Panasonic KX-TPA65RU / KX-TPA65RUB Service Manual ▷ View online
13
KX-TPA65RU/KX-TPA65RUB
4.3.9.
RF Circuit
Reception
Base unit receives voice signal as "RX_DATA" from LAN and modurates it to RF signal in 1.9GHz.
RF signal is amplified and fed to Base unit's antenna.
RF signal is amplified and fed to Base unit's antenna.
RF signal from Base unit is received in two antennas in TPA65 and input to Main MPU(IC1).
RF parts of Main MPU(IC1) selects the antenna to be used and demodulates RF signal to digital data "RX_DATA"
Main MPU(IC1) sends RX_DATA to Sub MPU(IC2) in TDM.
Sub MPU(IC2) converts RX_DATA into a voice signal and output it to selected Audio Path.
RF parts of Main MPU(IC1) selects the antenna to be used and demodulates RF signal to digital data "RX_DATA"
Main MPU(IC1) sends RX_DATA to Sub MPU(IC2) in TDM.
Sub MPU(IC2) converts RX_DATA into a voice signal and output it to selected Audio Path.
Transmission
A voice signal from Audio Path is encoded to digital data "TX_DATA" by Sub MPU(IC2) in TPA65.
TX _DATA is sent from Sub CPU(IC2) to Main CPU(IC1) in TDM.
RF parts of Main MPU(IC1) modulates TX _DATA to RF signal in 1.9GHz.
RF signal is amplified and fed to a selected antenna.
TX _DATA is sent from Sub CPU(IC2) to Main CPU(IC1) in TDM.
RF parts of Main MPU(IC1) modulates TX _DATA to RF signal in 1.9GHz.
RF signal is amplified and fed to a selected antenna.
Base unit receives RF signal from TPA65 and demodulates it to digital data "TX_DATA".
Main MPU(IC1) has LNA, Power AMP, RF-Switch and baseband processing function.
Filtering of RF signal and matching for antenna are in RF Block.
Filtering of RF signal and matching for antenna are in RF Block.
Antenna divesity
DG
D3.2V
L101
51
VCC_PA
52
BAL_OUT2
53
BAL_OUT1
55
ANT1
56
GND_RF
57
ANT2
58
TEST
59
RX_SW
60
LNA_INN
61
LNA_INP
ATST_N
54
TX_SW
C422
RX_SW
LNA_INN
LNA_INP
C423
R402
C421
DG
DG
DG
C430
BAL_OUT2
C419
C417
VCC_PA
L411
C411
C418
TX_SW
BAL_OUT1
R401
DG
DG
DG
DG
DG
DG
DG
L410
NC
C416
C415
C429
C412
D402
ANT1
D401
ANT2
DG
DG
DG
DG
DG
DG
DG
DG
DG
DG
ANT_TP1
1
2
ANT_JP1
1 2
1 2
ANT_1
C425
DG
DG
DG
DG
DG
ANT_JP2
ANT_TP2
1
2
ANT_2
C427
DG
C420
C410
L416
DG
C405
C404
L403
C403
L402
C402
L401
C401
L414
L412
C424
C409
L406
C408
C407
L405
L404
C406
L415
0
C426
IC1
RF Block
TX_SW
VCC_PA
ANT1
ANT2
ANT2
RX_SW
LNA_INN
LNA_INP
LNA_INP
BAL_OUT2
BAL_OUT1
BAL_OUT1
14
KX-TPA65RU/KX-TPA65RUB
4.3.10.
TX Audio Path
Audio Path in IC2 is controlled by IC1 with depending on Headset detection or Hook detection.
And it is swithed alternately as below with holding down "SP-phone" key.
And it is swithed alternately as below with holding down "SP-phone" key.
Pin 27(MPWR) of IC2 supply each microphone line through one's RC-filter.
IC2 convets the analog signal in selected Audio Path to PCM data and sent it to IC1 in TDM.
Handset(Handset Monitor)
IC2 convets the analog signal in selected Audio Path to PCM data and sent it to IC1 in TDM.
Handset(Handset Monitor)
RC-Filter consists of R306 and C311.
An audio signal from Handset is input to pin 26(HSMIP) and pin 25(HSMIN) of IC2.
An audio signal from Handset is input to pin 26(HSMIP) and pin 25(HSMIN) of IC2.
SP-phone
RC-Filter consists of R311 and C313.
An audio signal from microphone is input to pin 24 (MIP) and pin 23(MIN) of IC2.
An audio signal from microphone is input to pin 24 (MIP) and pin 23(MIN) of IC2.
Headset
RC-Filter consists of R310 and C312.
An audio signal from Headset is input to pin 16(LIN0) of IC2.
An audio signal from Headset is input to pin 16(LIN0) of IC2.
Headset detection
When a headset is inserted, pin 26 (DCIN0) of IC1 goes from High to Low and IC1 detects the insertion of the headset.
Hook detection
When a handset is off the hook, pin 28 (DCIN2) of IC1 goes from High to Low and IC1 detects that.
Status
Audio Path
Hook Headset
HI
HI
Handset
Handset Monitor
HI
LOW
Handset
Headset
LOW
HI
SP-phone
-
LOW
LOW
-
Headset
LINO
VCCA
C216
C303
0.1u
C304
0.1u
C324
R309
R311
AG
C310
R305
AG
C309
R310
AG
R312
HEADGND
C321
C325
R313
C318
C316
AG
AG
JK3
Headset Jack
1
4
2
3
3
5
C314
AG
C317
AG
C315
L303
NC
L304
NC
C322
C319
C305
C306
AG
C220
1u
R317
R318
R320
AG
C219
L301
L305
L302
C217
JK2
1
2
3
4
2
3
4
5
SP-
SP+
R316
AG
R308
R307
R315
AG
AG
C302
0.1u
C301
0.1u
R301
3.3k
R302
3.3k
R304
3.3k
R303
3.3k
C308
AG
C307
C323
DG
DG
DG
DG
DG
DG
DG
DG
C326
C327
AG
MICM
HSMIC-
HSMIC+
MICP
HSSP-
SPM
SPP
HDSP
HDMIC
HSSP+
AG
MIC1
1
2
R322
VCCA
L306
25
HSMIN
26
HSMIP
27
MPWR
28
SPOUTP
29
VCCPA
30
SPOUTN
31
HSSPOUTP
32
LOUT
28
DCIN2
26
DCIN0
23
MIN
24
MIP
16
DOUT2V5/DCIN0/LIN0
17
LEDSINK2/DCIN1
18
DCIN2
19
DCIN3/LIN1
20
LEDSINK1/PWM1
21
VREF
22
VCCA
R319
D303
D304
D301
D309
HEADGND
D310
D311
D312
HEADGND
HEADGND
HEADGND HEADGND
HEADGND
D308
D307
L308
L310
L309
HEADGND
AG
D306
D305
C215
C339
C320
C340
R306
R333
R334
C312
C313
C311
AG
IC2
IC1
DG
SW1
1
2
3
4
5
6
R319
D3.2V
L108
15
KX-TPA65RU/KX-TPA65RUB
4.3.11.
RX Audio Path
Audio Path in IC2 is controlled by IC1 with depending on Handset detection or Hook detection as discussed in the chapter 4.5.10.
PCM data from IC1 is converted to audio signal in IC2 and it is output to selected Audio path.
Handset
PCM data from IC1 is converted to audio signal in IC2 and it is output to selected Audio path.
Handset
An audio signal from Base unit is out put from pin 31(HSSPOUTP) of IC2 to the receiver via Handset jack (JK2).
Handset Monitor
An audio signal from Base unit is out put from pin 31(HSSPOUTP) of IC2 to the receiver via Handset jack (JK2).
In addition, An audio signal from Handset is out put from pin 28(SPOUTP) and pin 30(SPOUTN) of IC2 to the Speaker terminal.
In addition, An audio signal from Handset is out put from pin 28(SPOUTP) and pin 30(SPOUTN) of IC2 to the Speaker terminal.
SP-phone
An audio signal from Base unit is out put from pin 28(SPOUTP) and pin 30(SPOUTN) of IC2 to the Speaker terminal.
Headset
An audio signal from Base unit is out put from pin 32(LOUT) of IC2 to the receiver via Handset jack (JK3).
LINO
VCCA
C216
C303
0.1u
C304
0.1u
C324
R309
R311
AG
C310
R305
AG
C309
R310
AG
R312
HEADGND
C321
C325
R313
C318
C316
AG
AG
JK3
Headset Jack
1
4
2
3
3
5
C314
AG
C317
AG
C315
L303
NC
L304
NC
C322
C319
C305
C306
AG
C220
1u
R317
R318
R320
AG
C219
L301
L305
L302
C217
JK2
1
2
3
4
2
3
4
5
SP-
SP+
R316
AG
R308
R307
R315
AG
AG
C302
0.1u
C301
0.1u
R301
3.3k
R302
3.3k
R304
3.3k
R303
3.3k
C308
AG
C307
C323
DG
DG
DG
DG
DG
DG
DG
DG
C326
C327
AG
MICM
HSMIC-
HSMIC+
MICP
HSSP-
SPM
SPP
HDSP
HDMIC
HSSP+
AG
MIC1
1
2
R322
VCCA
L306
25
HSMIN
26
HSMIP
27
MPWR
28
SPOUTP
29
VCCPA
30
SPOUTN
31
HSSPOUTP
32
LOUT
28
DCIN2
26
DCIN0
23
MIN
24
MIP
16
DOUT2V5/DCIN0/LIN0
17
LEDSINK2/DCIN1
18
DCIN2
19
DCIN3/LIN1
20
LEDSINK1/PWM1
21
VREF
22
VCCA
R319
D303
D304
D301
D309
HEADGND
D310
D311
D312
HEADGND
HEADGND
HEADGND HEADGND
HEADGND
D308
D307
L308
L310
L309
HEADGND
AG
D306
D305
C215
C339
C320
C340
R306
R333
R334
C312
C313
C311
AG
IC2
IC1
DG
SW1
1
2
3
4
5
6
R319
D3.2V
L108
16
KX-TPA65RU/KX-TPA65RUB
4.3.12.
Audio path between IC1 and IC2
Audio signal is transmitted as PCM data in TDM between IC1 and IC2.
TDM_TXD is the data from Base unit in RX audio path.
TDM_RXD is the data to Base unit in TX audio path.
IC2 is master for TDM and makes TDM_SCK and TD_FSYNC.
TDM_TXD is the data from Base unit in RX audio path.
TDM_RXD is the data to Base unit in TX audio path.
IC2 is master for TDM and makes TDM_SCK and TD_FSYNC.
IC1
72
71
70
74
R120
R119
R108
R211
IC2
63
61
59
60
TDM_SCLK
TDM_FSYNC
TDM_RXD
TDM_TXD
TDM_TXD
TDM_RXD
TDM_FSYNC
TDM_SCK
125us
2.3MHz
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