13
KX-TG9581B/KX-TG9582B/KX-TGA950B
4.2.2.6.
Power supply(1.8V) :VDD5
This power supply consist of IC601and Q701 for CPU CORE and Memory on BBIC IC701.
4.2.3.
Telephone Line Interface
Note:
[ ]: Line 2
<Function>
• Bell signal detection
• Clip signal detection
• ON/OFF hook circuit
Bell & Clip (: Calling Line Identification Presentation: Caller ID) signal detection:
In the standby mode, Q101 [Q201] is open to cut the DC loop current and decrease the ring load.
When ring voltage appears at the L1T (A) [L2T (C)] and L1R (B) [L2R (D)] leads (when the telephone rings), the AC ring voltage is
transferred as follows;
ON/OFF hook circuit:
In the standby mode, Q101 [Q201] is open, and connected as to cut the DC loop current and to cut the voice signal. The unit is
consequently in an
on-hook condition
.
When IC601 [IC701] detects a ring signal or press the TALK Key onto the portable, Q102 [Q202] turns on and then Q101, [Q201,
PC201] turns on, thus providing an
off-hook condition
(DC current flows through the circuit) and the following signal flow
makes the loop current.
A [C]
→
D101 [D201]
→
Q101 [Q201]
→
Q103 [Q203]
→
R108 [R208]
→
D101 [D201]
→
B [D]
4.2.4.
Transmitter/Receiver
• Audio Circuits and DTMF tone signal circuits.
Base unit and portable mainly consist of RF and DECT BBIC.
Base unit and portable transmit/receive voice signal and data signal through the antenna on carrier frequency.
Signal Path:
4.2.4.1.
Transmitter Block
The voice signal input from the TEL LINE 1 interface goes to RF ,through DECT BBIC (IC601) as shown in
The voice signal input from the TEL LINE 2 interface goes to RF though SlaveBBIC(IC701) and BBIC(Master : IC601) as shown in
BlockDiagram.
The voice signal passes through the analog part of IC601 [IC701] where it is amplified and converted to a digital audio stream
signal. The burst switch controller processes this stream performing encryption and scrambling, adding the various other fields
to produce the GAP (
G
eneric
A
ccess
P
rofile) standard DECT frame, assigning to a time slot and channel etc.
In IC601, the carrier frequency is changing, and frequency modulated RF signal is generated and amplified, and radiated from
antenna. Portable detects the voice signal or data signal in the circuit same as the following explanation of Receiver Block.
C703
K1u
R702
10k
R703
270
S_+1.8V
Q701
VDD5
25
P3_3/ADC0
P1_0/INT0/ADC1
23
VDD/AVD
24
LDO_CTRL
19
MICh
20
VREFm
21
LSRp
22
LSRn
VBAT
R723
56k
C720
680p
A [C] - C125 [C227] - R121 [R22
3
] - IC601 (H1) [IC701 (15)] (Clip)
B [D] - C127 [C225] - R12
3
[R221] - IC601 (H2) [IC701 (17)] (Clip)
-- IC601(J2)[IC701(18)] - R6
3
7[R725] - R6
3
6[R726] - IC601(F
3
)[IC701(12)] -(Bell)
