Panasonic KX-TCD650RUC / KX-TCD650RUF Service Manual ▷ View online
77..33.. R
RFF M
MO
OD
DU
ULLE
E
B
BLLO
OC
CK
K D
DIIA
AG
GR
RA
AM
M R
RFF M
MO
OD
DU
ULLE
E
Fig. 22
Loop
filter
CHP
VCO
x2
PD
:R
:N/A
32/33
PLL &
control logic
S&H
Demodulator
Printed
balun
Printed
balun
Printed
PMB6819
Power amp.
DRON
RXON
RX Part
TX Part
voltage
regulator
voltage
regulator
VCC1
VCC
VCC2
Low IF
band pass
filter
VCC
VCC1
TXDA
SYRI
SYDA
SYCL
SYCL
RXDSG
RXDA
RSSI
SYEN
3.3V
PMB6610
DECT transceiver
PAON
PAON
Diversity
Switching
ANT1
ANT2
ANT2
RF1
RF2
7
7..33..11.. R
RFF M
MO
OD
DU
ULLE
E ((S
SE
EE
E B
BLLO
OC
CK
K D
DIIA
AG
GR
RA
AM
M FFiigg..2222))
The RF Module consists of two main components: the PMB6610 transceiver and the PMB6819 power amp.
In the transceiver the 10.368MHz clock signal SYCL is multiplied to around 1.9GHz using PLL (Phase Locked Loop) control.
The TXDA signal is used to control the modulation of this frequency to 1.87GHz to 1.93GHz.
Received signals are demodulated, filtered and sent to the BBIC via the RXDA line.
The RSSI (Radio Signal Strength Indicator) signal enables the implementation of diversity switching whereby two antennae can
be mounted in different orientations and their signals compared. The one with better reception can be selected by the BBIC
using the ANT1 and ANT2 lines.
In the transceiver the 10.368MHz clock signal SYCL is multiplied to around 1.9GHz using PLL (Phase Locked Loop) control.
The TXDA signal is used to control the modulation of this frequency to 1.87GHz to 1.93GHz.
Received signals are demodulated, filtered and sent to the BBIC via the RXDA line.
The RSSI (Radio Signal Strength Indicator) signal enables the implementation of diversity switching whereby two antennae can
be mounted in different orientations and their signals compared. The one with better reception can be selected by the BBIC
using the ANT1 and ANT2 lines.
17
KX-TCD650RUC / KX-TCD650RUF
B
BLLO
OC
CK
K D
DIIA
AG
GR
RA
AM
M
88 C
CIIR
RC
CU
UIITT O
OP
PE
ER
RA
ATTIIO
ON
N ((H
HA
AN
ND
DS
SE
ETT))
CPU
PMB6720
IC1
IC1
A/D
D/A
Analog
Front
End
Front
End
Speech Encoding
Speech Decoding
Burst Encoding
Burst Decoding
DSP
ADPCM
Codec
Filter
BMC
RF
Interface
Interface
SPEAKER
MIC
BUZZER
PL0...PL24, PL32...PL35
EEPROM
IC2
VDDA
SDA
SCL
64
65
38
5
6
8
SYRI
RSSI
SYEN
RXDA
TXDA
14
10
47
21
11
RF
Section
Section
ANT
RX-AF
TX-AF
BATTERY
TERMINAL
TERMINAL
J1
J2
CHARGE
CIRCUIT
CHARGE
SENSE
SWITCHED
SUPPLY
CHARGE
CONTACTS
CONTACTS
J3
J4
3.6V
2.65V
Reg.
2.65V
VDDBAT
SENSE
SWITCH
SWITCH
32
30
XTAL
10.368
MHz
KEYPAD
COLUMNS
ROWS
PY0...PY4
PX0...PX4
LCD
7 Seg.
Display
7 Seg.
Display
ON SWITCH
40
RX-AF 41
44
68
68
87
49
28
35
26
24
Fig. 23
Internal
MASK
ROM
MASK
ROM
KX-TCD650RUC/RUF BLOCK DIAGRAM (HANDSET)
18
KX-TCD650RUC / KX-TCD650RUF
88..11.. TTH
HE
E B
BA
AS
SE
E B
BA
AN
ND
D S
SE
EC
CTTIIO
ON
N
88..11..11.. IIN
NTTR
RO
OD
DU
UC
CTTIIO
ON
N
The base-band section consists of a base-band integrated circuit (BBIC), an EEPROM, an LCD Display, a Microphone, an
Earpiece, and power supply/battery management circuits.
Earpiece, and power supply/battery management circuits.
88..11..22.. TTH
HE
E B
BA
AS
SE
E--B
BA
AN
ND
D IIN
NTTE
EG
GR
RA
ATTE
ED
D C
CIIR
RC
CU
UIITT ((B
BB
BIIC
C))
The PMB6720 (IC1) is a CMOS device designed to handle all the audio, signal and data processing needed in a DECT handset.
It contains a "burst mode controller" which takes care of DECT specific physical layer and radio section control. It also contains
an ADPCM codec filter used for speech encoding and decoding in the DSP section, a general purpose microcontroller, various
other ADC´s, DAC´s, timers and power control circuitry.
The BBIC connects to the EEPROM (IC2) via a serial interface (SDA and SDC). This serial interface is also used during
manufacture and service to connect to an external computer.
It contains a "burst mode controller" which takes care of DECT specific physical layer and radio section control. It also contains
an ADPCM codec filter used for speech encoding and decoding in the DSP section, a general purpose microcontroller, various
other ADC´s, DAC´s, timers and power control circuitry.
The BBIC connects to the EEPROM (IC2) via a serial interface (SDA and SDC). This serial interface is also used during
manufacture and service to connect to an external computer.
88..11..33.. E
EE
EP
PR
RO
OM
M ((S
SE
EE
E FFiigg.. 2244))
The electrically erasable PROM IC2 is used to store all the temporary operating parameters for the handset (see E
EE
EP
PR
RO
OM
M
LLA
AY
YO
OU
UTT). It used a two-line serial data interface with the BBIC, with bi-directional data on IC2 pin5 (TP52), and a 45 kHz clock
on pin6 (TP53).
88..11..44.. FFA
AC
CTTO
OR
RY
Y S
SE
ER
RIIA
ALL P
PO
OR
RTT ((S
SE
EE
E FFiigg.. 2244))
In order to communicate with the handset during manufacture and servicing (using a PC) a serial data link has been provided.
Serial data input/output is provided through the I2DAT input (pin 64). The data is clocked through using the I2CLK pin (65). Test
probe pads SDA and SDC are provided for external connection.
A Ground reference solder pad is also provided.
Serial data input/output is provided through the I2DAT input (pin 64). The data is clocked through using the I2CLK pin (65). Test
probe pads SDA and SDC are provided for external connection.
A Ground reference solder pad is also provided.
19
KX-TCD650RUC / KX-TCD650RUF
Fig. 24
20
KX-TCD650RUC / KX-TCD650RUF
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