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6
KX-TG7207UA/KX-TG7208UA/KX-TGA720UA
4 Technical Descriptions
4.1.
Block Diagram (Base Unit)
KX-TG7207/7208 BLOCK DIA
G
RAM
(BASE UNIT)
Analog
Front
End
To TEL_LINE
A
B
CN1
Bridge
Rect
D3 D3
Hook Switch
Q
4
,Q
5
Audio
Bell/Caller ID
Interface
Charge
Detector
CPU
59
54
61
52
60
56
55
BELL
HOOK
(Optional)
Off-Hook Line Voltage
64 ADCO
A/D
D/A
ADPCM
Codec Filter
DSP
Speech Encoding
BMC
Burst Encoding
RF
Interface
18
19
TXDA
RXDA
21
20
22
SYCL
SYDA
SYEN
ANT1
ANT2
RF Module
18
16
2
31
21
14
13
12
12
13
XTAL
X
1
10.368
MHz
EEPROM
SCL
SDA
6
5
7
To AC Adaptor
CN2
Limit
Resistor
CHARGE
CONTACT
VUNREG
3.3V
Reg.
IC
1
2.5V
Reg.
Q
9
1.8V
Reg.
Q
8
3.3 V
2.5 V
1.8 V
BBIC
IC5
IC7
IC10
Speech Decoding
Burst Decoding
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