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PDF UTC34018 Data sheet ( Hoja de datos )
| Número de pieza | UTC34018 | |
| Descripción | Voice Switched Speakerphone Circuit | |
| Fabricantes | Youwang | |
| Logotipo |  |
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UTC34018
LINEAR INTEGRATED CIRCUIT
VOICE SWITCHED
SPEAKERPHONE CIRCUIT
DESCRIPTION
The UTC34018 speakerphone integrated circuit incor-
porates the necessary amplifier, attenuators, and control
functions to produce a high quality hands-free speakerphone
system. Included are a microphone amplifier, a power audio
amplifier for the speaker, transmit and receive attenuators, a
monitoring system for background sound level, and an
attenuation control system which responds to the relative
transmit and receive levels as well as the background level.
Also included are all necessary regulated voltages for both
internal and external circuitry, allowing lining powered
operation(no additional power supplies required).A chip
select pin allows the chip to be powered down when not in
use. A volume control function may be implemented with an
external potentiometer. The UTC34018 applications include
speakerphones for household and business use, intercom
systems, automotive telephones, and others.
FEATURES
*All necessary level detection and attenuation controls for a
hand-free telephone in a single integrated circuit
*Background noise level monitoring with long time constant
*Wide operating dynamic range through signal compression
*On-chip supply and reference voltage regulation
DIP-28
*Typical 100mW output power(into 25 ohms)with
peak limiting to minimize distortion
*Chip Select pin for active/standby operation
*Linear Volume control function
*Standard 28-pin plastic DIP package
ABSOLUTE MAXIMUM RATINGS(Ta=25°C Voltages referred to pin 22)
CHARACTERISTICS
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
UNITS
V
V
V
V
°C
RECOMMENDED OPERATION CONDITIONS
CHARACTERISTICS
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
UNITS
V
V
mA
V
mVrms
mVrms
mVdc
°C
YOUW ANG ELECTRONICS CO.LTD
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UTC34018
LINEAR INTEGRATED CIRCUIT
(continued)
PARAMETER
SYMBOL
MIN
TYP
LOGAMPS
RLO leakage Current
(pin 8=VB+1.0V)
ILKRLO
ü
ü
TLO leakage Current
(pin 6=VB+1.0V)
ILKTLO
ü
ü
Transmit-Receive switching
threshold(Ratio of ITLI to IRLI --at
20µA--to switch Tx-Rx
&omparator)
ITH
25
TRANSMIT DETECTOR
XDC voltage
Idle mode
Tx mode
VXDC
ü0
ü 4.0
CP2 current source
ICP2
5.0 10
Distortion
Rx mode
RXI to SKO
RXD ü 1.5
(pin 27=10mVrms,1.0kHz)
Tx mode
MCI to TXO
(pin 9=5.0mVrms,1.0kHz)
TXD ü 2.0
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
ü
ü
13
ü
ü
TEMPERATURE CHARACTERISTICS(-20 TO +60°C )
Parameter
Pin
V+ supply current(V+ 11V,Pin 18=0.7V)
16
V+ supply current(V+ 11V,Pin 18=1.6V)
16
VCC Voltage(V+=7.5V)
20
Attenuator Gain(max and min setting)
Delta RXO,TXO Voltage
4,26
Speaker AMp Gain
15,19
Microphone AMp Gain
9,10
Microphone Amp Input resistance
9
Tx-Rx switching threshold(20µA
5,7
Typ change
-0.2
-0.4
+0.1
±0.003
±0.24
±0.001
±0.4
+0.4
±0.2
UNIT
µA
µA
Vdc
Vdc
µA
%
%
Unit
%/ °C
%/ °C
%/ °C
dB/ °C
%/ °C
dB/ °C
dB/ °C
%/ °C
nA/ °C
YOUW ANG ELECTRONICS CO.LTD
5
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UTC34018
LINEAR INTEGRATED CIRCUIT
TRANSMIT
OUTPUT
MIC
0.05µF
VB
12kΩ
9
2kΩ 0.1µF
MCI
3.3kΩ
5
0.068µF
TLI
VB
6 TLO
4.7kΩ
0.068µF
7 RTI
VB
0.068µF
4.7kΩ
4.7µF
47µF
DC line input
1000µF
Receive input
59kΩ
10 13
MCO XDI
12
CP2
MIC AMP
VB
500Ω
TRANSMIT
LOG AMP
VB
33kΩ
56kΩ
Attenuator
control
11
CP1
transmit
detector comp
23
XDC
Vcc
18
CS
26kΩ
VCC
regulator
Vth
(36mV)
peak
limiter
16
V+
Vcc 47µF
5.4V 20
22
GND
AGC
17
VB
1.0µF
RECEIVE/TRANSMIT
COMP
500Ω
Vcc
VB
regulator
transmit
attenuator
receive
attenuator
Vcc
Speaker
amp
RECEIVE
AMP
1.0µF
RLO
VB VLC ACF TXI RTX RR TXO RXI RRX RXO SKI
8 21 24 25 3 2 1 4 27 28 26 19
VB
47µF
2.2MΩ
4.7µF
Vcc
0.1µF
30kΩ
18kΩ 4.3kΩ
0.1µF
0.05µF
0.01µF
SKG
14
SKO
15
47µF
ܰ
25Ω
+20
+10
0
-10
-20
-30
-40
-50
-60
-70
Fig 2 Transmit attenuator versus RTX
Max Gain
Vacf=6.0mV
Max Attenuation
Vacf=150mV
RR=30k ohms
VLC=VB
10k
100k
RTX (ohms)
Fig 1 Test circuit
+20
+10
0
-10
-20
-30
-40
-50
-60
-70
Fig 3 Receive attenuator versus RRX
Max Gain
Vacf=6.0mV
RR=30k ohms
VLC=VB
Max Attenuation
Vacf=150mV
Usable range
1M
1k
10k
RRX (ohms)
100k
+20
+10
0
-10
Fig 4 Gain and attenuation versus
Resisrtor Ratio
GRX vs RRX/RR
Vacf=150mV
GTX vs RTX/RR
Vacf=6.0mV
-20
-30
-40
-50
-60
ARX vs RRX/RR
Vacf=6.0mV
VLC=VB
ATX vs RTX/RR
Vacf=150mV
-70
0.1
1.0
10
Ratio
+10
0
-10
-20
Fig 5 Attenuation Gain versus VLC
RRX=18k ohms
RTX=91k ohms
RR=30k ohms
GTX
GRX
Circuit in
receive
mode
-30
-40
0
0.2
0.4
Mimimum
recommended
level
0.6
0.8
1.0
YOUW ANG ELECTRONICS CO.LTD
11
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet UTC34018.PDF ] | |
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