UTC MC34018 LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R108-006,A
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 f
or 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.
UTC MC34018 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM
RECEIVE VOLUME CONTROL
PIN CONFIGURATIONS
PIN NAME DESCRIPTION
1 RR A resistor to ground provides a reference current for the transmit and receive attenuators
2 RTX A resistor to ground determines the nominal gain of the transmit attenuator ,the transmit channel gain
is inversely proportional to RTX resistance.
3 TXI Input to the transmit attenuator. Input resistance is nominally 5.0k ohms.
4 TXO Output of the transmit attenuator. The TXO output signal drivers the input of transmit level detcetor,
as well as the external circuit which drivers the telephone line.
5 TLI Input of the transmit level detector. An external resistor ac coupled to The TLI pin sets the dete
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level. Decreasing this resistor increases the sensitivity to transmit channel signals.
6 TLO Output of the transmit level detector. The external resistor and capacitor set the time the comparator
will hold the system in the transmit mode after speech ceases.
7 RLI Input of the receive level detector. An external resistor ac coupled to The RLI pin sets the detection
level. Decreasing this resistor increases the sensitivity to receive channel signals.
8 RLO Output of the receive level detector. The external resistor and capacitor set the time the comparator
will hold the system in the receive mode after speech ceases.
9 MCI Microphone amplifier input. Input impedance is nominally 10k ohms and the dc bias voltage is
approximately equal to VB
excel筛选很好的英文10 MCO Microphone amplifier output. The MIC amp gain is internally set at 34dB(50V/V).
11 CP1 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.
12 CP2 A capacitor at this pin peak detects the speech signals for comparison with the background noise
level held at CP1.
13 XDI Input to the transmit detector system. The microphone amplifier output is ac coupled to the XDI pin
生物育种through an external resistor.
UTC UNISONIC TECHNOLOGIES CO., LTD. 2
QW-R108-006,A
UTC MC34018 LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R108-006,A
ELECTRICAL CHARACTERISTICS (referred to fig. 1)
PARAMETER SYMBOL MIN TYP MAX UNIT
SUPPLY VOLTAGES
V+ Supply Current V+=11V,Pin 18=0.7V V+=11V,Pin 18=1.6V I V+
9.0 800 mA µA VCC Voltage(V+=7.5V) Line
Regulation(6.5V<V+<11V) Output Resistance(I CC =3mA) Dropout Voltage(V+=5.0V) Vcc ∆Vcc LN Ro Vcc Vccsat 4.9
5.4 65
6.0 80 5.9 150 20 300 Vdc mV ohms mV VB Voltage(V+=
7.5V) Output Resistance(I B =1.7mA)
Vb Rovb
2.5
2.9 250
3.3
Vdc ohms
UTC MC34018 LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R108-006,A
(continued)
PARAMETER SYMBOL MIN TYP MAX UNIT
ATTENUATORS
Receive Attenuator Gain(1.0kHz) Rx Mode, Pin 24= VB, Pin 27 = 250Mvrms Range (Rx to Tx Modes) Idle Mode, Pin 27= 250mVrms G RX ∆G RX G RI 2.0 40 -20 6.0 44 -16 10 48 -12 dB
dB dB
RXO Voltage (Rx Mode) V RXO 1.8 2.3 3.2 mV
Delta RXO Voltage (Switch from Rx to Tx Mode)
∆V RXO 100 mV
RXO Sink Current (Rx mode) I RXOL 75
µA RXO Source Current (Rx mode) I ROXH 1.0 3.0 mA RXI Input Resistance R RXI 3.5 5.0 8.0 k Ω
Volume Control Range (Rx Attenuator Gain, Rx Mode, 0.6VB<Pin 24<VB
驾考科目四V CR
24.5 32.5 dB ATTENUATORS
Transmit Attenuator Gain (1.0kHz) Tx Mode, Pin 3 = 250mVrms Range, (Tx to Rx Mode) Idle Mode, Pin 3 = 250Mvrms G TX ∆G TX G TXI 4.0 40 -16.5 6.0 44 -13 8.0 48 -8.5 dB
dB dB
TXO Voltage (Tx mode) V TXO 1.8 2.3 3.2 Vdc
千仞雪最后嫁给了谁Delta TXO Voltage (switch from Tc to Rx Mode)
∆V TXO 100 mV
TXO Sink Current (Tx mode) I TXOL 75
µA TXO Source Current (Tx mode) I TXOH 1.0 3.0 mA TXO Input Resistance R TXI 3.5 5.0 8.0 k Ω
ACF Voltage (VCC-Pin 25 Voltage) Rx Mode Tx Mode Idle Mode ∆V ACF 150 6.0 75
mV mV
mV
SPEAKER AMPLIFIER Speaker Amp Gain (pin 19 = 20mVrms)
G SPK 33 34 35 dB SKI Input Resistance R SKI 15 22 37 k Ω SKO Voltage ( Pin 19 =Cap couple to GND)
V SKO 2.4 3.0 3.6 Vdc SKO High Voltage ( Pin 19 = 0.1V, -100mA Load at Pin 15)
V SKOH 5.5 Vdc SKO Low Voltage (pin 19=0.1V, +100mA Load at Pin 15) V SKOL 600 mV MICROPHONE AMPLIFIER Microphone Amp Gain ( Pin 9 = 10mVrms,1KHz) G MCI 32.5 34 35 dB Microphone Amp Input Resistance R MCI 6.5 10 16 k Ω
UTC MC34018 LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD.
5
QW-R108-006,A
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.
TEMPERATURE CHARACTERISTICS (-20 TO +60°C )
PARAMETER PIN TYP CHANGE UNIT
V+ Supply Current ( V+ 11V,Pin 18 = 0.7V )
16 -0.2 %/°C V+ Supply Current(V+ 11V,Pin 18 = 1.6V ) 16 -0.4 %/°C VCC Voltage( V+ = 7.5V )
20 +0.1 %/°C Attenuator Gain ( Max and Min Setting ) +-0.003 dB/°C Delta RXO,TXO Voltage 4,26 +-0.24 %/°C Speaker AMP Gain 15,19 +-0.001 dB/°C Microphone AMP Gain
9,10 +-0.4 dB/°C Microphone Amp Input Resistance 9 +0.4
%/°C Tx-Rx Switching Threshold (20µA) 5,7 +-0.2
nA/°C
DESIGN GUIDELINES (REF TO FIG. 1)
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,
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