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6

• Specifications are subject to change.

• 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

A

B

CN1

Bridge

Rect

 D3 D3

Hook Switch

Q

4

,Q

5

Audio

Bell/Caller ID

Interface

CPU

59

54

61

52

60

56

55

BELL

HOOK

Off-Hook Line Voltage

64 ADCO

A/D

D/A

ADPCM

Codec Filter

DSP

Speech Encoding

Speech Decoding

BMC

Burst Encoding

Burst Decoding

RF

Interface

18

19

TXDA

RXDA

21

20

22

SYCL

SYDA

SYEN

ANT1

ANT2

RF Module

18

16

2

31

8

21

14

13

12

12

13

XTAL

X

1

10.368

MHz

EEPROM

SCL

SDA

6

5

7

To AC Adaptor

CN2

Limit

Resistor

Charge

Detector

CHARGE

CONTACT

(Optional)

VUNREG

3.3V

Reg.

IC

1

2.5V

Reg.

Q

9

1.8V

Reg.

Q

8

3.3 V

2.5 V

1.8 V

BBIC

FLASH

MEMORY

(TAM)

TAM Companion IC

RESET

CS

CS

3

4

2

1

8

SCK

SI

SO

9

14

16

39

40

38

36

37

62

10

11

23

12

KX-TG8227 BLOCK DIA

GRAM 

(BASE UNIT)

CLK

RST

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
- All interfaces (ex: RF module, EEPROM, LED, Analog Front End, etc.)

• RF Module: IC10

- PLL Oscillator
- Detector
- Compress/Expander
- First Mixer
- Amplifier for transmission and reception

• EEPROM: IC5

- Temporary operating parameters (for RF, etc.)

• FLASH MEMORY: IC11

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

• TAM Companion: IC8

- Voice data compression and decompression
- Speaker Amp
- LED Driver

• Additionally,

- Power Supply Circuit (+3.3 V, +2.5 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, FLASH MEMORY, TAM Companion and Charge Contact from
AC Adaptor (+6.5 V) as shown in Fig.101. The power supply is as follows;

• DECT BBIC (IC7): 

CN2 (+6.5 V) 

→ IC1 → Q9 → IC7

CN2 (+6.5 V) 

→ IC1 → Q8 → IC7

• RF Module (IC10): 

CN2 (+6.5 V) 

→ IC1 → Q8 → IC10 (Radio Transceiver) (Digital)

CN2 (+6.5 V) 

→ IC1 → Q9 → IC10 (Radio Transceiver) (Analog)

CN2 (+6.5 V) 

→ IC1 → R125 → IC10 (Power AMP)

• EEPROM (IC5): 

CN2 (+6.5 V) 

→ IC1 → Q9 → IC5

• FLASH MEMORY (IC11): 

CN2 (+6.5 V) 

→ IC1 → IC11

• TAM Companion (IC8): 

CN2 (+6.5 V) 

→ IC1 → Q9 → IC8

CN2 (+6.5 V) 

→ IC1 → Q8 → IC8

• Charge Contact (TP16): 

CN2 (+6.5 V) 

→ R57 → R56 → R55 → D22 → TP16

<Fig.101>