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8

Oper

ational P

.C

. Board

D101

CHARGE_CONT

A

C

T

+

-

SP

X501

13.824 MHz

ANT

2

ANT

1

TEL

 J

A

CK

L1R

L1T

DCP

DCM

DC J

A

CK

RL

Y

LINE

DETECT

SIDE T

O

NE

CIRCUIT

Q161

Q141

BELL

 

DETECT

HOOK

BELL

Q

111

LIN

LOUT

RF_P

AR

T

HSMIP

HSMIN

IC501

BBIC

INUSE

DETECT

 2

RECEIVE

AMP

DCIN 1 and 3

IC302

VCCP

A

VBA

T_APU

VBA

T

VCC_FE

VCC_IF

VCC_VCO

DCINS

CHARGE_DET

3.0V

DOUBOUT

SCL, SDA

WP

VCC

IC601

FLASH

MEMOR

Y

IC61

1

EEPR

OM

MEMOR

Y

KEYS

R151,R152

Q171

DI,CS

MSG_LED

KEYIN 1~3

KEYS_C~E

SPOUTN

SPOUTP

3.0 V

REGULA

T

O

R

Q351,

 Q352

CLK,DO

STM/CKM

R371

R372

D362

Q701, Q702

CHARGE

DETECT

VCCA

VCC

SCL,RST

CS

,CD,SIO

DCIN 2

CAP

_

SW

CAP_CHG

HS_SUPPL

Y_DET

BA

CKUP

CAP

 CIRCUIT

PO

WER

SUPPL

Y

CIRCUIT

FR

OM

HS

C901

optional

optional

TG6721 only

TG6721 only

ANT2

ANT1

RXp

RXn

RXON

TXp

TXn

TXON

RESET

RSTN

KX-TG681

1/6821 BLOCK DI

A

GRAM 

(BASE UNIT)

LED

T

AM counter P

.CBoard

9

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

• EEPROM: IC611

- Temporary operating parameters (for RF, etc.)

• FLASH MEMORY: IC601 (for KX-TG6821 only)

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

• Additionally,

- Power Supply Circuit (+3.0 V output)
- Crystal Circuit (13.824 MHz)
- Charge Circuit

- Telephone Line Interface Circuit

10

DA802

ANT2

ANT1

RXp

RXn

ANT2

ANT1

TXp

TXn

KX-TG6811/6821 BLOCK DIAGRAM (Base Unit_RF Part)

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

*1

Flash Memory  IC601

*1

 Host CPU

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

ADPCM

Keys/ LEDs/ Charge

*1

EEPROM IC611

*1 for KX-TG6821 only

Speaker

*1