Panasonic KX-TGH210UAB / KX-TGH212UAB / KX-TGH220UAB / KX-TGHA20RUB Service Manual ▷ View online
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KX-TGH210UAB/KX-TGH212UAB/KX-TGH220UAB/KX-TGHA20RUB
4.2.
Circuit Operation (Base Unit)
4.2.1.
Outline
Base Unit consists of the following ICs as shown in Block Diagram (Base Unit) (P.8).
• 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.)
• FLASH MEMORY: IC601 (for KX-TGH220 only)
- Voice Prompt (TAM) D/L Area
- ICM/OGM Recording Area
- ICM/OGM Recording Area
• Additionally,
- Power Supply Circuit (+3.0 V, +1.8 V output)
- Crystal Circuit (10.368 MHz)
- Charge Circuit
- Telephone Line Interface Circuit
- Crystal Circuit (10.368 MHz)
- Charge Circuit
- Telephone Line Interface Circuit
• QSPI FLASH MEMORY IC502
- Main Program D/L Area
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KX-TGH210UAB/KX-TGH212UAB/KX-TGH220UAB/KX-TGHA20RUB
4.3.
Block Diagram (Base Unit RF Part)
KX-TGH210/220 BLOCK DIAGRAM (Base Unit_RF Part)
RXp
RXn
ANT1
TXp
TXn
(DA802)
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KX-TGH210UAB/KX-TGH212UAB/KX-TGH220UAB/KX-TGHA20RUB
4.4.
Circuit Operation (Base Unit)
General Description:
(BBIC, Flash Memory, EERROM) is a digital speech/signal processing system that implements all the functions of
speechcompression, 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 functionsas
follows.
speechcompression, 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 functionsas
follows.
4.4.1.
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
theTelephone line, etc. They are determined by the signal path route operation of voice signal.
theTelephone 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.
4.4.2.
Flash Memory (IC601)(for KX-TGH220 only)
Following information data is stored.
• Voice signal
ex: Pre-recorded Greeting message, Incoming message
4.4.3.
EEPROM (IC611)
Following information data is stored.
• Settings
ex: message numbers, ID code, Flash Time, Tone/Pulse
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
Keys/ LEDs/ Charge
EEPROM IC611
Speaker
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KX-TGH210UAB/KX-TGH212UAB/KX-TGH220UAB/KX-TGHA20RUB
4.4.4.
Power Supply Circuit
The power is supplied to the DECT BBIC, QSPI FLASH MEMORY, FLASH MEMORY, EEPROM and Charge Contact from AC
Adaptor (+5.5 V) as shown in Fig.101. The power supply is as follows;
Adaptor (+5.5 V) as shown in Fig.101. The power supply is as follows;
• DECT BBIC (IC501):
DC Jack (+5.5 V)
IC302 IC501
DC Jack (+5.5 V)
IC302 Q301 IC501
• EEPROM (IC611):
DC Jack (+5.5 V)
IC302 IC501 IC611
• FLASH MEMORY (IC601) (for KX-TGH220 only):
DC Jack (+5.5 V)
IC302 IC501 IC601
• Charge Contact (CHARGE+):
DC Jack (+5.5 V)
R371 R372 D362 CHARGE+
• QSPI FLASH MEMORY (IC502):
DC Jack (+5.5 V)
IC302 Q301 IC502
<Fig.101>
DC Jack
3.0V
REGULATOR
IC302
+5.5 V
+5.5 V
+ 3.0 V
+ 3.0 V
VDD3
VDD4
IC501
EEPROM
IC611
BBIC
Q301
+ 1.8 V
QSPI FLASH
IC502
TAM FLASH
VDD5
+ 3.0V_CP
+ 3.0V_CP2
IC601
RF Part
LEDs
VDD5
R371
R372
R362
CHARGE +
AC Adaptor
1
2
3
On
DC
S
1.8 V
Reset
(IC501(RSTN))
Off
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