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Part Name
Description
MC34018L-E28-T View Datasheet(PDF) - Unisonic Technologies
Part Name
Description
Manufacturer
MC34018L-E28-T
VOICE SWITCHED SPEAKERPHONE CIRCUIT
Unisonic Technologies
MC34018L-E28-T Datasheet PDF : 8 Pages
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MC34018
TEST CIRCUIT
LINEAR INTEGRATED CIRCUIT
TRANSMIT
OUTPUT
V
B
MIC
12k
0.05
F
9
2k
0.1 F
MCI
3.3k
0.068 F
5
TLI
V
B
6
TLO
4.7k
0.068 F
7
RTI
V
B
0.068 F
4.7k
4.7 F
47 F
DC line input
1000 F
Receive input
10 13
MCO XDI
59k
12
CP2
MIC AMP
V
B
500
TRANSMIT
LOG AMP
V
B
33k
56k
Attenuator
control
11
CP1
transmit
detector comp
23
XDC
Vcc
2.6k
18
CS
VCC
regulator
Vth
(36mV)
peak
limiter
16
V+
Vcc
47 F
5.4V
20
22
GND
AGC
17
V
B
1.0 F
RECEIVE/TRANSMIT
COMP
Vcc
500
VB
regulator
transmit
attenuator
receive
attenuator
Vcc
Speaker
amp
RECEIVE
AMP
RLO
VB VLC ACF TXI RTX RR TXO RXI RRX RXO SKI
SKG
SKO
8
21 24 25 3 2 1 4 27 28 26 19
14
15
1.0 F
VB
47 F
4.7 F
30k
2.2M
Vcc
0.1 F
0.1 F
18k 4.3k
0.05
F
0.01
F
47 F
25
Fig 1 Test circuit
BASIC LINE POWERED SPEAKERPHONE
Fig 2
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
7 of 8
QW-R108-006,C
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