+
HTO-
HTI
TXO
TXI
MCO
MCI
MUT
VLC
CT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
GND
CPR
RLI1
RLO1
TLO1
TLI1
RXO
RXI
RLI2
RLO2
TLO2
TL12
CPT
VB
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QW-R108-007.F
UNISONIC TECHNOLOGIES CO., LTD
LINEAR INTEGRATED CIRCUIT
MC34118
PIN DESCRIPTION
PIN NO
1
2
3
PIN NAME
FO
FI
CD
DESCRIPTION
Output of filter. The output impedance is less than 50Ω.
Input of filter. The input impedance is less than 1MΩ.
Chip Disable input .A logic low (voltage lower than 0.8V) sets normal operation. A logic
high (voltage higher than 2V) disable the IC. This pin’s input impedance is 90 KΩ
nominally.
This pin requires a supply voltage of +2.8V ~ +6.5V at 5mA. After V
CC
falls from 3.5V ~
2.8V, when in the receive mode, an AGC circuit reduces the receive attenuator gain by
25dB.
The output of the second hybrid amplifier. This amplifier’s gain is internally set at -1.
Output of the first hybrid amplifier. This amplifier’s gain of the amplifier is set by
external resistors.
The first hybrid amplifier’s input and summing node. DC level is about equal to VB.
The transmit attenuator’s output. DC level is about VB.
The transmit attenuator’s input. It’s maximum signal level is 350 mVrms. The input
impedance is 10KΩ.
The microphone amplifier’s output. This amplifier’s gain is set by external resistors.
The summing node of the microphone’s input. DC lever is VB.
Input of mute. A logic low (voltage lower than 0.8V) sets the circuit normal operation. A
logic high (voltage higher than 2V) mutes the microphone amplifier, but it doesn’t affect
the rest of the circuit. The input impedance is 90 K ohms.
The input of Volume control. In the receive mode, when VLC=VB, the receive
attenuator is at maximum gain. The receive gain is down 35dB when VLC=0.3dB, and
it does not effect the transmit modes.
At this pin, to switch modes, the RC sets the response time for the circuit.
In this pin, there’s an output voltage=Vcc/2 which is a system AC ground and biases
the volume control. What required is a filter capacitor.
The time constant for the transmit background side can be set by the RC at this pin .
The input to the transmit level detector which is on the microphone/ speaker side.
The output to the transmit level detector which is on the microphone/ speaker side.
Also the input to the transmit background monitor.
The Output of the receive level detector which is on the microphone/ speaker side
The input to the receive level detector which is on the microphone/ speaker side
The input to the receive attenuator and dial tone detector. In this pin, the maximum
input level is 350mVrms,and the input impedance is 10KΩ.
The output of the receive attenuator. This pin’s DC level is VB.
The input to the transmit level detector which is on the line side.
The output to the transmit level detector which is on the line side, and also the input to
the transmit background monitor.
The output of the receive level detector which is on the line side.
The input to the receive level detector which is on the line side.
The time constant for the receive background monitor can be set by the RC at this pin.
Ground.
4
5
6
7
8
9
10
11
12
V
CC
HTO+
HTO-
HTI
TXO
TXI
MCO
MCI
MUT
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
VLC
CT
VB
CPT
TLI2
TLO2
RLO2
RLI2
RXI
RXO
TLI1
TLO1
RLO1
RLI1
CPR
GND
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QW-R108-007.F
UNISONIC TECHNOLOGIES CO., LTD
LINEAR INTEGRATED CIRCUIT
MC34118
BLOCK DIAGRAM
MUT
12
MCI 11
Background
Noise Monitor
MCO
10
TLI2
17
CT
14
TXI
9
TXO
8
TLI1
23
HTI
7
HTO-
6
VB
VB
Background
Noise Monitor
27
25
TLO2
RLO2
CD
FI
18
19
3
2
Level Delector
Altenuator
Conrol
Lever Detector
R
X
Attenuator
4
V
CC
24
CPR
RLO1
TOL1
HTO+
5
T
X
Attenuator
CPT
16
AGC
VB
1
FO
20
RLI2
13
VLC
22
RXO
21
26
15
28
GND
RXI RLI1 VB
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QW-R108-007.F
UNISONIC TECHNOLOGIES CO., LTD
LINEAR INTEGRATED CIRCUIT
MC34118
ABSOLUTE MAXIMUM RATING
(
T
A
=25°С,Voltages referred to pin 22)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
V
CC
-1~7
V
Voltage at Pin 3
V3
-1~V
CC
+1
V
Voltage at Pin 12 ( mute)
V12
-1~V
CC
+1
V
Voltage at Pin 13 ( VLC)
V13
-1~V
CC
+0.5
V
Voltage at Pin 9, Pin 21, and Pin 2
V9, 21, 2
-0.5~ V
CC
+0.5
V
Storage Temperature
T
STR
-65~+150
°С
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RECOMMENDED OPERATION CONDITIONS
PARAMETER
SYMBOL
V4
V3
V12
V13
I
VB
V9, V21
RATINGS
3.5~6.5
0~ V
CC
0~ V
CC
0.3×VB~VB
500
350
0~+-2
0~+-1
0~+-0.5
-20~+60
UNIT
V
V
V
V
µA
mVrms
mA
mA
mA
°С
Supply Voltage
Voltage at Pin 3
Voltage at Pin 12 ( MUTE)
Voltage at Pin 13 ( VLC)
IVB Current ( Pin 15)
Attenuator Input Signal Voltage at Pin 9, Pin 21
RXO, TXO(Pin8, Pin 22)
Load Current
MCO(Pin 10)
HTO-, HTO+(Pin 6, Pin5)
Ambient Operating Temperature
T
OPR
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C, unless otherwise specified)
SYMBOL
I
CC
R
CD
V
CDH
V
CDL
V
B
R
OVB
PSRR
G
RX
G
RX
G
RX1
G
RX2
G
RXI
G
RX3
V
CR
V
RXO
V
RXO
V
RXOH
V
RXOL
R
RXI
TEST CONDITIONS
V
CC
=6.5V, CD=0.8V
V
CC
=6.5V, CD=2V
V
CC
=V
CD
=6.5V
MIN
TYP
5.5
600
90
MAX UNIT
8
800
V
CC
0.8
1.3
2.1
400
54
2.4
Ω
dB
dB
dB
dB
dB
dB
dB
dB
V
mV
V
V
kΩ
mA
μA
kΩ
V
V
V
PARAMETER
Supply Voltages
V+ Supply Current
CD Input Resistance
High
CD Input Voltage
Low
V
B
Output Voltage
V
B
Output Resistance
V
B
Power Supply Rejection Ratio
Attenuators
R
X
Mode, R
XI
=150mVrms
R
X
Mode, R
XI
=150mVrms
Receive Attenuator
Gain Change
Gain
AGC Gain Change
(f=1kHz, V
LC
=V
B
)
Idle Mode, R
XI
=150mVrms
R
X
to T
X
Mode Range
Volume Control Range
R
XO
DC Voltage
R
XO
DC Voltage
R
XO
High Voltage
R
XO
Low Voltage
R
XI
Input Resistance
50
2
V
CC
=3.5V
V
CC
=5V
I
VB
=1mA
C
VB
=220µF, f=1kHz
V
CC
=5V
V
CC
=3.5V
V
CC
=3.5V vs. V
CC
=5V
V
CC
=3.5V vs. V
CC
=5V
1.8
4
4
-0.5
-22
49
27
R
X
Mode
R
X
to T
X
Mode
I
OUT
=-1mA, R
XI
=V
B
+1.5V
I
OUT
=+1mA, R
XI
=V
B
-1V,
Output Measured with
Respect to V
B
R
XI
<350mVrs
6
8
6
8
0
+0.5
-25
-15
-20
-17
52
54
35
V
B
+-10 +-150
3.7
-1.5
7
10
-1
14
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QW-R108-007.F
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