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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.)
- DCDC Converter
- Integrated 1.9GHz PA for DECT

• EEPROM: IC611

- Temporary operating parameters (for RF, etc.)

• FLASH MEMORY: IC601 (for KX-TG8561 only)

- Voice Prompt (TAM) D/L Area
- ICM/OGM Recording Area

• Additionally,

- Power Supply Circuit (+3.0 V, +2.4 V, +1.8 V output)
- Crystal Circuit (10.368 MHz)
- Charge Circuit
- Telephone Line Interface Circuit

• QSPI FLASH MEMORY IC502

- Main Program D/L Area

10

KX-TG8551/8561 BLOCK DIAGRAM (Base Unit_RF Part)

DA801

ANT2

ANT1

TXON

RXON

RXp

RXn

ANT2

ANT1

TXp

TXn

11

(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 functionsas follows.

• 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.

• 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.

• Block Interface Circuit

RF part, LED, Key scan, Speaker, Telephone line.

Following information data is stored.

• Voice signal

ex: Pre-recorded Greeting message, Incoming message

Following information data is stored.

• Settings

ex: message numbers, ID code, Flash Time, Tone/Pulse

RF part

ADPCM

Analog
Front
End

&
  
Multi-
plexer

TEL
Line
Interface

Digital
Speech
Processor

Caller ID
Modem

Digital TAM  System

Flash Memory  IC601

 Host CPU

DECT RF system
 TDMA/TDD
 Mod/Demod
 PA/LNA

ADPCM

Keys/ LEDs/ Charge

EEPROM IC611

12

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;

• DECT BBIC (IC501): 

DC Jack (+5.5 V) 

→ IC302 → IC501

DC Jack (+5.5 V) 

→ IC302 → Q302 → IC501

DC Jack (+5.5 V) 

→ IC302 → Q301 → IC501

• EEPROM (IC611): 

DC Jack (+5.5 V) 

→ IC302 → IC501→ IC611

• FLASH MEMORY (IC601) (for KX-TG8561 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 → IC501 → IC502 

<Fig.101>

AC Adaptor 

* for KX-TG8561 only

DCP

IC302

Q302

IC501 

IC502

IC601*

IC611

+5.5 V 

1.8 V 

3.0 V 

3.0 V 

Q301

2.4 V 

CHARGE+

D362

R372

R371

DC

Jack

2.85 V 

DCM

1

2

3

On

DC

S

1.8 V

Reset

(IC501(RSTN))

Off