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7
KX-TG7331CAM/KX-TG7331CAT/KX-TGA731RUM/KX-TGA731RUT/KX-TGA731RUC/KX-TGA731RUS
4 Technical Descriptions
4.1.
Block Diagram (Base Unit)
Analog
Front
End
T
o TEL_LINE
Bridge
Rect
D3D3
Hook Switch
Q3, Q4Q3,
Q4
Audio
Bell/Caller ID
Interface
CPU
24
22
29
26
27
25
30
BELL
HOOK
Off-Hook Line Voltage
31
A/D
D/A
ADPCM
Codec Filter
DSP
Speech Encoding
Speech Decoding
BMC
Burst Encoding
Burst Decoding
RF
PLL
5
3
97
95
9
10
EEPROM
SCL
SDA
67
68
54
16
17
15
14
85
To AC Adaptor
Limit
Resistor
Charge
Detector
CHARGE
CONTACT
(Optional)
VUNREG
3.0V
Reg.
IC1
2.4V
Reg.
Q401
1.8V
Reg.
Q8
3.0 V
2.4 V
1.8 V
BBIC
IC401
TAM Companion IC
MIC
SP
IC201
IC7
MOD/DEMOD
Charge
Pump
53
2.5V
X
T
A
L
X
1
X1
10
.3
68
M
H
z
IC801
R
X
n
R
X
p
T
X
p
T
X
n
P
on
P
S
E
L
V
DD
-P
A
D
R
V
4
3
6
7
T
X
on
R
X
on
D
801
D802
6
92
AN
T1
AN
T2
9
8
ANT1
AN
T2
R
F
P
A
ANT1
AN
T2
98
93
94
100
L
1
L2
L1
L2
2
91
0
1
1
1
2
2
3
SPI_DI
SPI_DO
SPI_CLK
SPI_EN
RST
14
16
27
31
KX-TG7331 BLOCK DIA
GRAM
(BASE UNIT)
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