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8

D101

CHARGE_C

ON

T

A

C

T

+

-

X501

13.824 MH

z

AN

T

1

TEL J

A

CK

L1R

L1T

DCP

DCM

DC J

A

CK

SIDE

 T

ONE

CIRCUIT

Q161

Q141

BELL 

DE

TEC

T

HOOK

BELL

Q111

LIN

LOUT

RF_

P

A

R

T

HSMIP

HSMIN

BBIC

RECEIVE

AMP

DCIN 1 and 3

VC

C

P

A

VB

A

T_APU

VB

A

T

VC

C_FE

VC

C_IF

VC

C_VC

O

DCINS

CHARGE_DE

T

3.0V

DOUBOUT

SCL, S

DA

WP

VC

C

LCD_B

LT

SW1

Q171

DI,CS

KEYIN 1

KEYS_C

DC/DC

 

C

ONVER

TER

CLK,DO

STM/CKM

R371

R372

D362

Q701, Q702

CHARGE

DE

TEC

T

VCCA

VC

C

SCL,RST

CS

,CD

,SIO

DCIN 2

CA

P

_

SW

CAP_CHG

T

G2521 only

AN

T

2

AN

T

1

RX

p

RX

n

RX

O

N

TX

p

TX

n

TX

O

N

R

ESET

RS

T

N

IN USE

DE

TEC

T 2

R150, R152

FLASH

MEMOR

Y

VBA

T

EEPROM

MEMOR

Y

HS_SUPPL

Y_DE

T

KX

-T

G2511/2521 BL

OCK DIA

GRAM 

(BASE UNIT

)

RL

Y

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-TG2521 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

[Changed from original section “4.3. Block Diagram (Base Unit RF Part)”]

R X p

R X n

AN T 1

T X p

T X n

KX-TG2511/2521 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 functions as 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

• Bell signal detection
• ON/OFF hook and pulse dial circuit
• Side tone 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 

 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

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

SW1/ Charge

EEPROM IC611