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6

• Design and specifications are subject to change without notice.

• Operation range: Up to 300 m outdoors, Up to 50 m indoors, depending on the condition.
• Analog telephone connection: Telephone Line

7

Analog

Front

End

To TEL_LINE

Bridge

Rect

 D3

 D3

Hook Switch

Q4,Q5

Q4,Q5

Audio

Bell/Caller ID

Interface

CPU

18

16

23

20

21

19

24

BELL

HOOK

Off-Hook Line Voltage

25

A/D

D/A

ADPCM

Codec Filter

DSP

Speech Encoding

Speech Decoding

BMC

Burst Encoding

Burst Decoding

RF

PLL

5

3

77

75

9

10

EEPROM

SCL

SDA

57

58

44

Charge

Detector

(Optional)

BBIC

KX-TG6511/6512 BLOCK DIA

GRAM 

(BASE UNIT)

MOD/DEMOD

Charge

Pump

43

2.5V

XTAL

X1X1

10.368

MHz

RX

n

RX

p

TX

p

TX

n

P

on

PSEL

V

DD

-PADRV

4

3

6

7

TX

on

RX

on

D801

6

72

ANT1

ANT2

9

8

ANT1

ANT2

RF PA

ANT1

ANT2

78

73

74

80

L1

L2

2

To AC Adaptor

Limit

Resistor

CHARGE

CONTACT

IC2

Q9

Q8

2.4V

Reg.

1.8V

Reg.

3.0 V

2.4 V

1.8 V

DCP

DCM

IC3

8

Base Unit consists of the following ICs as shown in Block Diagram (Base Unit) (P.7).

• DECT BBIC (Base Band IC): IC7

- 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: RF Power Amp, EEPROM, LED, Analog Front End, etc.)

• RF Power Amp.: IC801

- Amplifier for transmission and reception

• EEPROM: IC401

- Temporary operating parameters (for RF, etc.)

• 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

9

The power is supplied to the DECT BBIC, RF Module, EEPROM and Charge Contact from AC Adaptor (+6.5 V) as shown in
Fig.101. The power supply is as follows;

• DECT BBIC (IC7): 

DC Jack (+6.5 V) 

→ IC2 → IC7

DC Jack (+6.5 V) 

→ IC2 → Q9 → IC7

DC Jack (+6.5 V) 

→ IC2 → Q8 → IC7

• RF Power Amp. (IC801): 

DC Jack (+6.5 V) 

→ IC2 → IC801 (Power AMP)

• EEPROM (IC401): 

DC Jack (+6.5 V) 

→ IC2 → IC7→ IC401

• Charge Contact (TP16): 

DC Jack (+6.5 V) 

→ R56 →  R55 → D22→ TP16

<Fig.101>