Panasonic KX-UDT121RU (serv.man4) Service Manual ▷ View online
13
KX-UDT121RU
4.2.11. RF Circuit
Reception
A digital voice signal from LAN is received as "TX_DATA" (*1) by DMW in a cell station.
Then TX_DATA goes to RF part, and it's modulated to 1.9 GHz RF signal. The RF signal is amplified and fed to a selected
antenna by antenna diversity .
Then TX_DATA goes to RF part, and it's modulated to 1.9 GHz RF signal. The RF signal is amplified and fed to a selected
antenna by antenna diversity .
As for a portable station, RF signal of cell station is received in two antennas.
RFIC(IC1) of portable station compares RF signal levels from cell station and selects the antenna to be used.
RX signal in the selected antenna is amplified and down-converted to 864 kHz IF signal, then demodulated to digital data
"RX_DATA".
RFIC(IC1) converts RX_DATA into a voice signal and outputs it to speaker.
RFIC(IC1) of portable station compares RF signal levels from cell station and selects the antenna to be used.
RX signal in the selected antenna is amplified and down-converted to 864 kHz IF signal, then demodulated to digital data
"RX_DATA".
RFIC(IC1) converts RX_DATA into a voice signal and outputs it to speaker.
Transmission
A voice signal from microphone is encoded to digital data "TX_DATA" by RFIC(IC1) in a portable station.
TX_DATA goes to RF part, and it's modulated to 1.9 GHz RF signal. The RF signal is amplified and fed to a selected antenna by
antenna diversity.
TX_DATA goes to RF part, and it's modulated to 1.9 GHz RF signal. The RF signal is amplified and fed to a selected antenna by
antenna diversity.
As for a cell station, RF signal is received in two antennas.
RFIC of cell station compares RF signal levels from portable station and selects the antenna to be used.
RX signal in the selected antenna is amplified and down-converted to 864 kHz IF signal, then demodulated to digital data
"RX_DATA".
DMW is received RX_DATA (*1) as a voice signal from portable station and outputs it to LAN.
RFIC of cell station compares RF signal levels from portable station and selects the antenna to be used.
RX signal in the selected antenna is amplified and down-converted to 864 kHz IF signal, then demodulated to digital data
"RX_DATA".
DMW is received RX_DATA (*1) as a voice signal from portable station and outputs it to LAN.
Note:
(*1) TX_DATA and RX_DATA are bundled to one signal as "RXTXDATA" of DMW in cell station.
TX_RF
RX_RF
TX_RF
RX_RF
VBAT_3.0V
LNA_INN
ANT2
ANT1
RX_SW
TX_SW
BAL_OUT1
RSTN
BAL_OUT2
GND
LNA_INP
VCC_PA
C19
ATSTN
ATSTP
C1
C21
C3
IC1
38
TEST
39
RX_SW
40
LNA_INN
26
XIN
27
VDD_APU
28
VBAT_APU
29
VDD_IF
30
VCC_FE_IF
31
VCC_PA
32
BAL_OUT2
33
BAL_OUT1
41
LNA_INP
42
ATST_N
43
ATST_P/EXT_LNA
44
RSTN
45
VCC_VCO
46
ON_OFF
47
ON_OFF_OUT
48
IF_T_DATA
49
IF_MLSE
50
IF_RX1
51
IF_NPORST
IF_INT_ANA
IF_EN_DA
IF_EN_AD
IF_DATA_DA
IF_DATA_AD
IF_CLK_PLL
IF_CLK_IF
IF_CDC_DIR
IF_EN_DA
IF_EN_AD
IF_DATA_DA
IF_DATA_AD
IF_CLK_PLL
IF_CLK_IF
IF_CDC_DIR
36
GND_RF
37
ANT2
34
TX_SW
35
ANT1
IF_NARES
TO RF BLOCK
C49
GND
GND
GND
GND
GND
C48
ANT_TP1
1
2
GND
GND
GND
GND
LNA_INN
GND
GND
RX_SW
GND
GND
C44
LNA_INP
BAL_OUT1
ANT1
C50
ANT_TP2
1
2
ANT2
BAL_OUT2
GND
GND
GND
VCC_PA
C36
TX_SW
GND
C51
L40
GND
C39
C43
C31
L32
D51
D50
GND
GND
CL1
CL2
CL3
C52
GND
GND
L38
L42
L33
C47
C41
C53
L34
C34
C35
C37
C32
C30
C55
L30
L31
C42
L36
C45
C46
L35
L39
C33
GAP
GAP
Antenna diversity
14
KX-UDT121RU
4.2.12. Bluetooth Circuit
Technical Description for BT unit
1. WHEN IP DATA FOR INCOMING SIGNAL ENTERS FROM IP LINE
a. If KX-UDT121 doesn’t have the registered Bluetooth (BT) Headset, the BT module(IC601) doesn’t work and the BT Head-
set function can’t use.
b. If KX-UDT121 has the registered Bluetooth Headset,
IC100 (BBIC) inform “incoming call” data to the BT Module by serial Communication (RF/IF)
The BT module inform “incoming call” data to the BT Headset by radio transmission.
It is as follows and, specifically, the BT Module generates the radio transmission data and the is radiated.
The BT module inform “incoming call” data to the BT Headset by radio transmission.
It is as follows and, specifically, the BT Module generates the radio transmission data and the is radiated.
c. BT Headset detected “incoming call Data”.
BT Headset tells the operator having received a message in “Incoming call”.
2. WHEN A CALLING IS MADE BY THE BLUETOOTH(BT) HEADSET
a. When the operator of BT Headset switches STANDBY to TALK,
TALK mode data enters KX-UDT121 and it is demodulated at the BT module of KX-UDT121.
b. Voice signal is connected between IC100(BBIC) and BT module in a PCM Format.
The item of the following explains the operation of transmission and receiver.
3. BT MODULE UNIT RECEIVER OPERATION
BT RF signal is received by a single pattern antenna.
4. BT MODULE UNIT TRANSMISSION OPERATION
BT RF signal is transmitted by a single pattern antenna.
Rx_Data
Rx_RF
Tx_Data
Tx_RF
GND
BT3.0V
C601
BT3.0V
R602
GND
R603
R605
R606
R607
BT3.0V
GND
Q601
Q602
ANT_BT
1
2
GND
SPI_MOSI
SPI_CSB
SPI_MISO
SPI_CLK
GND
L41
L601
IC601
14
RESETB
19
RF
20
GND8
21
GND9
22
GND10
23
GND11
29 USB_D+
30 USB_D-
31 PCM_IN
32 PCM_CLK
30 USB_D-
31 PCM_IN
32 PCM_CLK
4
GND2
5
CTS
6
RX
7
GND3
11
SPI_CSB
12
SPI_MISO
13
SPI_CLK
16
GND5
17
GND6
18
GND7
26 GND12
27 VCC
28 GND13
27 VCC
28 GND13
1
GND1
2
PCM_SYNC
3
PCM_OUT
8
RTS
9
TX
10
SPI_MOSI
15
GND4
25 PIO2
24 PIO1
GAP
BT_ANT
Bluetooth Unit
15
KX-UDT121RU
4.2.13. TX Audio Path
Microphone
An audio signal from microphone is input to pin 14 (MIC+) and pin 13(MIC-) of IC.
In IC1, the audio signal is converted from the analog signal to ADPCM, then to burst data, and sent to RF cricuit.
The stabilized supply voltage is fed to the microphone from pin 17 (MPWR) of IC1.
To reduce consumption current, this voltage is supplied only while calling or receiving.
In IC1, the audio signal is converted from the analog signal to ADPCM, then to burst data, and sent to RF cricuit.
The stabilized supply voltage is fed to the microphone from pin 17 (MPWR) of IC1.
To reduce consumption current, this voltage is supplied only while calling or receiving.
Headset
When a headset is inserted, a signal from microphone is cut off and an audio signal from a headset is input to pin 17(HSMIP) of
IC1.
IC1.
Headset detection
When a headset is inserted, pin 89 (USB_DP/GPI29) of IC100 goes from High to Low and BBIC (IC100) detects the insertion of
the headset.
the headset.
CHG_CUR
COUNT
GND
C302
C301
C307
NC
GNDA
GND
GNDA
C10
C12
C11
NC
GND
BATTERY
VBAT_MON
GNDA
C306
NC
VBG
GND
C305
L2
DC
C4
NC
VCCA
C23
R7
R300
R6
C6
C14
C19
C5
C15
R8
R9
DOUT3.0V
RA300
1
23
4
R3
C9
C2
C21
L22
L1
C13
IC1
1
DOUBCAPP2
2
DOUBCAPN1
18
SPOUTP
3
DOUBCAPP1
4
DOUT3V0
5
DOUT4V5
6
DOUT2V5/DCIN0/LIN0
7
LEDSINK2/DCIN1
8
DCIN2
19
VCCPA
20
SPOUTN
21
HSSPOUTP
22
LOUT
23
PWM0
24
DCINS
25
XOUT
38
TEST
39
RX_SW
40
LNA_INN
69
GND
9
DCIN3/LIN1
10
LEDSINK1/PWM1
11
VREF
12
VCCA
13
MIN
14
MIP
15
HSMIN
16
HSMIP
26
XIN
27
VDD_APU
28
VBAT_APU
29
VDD_IF
30
VCC_FE_IF
31
VCC_PA
32
BAL_OUT2
33
BAL_OUT1
41
LNA_INP
42
ATST_N
43
ATST_P/EXT_LNA
44
RSTN
45
VCC_VCO
46
ON_OFF
47
ON_OFF_OUT
48
IF_T_DATA
49
IF_MLSE
50
IF_RX1
51
IF_NPORST
53
IF_INT_ANA
54
IF_EN_DA
55
IF_EN_AD
56
IF_DATA_DA
57
IF_DATA_AD
58
IF_CLK_PLL
59
IF_CLK_IF
60
IF_CDC_DIR
61
IF_CDC_DAT_DA
62
IF_CDC_DAT_AD
63
IF_BAT_OK
64
VDD_ADIF
65
VDDCORE
66
COREOUT
67
VBAT
68
DOUBCAPN2
36
GND_RF
37
ANT2
17
MPWR
34
TX_SW
35
ANT1
52
IF_NARES
C40
CHG_DET
VIB_CTRL
VIB_CTRL
C326
NC
C313
D301
NC
D300
NC
GND
C328
GND GND
GND GND
C327
NC
C314
NC
SP-PHONE_SPEAKER
+
-
C321
L302
C316
C320
C322
L303
L300
C16
NC
GND
GND
VBAT_3.0V
VBAT_3.0V
GNDA
GNDA
GNDA
GNDA1 GNDA1 GNDA1
GNDA1
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
SPP
SPM
MIC+
MIC-
GNDA
GND
GND
GND
GND
GND
L305
L304
L301
C325
GNDA
VCCA
HEADSET_DET
VCCA
C17
NC
R14
R301
R305
R304
R302
R303
R317
R314
D304
D305
D302
D303
R308
R309
C315
C18
CN301
1
4
2
3
3
5
C311
NC
REV-
REV+
C312
NC
RA301
1
2
3
4
4
R306
C310
C319
NC
C318
NC
ZA2
1
4
ZA3
1
2
2
3
2
3
4
C331
R316
R320
NC
X1
13.824M
1
2
4
3
MIC
AP1
1
2
2
C54
L21
R321
C324
C323
C317
MIC POWER
RECEIVER+
RECEIVER-
HEADSET_DET
Headset_MIC+
Speakerphone_SP+
Speakerphone_SP-
MIC+
MIC-
Headset_RECEIVER
Receiver
16
KX-UDT121RU
4.2.14. RX Audio Path
Receiver
Burst data is input from RF cricuit to IC1.
In IC1, the burst data is converted to ADPCM, then to analog signal, and sent from pin 21 (HSSPOUTP) and pin 22 (LOUT) to
the receiver via headset jack (CN301) .
In IC1, the burst data is converted to ADPCM, then to analog signal, and sent from pin 21 (HSSPOUTP) and pin 22 (LOUT) to
the receiver via headset jack (CN301) .
Headset
When the headset is inserted, a signal to the receiver is cut off and audio signal from pin 22 (LOUT) of IC1 is input to the head-
set.
set.
Speakerphone
In Speakerphone mode, an audio signal from pin 18 (SPOUTP) and 20(SPOUTN) of IC1 is sent to a monitor speaker.
CHG_CUR
COUNT
GND
C302
C301
C307
NC
GNDA
GND
GNDA
C10
C12
C11
NC
GND
BATTERY
VBAT_MON
GNDA
C306
NC
VBG
GND
C305
L2
DC
C4
NC
VCCA
C23
R7
R300
R6
C6
C14
C19
C5
C15
R8
R9
DOUT3.0V
RA300
1
23
4
R3
C9
C2
C21
L22
L1
C13
IC1
1
DOUBCAPP2
2
DOUBCAPN1
18
SPOUTP
3
DOUBCAPP1
4
DOUT3V0
5
DOUT4V5
6
DOUT2V5/DCIN0/LIN0
7
LEDSINK2/DCIN1
8
DCIN2
19
VCCPA
20
SPOUTN
21
HSSPOUTP
22
LOUT
23
PWM0
24
DCINS
25
XOUT
38
TEST
39
RX_SW
40
LNA_INN
69
GND
9
DCIN3/LIN1
10
LEDSINK1/PWM1
11
VREF
12
VCCA
13
MIN
14
MIP
15
HSMIN
16
HSMIP
26
XIN
27
VDD_APU
28
VBAT_APU
29
VDD_IF
30
VCC_FE_IF
31
VCC_PA
32
BAL_OUT2
33
BAL_OUT1
41
LNA_INP
42
ATST_N
43
ATST_P/EXT_LNA
44
RSTN
45
VCC_VCO
46
ON_OFF
47
ON_OFF_OUT
48
IF_T_DATA
49
IF_MLSE
50
IF_RX1
51
IF_NPORST
53
IF_INT_ANA
54
IF_EN_DA
55
IF_EN_AD
56
IF_DATA_DA
57
IF_DATA_AD
58
IF_CLK_PLL
59
IF_CLK_IF
60
IF_CDC_DIR
61
IF_CDC_DAT_DA
62
IF_CDC_DAT_AD
63
IF_BAT_OK
64
VDD_ADIF
65
VDDCORE
66
COREOUT
67
VBAT
68
DOUBCAPN2
36
GND_RF
37
ANT2
17
MPWR
34
TX_SW
35
ANT1
52
IF_NARES
C40
CHG_DET
VIB_CTRL
VIB_CTRL
C326
NC
C313
D301
NC
D300
NC
GND
C328
GND GND
GND GND
C327
NC
C314
NC
SP-PHONE_SPEAKER
+
-
C321
L302
C316
C320
C322
L303
L300
C16
NC
GND
GND
VBAT_3.0V
VBAT_3.0V
GNDA
GNDA
GNDA
GNDA1 GNDA1 GNDA1
GNDA1
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
SPP
SPM
MIC+
MIC-
GNDA
GND
GND
GND
GND
GND
L305
L304
L301
C325
GNDA
VCCA
HEADSET_DET
VCCA
C17
NC
R14
R301
R305
R304
R302
R303
R317
R314
D304
D305
D302
D303
R308
R309
C315
C18
CN301
1
4
2
3
3
5
C311
NC
REV-
REV+
C312
NC
RA301
1
2
3
4
4
R306
C310
C319
NC
C318
NC
ZA2
1
4
ZA3
1
2
2
3
2
3
4
C331
R316
R320
NC
X1
13.824M
1
2
4
3
MIC
AP1
1
2
2
C54
L21
R321
C324
C323
C317
MIC POWER
RECEIVER+
RECEIVER-
HEADSET_DET
Headset_MIC+
Speakerphone_SP+
Speakerphone_SP-
MIC+
MIC-
Headset_RECEIVER
Receiver
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