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UTCMC34018 Datasheet(数据表) 2 Page - Unisonic Technologies

部件型号  UTCMC34018
说明  VOICE SWITCHED SPEAKER-PHONE CIRCUIT
下载  14 Pages
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制造商  UTC [Unisonic Technologies]
网页  http://www.utc-ic.com
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UTCMC34018 Datasheet(HTML) 2 Page - Unisonic Technologies

 
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UTCMC34018 LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD. 2
QW-R108-006,A
BLOCK DIAGRAM
MIC AMP
TRANSMIT
ATTENUATOR
SIGNAL/NOISE
DETECTOR
ATTENUATOR
CONTROL
TRANSMIT/
RECEIVE
COMPARATOR
TRANSMIT LEVEL
DETECTOR
RECEIVE
ATTENUATOR
RECEIVE LEVEL
DETECTOR
SPEAKER
AMP
PEAK LIMITER
VCC
REGULATOR
SIDE TONE
NETWORK
RECEIVE
CHANNEL
TRANSMIT
CHANNEL
TRANSMIT
OUTPUT
RECEIVE INPUT
DC INPUT
RECEIVE VOLUME CONTROL
ENABLE INPUT
TELEPHONE
LINE
SIDE
TONE
MIC
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 detection
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
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
through an external resistor.




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