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8

Analog

Front

End

To TEL_LINE

Bridge

Rect D101

Hook Switch

Q141, Q142, Q161

Audio

Bell/Caller ID

Interface

CPU

MICn

LSRp

RINGn

CIDINp

CIDINn

CIDOUT

RINGOUT

BELL

HOOK

CHARGE_DET

Off-Hook Line Voltage

P

A

RADET

A/D

D/A

ADPCM

Codec Filter

DSP

Speech Encoding

Speech Decoding

BMC

Burst Encoding

Burst Decoding

RF

PLL

XT

AL2

XT

AL1

EEPROM

SCL

SDA

To AC Adaptor

To HANDSET

Limit

Resistor

R371, R372,

D362

Charge

Detector

CHARGE(+)

CHARGE(-)

for KX-PRS120 only

IC302 3.0V IC

3

0

2

 3

.0

V

 

REGULA

T

O

R

R

E

G

U

L

A

T

O

R

Q302Q

3

0

2

Q301Q

3

0

1

2.4V

Reg.

1.8V

Reg.

3.0 V

2.4 V

1.8 V

BBIC

KX-PRS1

10/120 BLOCK DIAGRAM (BASE UNIT)

MOD/DEMOD

Charge

Pump

DCDC

Converter

Reset

CP_VOUT2

XTAL

X501X

5

0

1

10.368

MHz

RX

n

RX

p

TX

p

TX

n

DA802

ANT1

ANT2

ANT1

ANT2

ANT1

ANT2

L1

L2

DCP

DCM

FLASH MEMORY

QSPI

FLASH MEMORY

CP_VOUT1

3.0V

3.0V

RSTN

Pin 62

TAM-CSn

SPI-DI 
SPI-DO

SPICLK

QSPI-CS

QSPI-SCK

QSPI-IO 0-3

Q701, Q702

QSPI

Control

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, Analog Front End, etc.)
- Integrated 1.9GHz PA for DECT

• EEPROM: IC611

- Temporary operating parameters (for RF, etc.)

• FLASH MEMORY: IC601 (for KX-PRS120 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

(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.

• 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
theTelephone line, etc. They are determined by the signal path route operation of voice signal.

• Block Interface Circuit

RF part, Key scan, 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/ Charge

EEPROM IC611

*1

*1

*1

*1 for KX-PRS120 only

11

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-PRS120 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-PRS120 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

3.0 V 

DCM

1

2

3

On

DC

S

1.8 V

Reset

(IC501(RSTN))

Off