Panasonic KX-TG2511UAM / KX-TG2511UAN / KX-TG2511UAS / KX-TG2511UAT / KX-TG2512UAM / KX-TG2512UAT / KX-TGA250RUM / KX-TGA250RUN / KX-TGA250RUS / KX-TGA250RUT (serv.man5) Service Manual / Supplement ▷ View online
9
6 Technical Descriptions
6.1.
Block Diagram (Base Unit)
[Changed from original section “4.1. Block Diagram (Base Unit)”]
D101
CHARGE_CONT
A
C
T
+
-
X501
13.824 MHz
ANT
1
TEL J
A
CK
L1R
L1T
DCP
DCM
DC J
A
CK
SIDE T
O
NE
CIRCUIT
Q161
Q141
BELL
DETECT
HOOK
BELL
Q111
LIN
LOUT
RF_P
A
R
T
HSMIP
HSMIN
IC501
BBIC
RECEIVE
AMP
DCIN 1 and 3
IC301,
Q301
VCCP
A
VBA
T_APU
VBA
T
VCC_FE
VCC_IF
VCC_VCO
DCINS
CHARGE_DET
3.0V
DOUBOUT
SCL, SDA
WP
VCC
LCD_BL T
IC601
IC611
SW1
Q171
DI,CS
KEYIN 1
KEYS_C
DC/DC
CONVER
TER
CLK,DO
STM/CKM
R371
R372
D362
Q701, Q702
CHARGE
DETECT
VCCA
VCC
SCL,RST
CS
,CD,SIO
DCIN 2
CAP
_SW
CAP_CHG
TG2521 only
ANT2
ANT1
RXp
RXn
RXON
TXp
TXn
TXON
RESET
RSTN
IN USE
DETECT 2
R150, R152
FLASH
MEMOR
Y
VBA
T
EEPR
O
M
MEMOR
Y
HS_SUPPL
Y_DET
KX-TG2511 BLOCK DIA
G
RAM
(BASE UNIT)
RL
Y
10
6.2.
Circuit Operation (Base Unit)
6.2.1.
Outline
Base Unit consists of the following ICs as shown in Block Diagram (Base Unit) (P.9).
• DECT BBIC (Base Band IC): IC501
- Handling all the audio, signal and data processing needed in a DECT base unit
- Controlling the DECT specific physical layer and radio section (Burst Module Controller section)
- ADPCM code filter for speech encoding and speech decoding (DSP section)
- Echo-cancellation and Echo-suppression (DSP section)
- Any tones (tone, sidetone, ringing tone, etc.) generation (DSP section)
- DTMF receiver (DSP section)
- Clock Generation for RF Module
- ADC, DAC, timer, and power control circuitry
- PLL Oscillator
- Detector
- Compress/Expander
- First Mixer
- All interfaces (ex: QSPI FLASH MEMORY, EEPROM, LED, Analog Front End, etc.)
- Integrated 1.9GHz PA for DECT
- Controlling the DECT specific physical layer and radio section (Burst Module Controller section)
- ADPCM code filter for speech encoding and speech decoding (DSP section)
- Echo-cancellation and Echo-suppression (DSP section)
- Any tones (tone, sidetone, ringing tone, etc.) generation (DSP section)
- DTMF receiver (DSP section)
- Clock Generation for RF Module
- ADC, DAC, timer, and power control circuitry
- PLL Oscillator
- Detector
- Compress/Expander
- First Mixer
- All interfaces (ex: QSPI FLASH MEMORY, EEPROM, LED, Analog Front End, etc.)
- Integrated 1.9GHz PA for DECT
• EEPROM: IC611
- Temporary operating parameters (for RF, etc.)
• Additionally,
- Power Supply Circuit (+3.0 V output)
- Crystal Circuit (13.824 MHz)
- Charge Circuit
- Crystal Circuit (13.824 MHz)
- Charge Circuit
- Telephone Line Interface Circuit
11
6.3.
Block Diagram (Base Unit RF Part)
RXp
RXn
ANT1
TXp
TXn
KX-TG2511 BLOCK DIAGRAM (Base Unit_RF Part)
12
6.4.
Circuit Operation (Base Unit)
General Description:
(BBIC, Flash Memory, EERROM) is a digital speech/signal processing system that implements all the functions of speechcom-
pression, record and playback, and memory management required in a digital telephone answering machine.The BBIC system
is fully controlled by a host processor. The host processor provides activation and control of all that functions as follows.
pression, record and playback, and memory management required in a digital telephone answering machine.The BBIC system
is fully controlled by a host processor. The host processor provides activation and control of all that functions as follows.
6.4.1.
BBIC (Base Band IC: IC501)
• Voice Message Recording/Play back
The BBIC system uses a proprietary speech compression technique to record and store voice message in Flash Memory.An
error correction algorithm is used to enable playback of these messages from the Flash Memory.
error correction algorithm is used to enable playback of these messages from the Flash Memory.
• DTMF Generator
When the DTMF data from the handset is received, the DTMF signal is output.
• Synthesized Voice (Pre-recorded message)
The BBIC implements synthesized Voice, utilizing the built in speech detector and a Flash Memory, which stored the vocabulary.
• Caller ID demodulation
The BBIC implements monitor and demodulate the FSK/DTMF signals that provide CID information from the Central Office.
• Digital Switching
The voice signal from telephone line is transmitted to the handset or the voice signal from the handset is transmitted to theTele-
phone line, etc. They are determined by the signal path route operation of voice signal.
phone line, etc. They are determined by the signal path route operation of voice signal.
• Block Interface Circuit
RF part, LED, Key scan, Speaker, Telephone line.
6.4.2.
EEPROM (IC611)
Following information data is stored.
• Settings
ex: message numbers, ID code, Flash Time, Tone/Pulse
6.4.3.
Telephone Line Interface
Telephone Line Interface Circuit:
Function
Function
• Bell signal detection
• ON/OFF hook and pulse dial circuit
• Side tone circuit
• ON/OFF hook and pulse dial circuit
• Side tone circuit
Bell signal detection and OFF HOOK circuit:
In the idle mode, Q141 is open to cut the DC loop current and decrease the ring load. When ring voltage appears at the Tip (T)
and Ring (R) leads (When the telephone rings), the AC ring voltage is transferred as follows:
R
and Ring (R) leads (When the telephone rings), the AC ring voltage is transferred as follows:
R
P101 R111 C111 Q111 BBIC pin 5
When the CPU (BBIC) detects a ring signal, Q141 turns on, thus providing an off-hook condition (active DC current flow
throughthe circuit). Following signal flow is the DC current flow.
T
throughthe circuit). Following signal flow is the DC current flow.
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.
RF part
ADPCM
Analog
Front
End
Front
End
&
Multi-
plexer
Multi-
plexer
TEL
Line
Interface
Line
Interface
Digital
Speech
Processor
Speech
Processor
Caller ID
Modem
Modem
Digital TAM System
Flash Memory IC601
Host CPU
BBIC (IC501)
DECT RF system
TDMA/TDD
Mod/Demod
PA/LNA
TDMA/TDD
Mod/Demod
PA/LNA
ADPCM
SW1/ Charge
EEPROM IC611
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