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KX-TG2511RUM/KX-TG2511RUN//KX-TG2511RUS/KX-TG2511RUT/KX-TG2512RUN/KX-TG2512RUS/KX-TG2521RUT/KX-TGA250RUM/KX-TGA250RUN/KX-TGA250RUS/KX-TGA250RUT
throughthe circuit). Following signal flow is the DC current flow.
T
T
D101 Q141 Q161 R168 D101 P101 R
ON HOOK Circuit:
Q141 is open, Q141 is connected as to cut the DC loop current and to cut the voice signal. The unit is consequently in an on-
hook condition.
hook condition.
Pulse Dial Circuit:
Pin 6 of BBIC turns Q141 ON/OFF to make the pulse dialing.
Side Tone Circuit:
Basically this circuit prevents the TX signal from feeding back to RX signal. As for this unit, TX signal feed back from Q161 is
canceled by the canceller circuit of BBIC.
canceled by the canceller circuit of BBIC.
5.4.5.
Power Supply Circuit
[Changed from original section “4.4.5. Power Supply Circuit”]
The power supply voltage from AC adaptor is converted to VBAT (3.0V) in 3.0V DC/DC Converter (IC301,Q301) and +3.0V for
peripherals and analog part is insulated from VBAT by Doubler of BBIC.
Circuit Operation:
peripherals and analog part is insulated from VBAT by Doubler of BBIC.
Circuit Operation:
6.5V
VB AT
RSTN(Reset)
pin 54
VB AT
pin 10
pin 57
pin 9
pin 15
IC501
IC301,Q301
IC601
BBIC
DOUBLER OUT
F or pe ripherals
F or pe ripherals
VDDC (1.2V)
AC Adaptor
3.0V
DC/DC
CONVERTER
DC/DC
CONVERTER
FLASH
IC611
EEP R OM
+3.0V
STM/CKM
Recei ve
Amp.
RF P art
Sta rtmonitor
(IC501 57pin)
VDDC (1.2 V)
VB AT
Reset (RSTN)
(IC501_54 pin)
(IC501_54 pin)
BBIC chip initiali ze
(CKM/STM)
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