MC34018-S28-T [UTC]
VOICE SWITCHED SPEAKER-PHONE CIRCUIT; 话音切换免提电话线路
| 型号： | MC34018-S28-T |
| 厂家： | 
Unisonic Technologies |
| 描述： | VOICE SWITCHED SPEAKER-PHONE CIRCUIT |
| 文件： | 总8页 (文件大小：303K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
MC34018
LINEAR INTEGRATED CIRCUIT
VOICE SWITCHED
SPEAKER-PHONE CIRCUIT
DESCRIPTION
The UTC MC34018 speaker-phone integrated circuit includes all
the active circuitry and control functions to implement a high quality
hands-free telephone system. The circuit includes a microphone
amplifier, a speaker amplifier, level detectors, a background sound
level monitoring system in both the transmit and receive channels
and an attenuation system which can control the transmit and
receive levels as well as the background level.
The applications include household and office speaker-phones,
intercom systems, hand free kit for mobile phones, and others.
FEATURES
* Chip Select pin for Power conservation (active/standby mode).
* Integrated all necessary active circuitry for a hand-free telephone
into one single chip.
*Pb-free plating product number:MC34018L
* Operating under wide dynamic range through signal compression
technology.
* Build-In voltage regulators illuminate external regulators for lining
operation.
* Monitoring system for background noise level.
* Background sound level compensation for transmit and
receive levels as well as the background level.
* Power audio amplifier for typical 100mW output (into 25Ω) with
peak limiting for speaker to minimize distortion.
* Volume control function for external volume control circuit.
ORDERING INFORMATION
Order Number
Package
Packing
Normal
Lead Free Plating
MC34018-D28-T
MC34018-E28-T
MC34018-R28-R
MC34018-R28-T
MC34018-S28-R
MC34018-S28-T
MC34018L-D28-T
MC34018L-E28-T
MC34018L-R28-R
MC34018L-R28-T
MC34018L-S28-R
MC34018L-S28-T
DIP-28
SDIP-28
SSOP-28
SSOP-28
SOP-28
SOP-28
Tube
Tube
Tape Reel
Tube
Tape Reel
Tube
MC34018L-D28-T
(1) R: Tape Reel, T: Tube
(1)Packing Type
(2)Package Type
(3)Lead Plating
(2) D28: DIP-28, E28: SDIP-28, S28: SOP-28,
R28: SSOP-28
(3) L: Lead Free Plating, Blank: Pb/Sn
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Copyright © 2005 Unisonic Technologies Co., Ltd
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MC34018
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
RR
RTX
TXI
28
RRX
RXI
1
2
27
26
25
24
23
22
21
20
19
18
17
16
15
RXO
ACF
VLC
3
TXO
TLI
4
5
TLO
RLI
XDC
6
7
GND
VB
RLO
MCI
MCO
CP1
CP2
XDI
8
9
VCC
SKI
CS
10
11
12
13
14
AGC
V+
SKG
SKO
PIN DESCRIPTION
PIN NO. PIN NAME
DESCRIPTION
1
2
3
4
RR
RTX
TXI
A resistor to ground provides a reference current for the transmit and receive attenuators
A resistor to ground determines the nominal gain of the transmit attenuator, the transmit
channel gain is inversely proportional to RTX resistance.
Transmit Attenuator Input, Input resistance is nominally 5.0kΩ.
Transmit Attenuator Output, The TXO output signal drivers the input of transmit level
detcetor, as well as the external circuit which drivers the telephone line.
Transmit Level detector Input. An external resistor ac coupled to The TLI pin sets the
detection level. Decreasing this resistor increases the sensitivity to transmit channel
signals.
TXO
5
TLI
Transmit Level detector Output. The external resistor and capacitor set the time the
comparator will hold the system in the transmit mode after speech ceases.
Receive Level detector Input. An external resistor ac coupled to The RLI pin sets the
detection level. Decreasing this resistor increases the sensitivity to receive channel signals.
Receive Level detector Output. The external resistor and capacitor set the time the
comparator will hold the system in the receive mode after speech ceases.
Microphone amplifier input. Input impedance is nominally 10kΩ and the dc bias voltage is
6
7
8
TLO
RLI
RLO
9
MCI
approximately equal to VB
10
MCO
Microphone amplifier output. The MIC amp gain is internally set at 34dB (50V/V).
A parallel resistor and capacitor connected between this pin and VCC holds a voltage
corresponding to the background noise level. The transmit detector compares the CP1
voltage with the speech signal from CP2.
11
CP1
A capacitor at this pin peak detects the speech signals for comparison with the background
noise level held at CP1.
12
13
14
CP2
XDI
Input to the transmit detector system. The microphone amplifier output is ac coupled to the
XDI pin through an external resistor.
High current ground pin for the speaker amplifier output stage. The SKG voltage should be
within 10mV of the ground voltage at pin 22.
SKG
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MC34018
LINEAR INTEGRATED CIRCUIT
PIN DESCRIPTION(Cont.)
PIN NO. PIN NAME
DESCRIPTION
Speaker amplifier output. The SKO pin will source and sink up to 100mA when ac coupled
to the speaker. The speaker amplifier gain is internally set at 34dB (50V/V).
Input DC supply voltage. V+ can be powered from Tip and Ring if an ac decoupling
inductor is used to prevent loading ac line signals. The required V+ voltage is 6.0V to 11V
(7.5V nominal) at 7.0mA.
15
SKO
16
V+
A capacitor from this pin to VB stabilizes the speaker amplifier gain control loop, and
additionally controls the attack and decay time of this circuit. The gain control loop limits the
speaker amplifier input to prevent clipping at SKO. The internal resistance at AGC pin is
nominally 110kΩ.
17
AGC
Digital chip select input. When at a logic "0" (<0.7V) the VCC regulator is enabled. When at
a logic "1" (>1.6V),the chip is in the standby mode drawing 0.5mA.An open CS pin is a
logic "0".Input impedance is nominally 140k ohms. The input voltage should not exceed
11V.
18
19
CS
Input to the speaker amplifier. Input impedance is nominally 20kΩ.
SKI
A 5.4V regulated output which powers all circuits except the speaker amplifier output stage.
VCC can be used to power external circuitry such as a microprocessor(3.0mA max.) A filter
20
VCC
capacitor is required. The UTC MC34018 can be powered by a separate regulated supply
by connecting V+ and VCC to a voltage between 4.5V and 6.5V while maintaining CS at a
logic "1".
An output voltage equal to approximately VCC/2 which series as an analog ground for the
speakerphone system. Up to 1.5mA of external load current may be sourced from VB.
Output impedance is 250 ohms. A filter capacitor is required.
21
22
VB
GND
Ground pin for the IC(except the speaker amplifier)
Transmit detector output. A resistor and capacitor at his pin hold the system in the transmit
mode during pauses between words or phrases. When the XDC pin voltage decays to
ground, the attenuators switch from the transmit mode to idle mode. The internal resistor at
XDC is nominally 2.6k ohms(see Fig.1).
23
XDC
Volume control input>connecting this pin to the slider of a variable resistor provides receive
mode volume control. The VLC pin voltage should be less than or equal to VB.
Attenuator control filter. A capacitor connected to this pin reduces noise transient as the
attenuator control switches level of attenuation.
24
25
VLC
ACF
Receive attenuator Output. Normally this pin is ac coupled to the input of the speaker
amplifier.
Receive attenuator Input. Input impedance is nominally is 5.0kΩ.
26
27
28
RXO
RXI
A resistor to ground determines the nominal gain of the receive attenuator. The receive
channel gain is directly proportional to the RRX resistance.
RRX
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LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
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LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Ta=25℃, Voltage referred to pin 22.)
PARAMETER SYMBOL
RATINGS
+12, -1.0
+12, -1.0
+3.0, -1.0
+VCC, -1.0
-65 ~ +150
UNIT
V
V+ terminal Voltage (pin 16)
CS (pin 18)
V
Speaker amplifier Ground(pin 14)
VLC(pin 24)
V
V
Storage temperature
TSTG
°C
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
RATINGS
+6.0 ~ +11
0 ~ +11
UNIT
V
V+ Terminal Voltage (pin 16)
CS (pin 18)
V
VLC (pin 24)
0.55VB ~ VB
0 ~ 250
V
Receive Signal(pin 27)
Microphone Signal(pin 9)
Speaker Amplifier Ground (pin 14)
ICC (pin 20)
mVrms
mVrms
mVdc
mA
0 ~ 5.0
-10 ~ +10
0 ~ 3.0
Ambient Temperature
TA
-20 ~ +60
°C
TEMPERATURE CHARACTERISTICS (-20 ~+60℃)
PARAMETER
PIN
16
TYP CHANGE
-0.2
UNIT
%/°C
%/°C
%/°C
dB/°C
%/°C
dB/°C
dB/°C
%/°C
nA/°C
V+ Supply Current ( V+ 11V,Pin 18 = 0.7V )
V+ Supply Current(V+ 11V,Pin 18 = 1.6V )
VCC Voltage( V+ = 7.5V )
16
-0.4
20
+0.1
Attenuator Gain ( Max and Min Setting )
Delta RXO,TXO Voltage
±0.003
±0.24
±0.001
±0.4
4,26
15,19
9,10
9
Speaker AMP Gain
Microphone AMP Gain
Microphone Amp Input Resistance
Tx-Rx Switching Threshold (20μA)
+0.4
5,7
±0.2
ELECTRICAL CHARACTERISTICS (Referred to Fig.1)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
4.9
TYP
MAX UNIT
SUPPLY VOLTAGES
VCC Voltage
VCC
ΔVCCLN
VD
V+=7.5V
5.4
65
5.9
150
300
3.3
9.0
Vdc
mV
mV
Vdc
mA
Line Regulation
Dropout Voltage
VB Voltage
6.5V<V+<11V
V+=5.0V
80
VB
V+=7.5V
2.5
2.9
V+=11V,Pin 18=0.7V
V+ Supply Current
IV+
V+=11V,Pin 18=1.6V
ICC=3mA
800
20
μA
Ω
Output Resistance
6.0
ROUT
ROUT
Ω
Output Resistance
ATTENUATORS
Receive Attenuator Gain
(1.0kHz)
IB=1.7mA
250
GRX
ΔGRX
GRI
2.0
40
6.0
44
10
48
dB
dB
dB
Rx Mode, Pin 24= VB
Pin 27 = 250Mvrms
Range (Rx to Tx Modes)
Idle Mode, Pin 27= 250mVrms
-20
-16
-12
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MC34018
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (Cont.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
1.8
TYP
2.3
MAX UNIT
RXO Voltage (Rx Mode)
Delta RXO Voltage
(Switch from Rx to Tx Mode)
RXO Sink Current (Rx mode)
RXO Source Current (Rx mode)
RXI Input Resistance
VRXO
3.2
mV
ΔVRXO
100
mV
IRXOL
IROXH
RRXI
75
1.0
3.5
μA
mA
kΩ
3.0
8.0
5.0
2.3
Rx Attenuator Gain, Rx Mode,
0.6VB<Pin 24<VB
Volume Control Range
VCR
24.5
32.5
dB
ATTENUATORS
TXO Voltage (Tx mode)
Delta TXO Voltage (switch from
Tc to Rx Mode)
VTXO
1.8
3.2
Vdc
mV
ΔVTXO
100
Rx Mode
Tx Mode
Idle Mode
150
6.0
75
mV
mV
mV
dB
ACF Voltage (VCC-Pin 25
Voltage)
ΔVACF
Transmit Attenuator Gain(1.0kHz)
Tx Mode, Pin 3 = 250mVrms
Range, (Tx to Rx Mode)
Idle Mode, Pin 3 = 250Mvrms
TXO Sink Current (Tx mode)
TXO Source Current (Tx mode)
TXO Input Resistance
GTX
4.0
40
6.0
44
8.0
48
ΔGTX
dB
GTXI
-16.5
-13
-8.5
dB
ISINK
ISOURCE
RIN
75
1.0
3.5
μA
mA
kΩ
3.0
8.0
5.0
SPEAKER AMPLIFIER
Speaker Amp Gain
GSPK
RIN
Pin 19 = 20mVrms
33
15
34
22
35
37
dB
kΩ
SKI Input Resistance
SKO Voltage
VO(SKO)
Pin 19 =Cap couple to GND
Pin 19 = 0.1V, -100mA Load at
Pin 15
2.4
3.0
3.6
Vdc
High
VSKOH
VSKOL
5.5
Vdc
mV
SKO Voltage
Low
Pin 19=0.1V
+100mA Load at Pin 15
600
MICROPHONE AMPLIFIER
Microphone Amp Gain
Microphone Amp Input
Resistance
Pin 9 = 10mVrms,1KHz
GMCI
RMCI
32.5
6.5
34
10
35
16
dB
kΩ
LOGAMPS
RLO
Leakage Current
TLO
Pin 8 = VB+1.0V
2.0
2.0
μA
μA
ILEAK
ITH
Pin 6 = VB+1.0V
Transmit-Receive Switching
Threshold
Ratio of ITLI to IRLI - at 20μA -to
Switch Tx-Rx Comparator)
0.8
5.0
1.2
TRANSMIT DETECTOR
Idle Mode
XDC Voltage
0
Vdc
Vdc
μA
VXDC
ICP2
Tx Mode
4.0
10
CP2 Current Source
Distortion
13
Rx Mode, RXI to SKO
Tx Mode, MCI to TXO
RXD
TXD
Pin 27 = 10mVrms,1KHz
Pin 9 = 5mVrms,1KHz
1.5
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, Ta=25°C.
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MC34018
LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
TRANSMIT
OUTPUT
DC line input
Receive input
0.068
13
F
1000
F
4.7
F
47 F
4.7k
10
12
CP2
11
CP1
23
XDC
18
CS
16
V+
VB
MCO XDI
MIC
12k
59k
Vcc
0.05
F
transmit
detector comp
VCC
regulator
Vcc
5.4V
47
F
2.6k
9
20
MIC AMP
MCI
0.1
F
2k
VB
22
Vth
(36mV)
GND
AGC
VB
3.3k
F
TLI
33k
56k
VB
5
6
500
0.068
1.0
F
Attenuator
control
VB
17
TRANSMIT
LOG AMP
peak
limiter
TLO
RECEIVE/TRANSMIT
COMP
Vcc
Speaker
amp
Vcc
transmit
attenuator
receive
attenuator
RTI
500
7
VB
regulator
4.7k
VB
RECEIVE
AMP
RLO
2.2M
VB
21
VLC ACF
24 25
TXI RTX RR
TXO RXI
27
RRX
28
RXO SKI
SKG
14
SKO
15
0.068
F
8
3
2
1
4
26
19
VB
47
F
30k
18k
4.3k
47
F
4.7 F
1.0
F
Vcc
0.05
F
25
0.1
F
0.1 F
0.01
F
Fig 1 Test circuit
BASIC LINE POWERED SPEAKERPHONE
Fig 2
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MC34018
LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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