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Número de pieza UTCMC34018
Descripción VOICE SWITCHED SPEAKER-PHONE CIRCUIT
Fabricantes Unisonic Technologies 
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No Preview Available ! UTCMC34018 Hoja de datos, Descripción, Manual

UTCMC34018 LINEAR INTEGRATED CIRCUIT
VOICE SWITCHED
SPEAKER-PHONE CIRCUIT
DESCRIPTION
The UTC MC34018 speaker-phone integrated circuit
incorporates the necessary functions to produce a high
quality hands-free speaker-phone system. The applications
include household and office speaker-phones, intercom
systems, hand free kit for mobile phones, and others.
FEATURES
*All necessary level detection and attenuation controls for a
hand-free telephone included.
*Background noise level monitoring with long time constant.
*Background sound level compensation for transmit and
receive levels as well as the background level.
*Wide operating dynamic range through signal compression.
*On-chip voltage regulators illuminate external regulators for
lining operation.
*Power audio amplifier for typical 100mW output (into 25
ohms)with peak limiting for speaker to minimize distortion.
*Chip Select pin for active/stand by operation.
*Volume control function for external volume control.
*Standard 28-pin plastic DIP and SOP package.
ABSOLUTE MAXIMUM RATINGS(Ta=25°C,Voltages referred to pin 22)
PARAMETER
VALUE
V+ terminal Voltage (pin 16)
+12,-1.0
CS (pin 18)
+12,-1.0
Speaker amplifier Ground(pin 14)
+3.0,-1.0
VLC(pin 24)
+VCC,-1.0
Storage temperature
-65 ~ +150
SOP-28
DIP-28
UNIT
V
V
V
V
°C
RECOMMENDED OPERATION CONDITIONS
PARAMETER
V+ Terminal Voltage (pin 16)
CS (pin 18)
Icc(pin 20)
VLC(pin 24)
Receive Signal(pin 27)
Microphone Signal(pin 9)
Speaker Amplifier Ground (pin 14)
Ambient Temperature
VALUE
+6.0 to +11
0 to +11
0 to 3.0
0.55VB to VB
0 to 250
0 to 5.0
-10 to +10
-20 to +60
UNIT
V
V
mA
V
mVrms
mVrms
mVdc
°C
UTC
UNISONIC TECHNOLOGIES CO., LTD. 1
QW-R108-006,A

1 page




UTCMC34018 pdf
UTCMC34018 LINEAR INTEGRATED CIRCUIT
(continued)
PARAMETER
SYMBOL
MIN
TYP
LOGAMPS
RLO Leakage Current
ILKRLO
(Pin 8 = VB+1.0V)
TLO Leakage Current
ILKTLO
(Pin 6 = VB+1.0V)
Transmit-Receive Switching
Threshold (Ratio of ITLI to IRLI - at
ITH
25
20µA - to Switch Tx-Rx
Comparator)
TRANSMIT DETECTOR
XDC Voltage
Idle Mode
Tx Mode
VXDC
0
4.0
CP2 Current Source
ICP2
5.0 10
Distortion
Rx Mode
RXI to SKO RXD 1.5
(pin 27 = 10mVrms,1KHz)
Tx Mode
MCI to TXO
TXD
2.0
(Pin 9 = 5mVrms,1KHz)
Note 1:V+=7.5V,CS =0.7V except where noted.
Note 2:Rx mode:pin7=-100µA,pin5=+100µA, except where noted.
Tx mode: pin 5,13=-100µA, pin 7=+100µA, pin 11=0V.
Idle mode: Pin 5=-100µA, pin 7,13=+100µA.
Note 3:Current into a pin designed as +,current out of a pin designed -;
Note 4:Voltage referred to pin 22,Tamb=25°C.
MAX
2.0
2.0
13
TEMPERATURE CHARACTERISTICS(-20 TO +60°C )
PARAMETER
PIN TYP CHANGE
V+ Supply Current ( V+ 11V,Pin 18 = 0.7V )
16
-0.2
V+ Supply Current(V+ 11V,Pin 18 = 1.6V )
VCC Voltage( V+ = 7.5V )
Attenuator Gain ( Max and Min Setting )
Delta RXO,TXO Voltage
Speaker AMP Gain
Microphone AMP Gain
Microphone Amp Input Resistance
Tx-Rx Switching Threshold (20µA)
16
20
4,26
15,19
9,10
9
5,7
-0.4
+0.1
+-0.003
+-0.24
+-0.001
+-0.4
+0.4
+-0.2
DESIGN GUIDELINES(REF TO FIG. 1)
UNIT
µA
µA
Vdc
Vdc
µA
%
%
UNIT
%/°C
%/°C
%/°C
dB/°C
%/°C
dB/°C
dB/°C
%/°C
nA/°C
ATTENUATORS
The transmit and receive attenutors are complementary in function, i.e., when one is at maximum gain the other
is at maximum attenuator, and vice versa. They are never both on or both off. Their main purpose is to control the
transmit and receive paths to provide the half-duplx operation required of a speaker-phone. The attenuators are
controlled solely by the voltage at the ACF pin(pin 25).The ACF voltage is provided by the attenuator control block,
UTC UNISONIC TECHNOLOGIES CO., LTD. 5
QW-R108-006,A

5 Page





UTCMC34018 arduino
UTCMC34018 LINEAR INTEGRATED CIRCUIT
Fig 2 Transmit attenuator versus RTX
+20
+10
0
-10
Max Gain
Vacf=6.0mV
-20
-30
Max Attenuation
-40 Vacf=150mV
-50
RR=30k ohms
VLC=VB
-60
-70
10k
100k
RTX (ohms)
1M
Fig 4 Gain and attenuation versus
Resisrtor Ratio
+20
+10
GRX vs RRX/RR
Vacf=150mV
GTX vs RTX/RR
Vacf=6.0mV
0
-10
-20
-30
ARX vs RRX/RR
Vacf=6.0mV
-40
-50
-60
ATX vs RTX/RR
Vacf=150mV
VLC=VB
-70
0.1 1.0 10
Ratio
Fig 3 Receive attenuator versus RRX
+20
+10
0
-10
Max Gain
Vacf=6.0mV
-20
-30
-40
-50
RR=30k ohms
VLC=VB
-60
-70
Max Attenuation
Vacf=150mV
Usable range
1k 10k
RRX (ohms)
100k
Fig 5 Attenuation Gain versus VLC
+10
RRX=18k ohms
RTX=91k ohms
RR=30k ohms
0
GTX
GRX
-10
Circuit in
receive
mode
-20
-30
-40
0
Mimimum
recommended
level
0.2 0.4 0.6 0.8
1.0
UTC
UNISONIC TECHNOLOGIES CO., LTD. 11
QW-R108-006,A

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