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5

There are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper
(Sn+Ag+Cu), you can also use Tin and Copper (Sn+Cu), or Tin, Zinc, and Bismuth (Sn+Zn+Bi). Please check the manufac-
turer’s specific instructions for the melting points of their products and any precautions for using their product with other materi-
als. 
The following lead free (PbF) solder wire sizes are recommended for service of this product: 0.3 mm, 0.6 mm and 1.0 mm.

The location of the “PbF” mark is subject to change without notice.

PbF

11

0

16

17

11

32

27

26

KX-TG8120/TG8100/TGA810

PQUP11411Z

1

80

20

21

40

61

41

60

1

4

8

5

6

7

Analog

Front

End

To TEL_LINE

A

B

CN1

Bridge

Rect D3

D3

Hook Switch

Q4,Q5

Audio

Bell/Caller ID

Interface

Analog
Switch

CPU

59
54

61

52
60
56

55

BELL

HOOK

Off-Hook Line Voltage

64 ADCO

D/A

A/D

ADPCM

Codec Filter

DSP

Speech Decoding

Speech Encoding

BMC

Burst Decoding

Burst Encoding

RF

Interface

18

19

TXDA

RXDA

15

21

20

22

RSSI
SYCL
SYDA
SYEN

ANT1
ANT2

RF Module

18

16

2

31

8

21

14

13
12

12

13

XTAL

X1

10.368
MHz

EEPROM

SCL

SDA

6

5

To AC Adaptor

CN2

Limit

Resistor

CHARGE
CONTACT

VUNREG

3.3V
Reg.

IC1

2.5V
Reg.

Q9

1.8V
Reg. Q8

3.3V

2.5V

1.8V

BBIC

KX-TG8105/8106 BLOCK DIAGRAM (BASE UNIT)

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.)

• Additionally,

- Power Supply Circuit (+3.3V, +2.5V, +1.8V output)
- Crystal Circuit (10.368MHz)
- Charge Circuit
- Telephone Line Interface Circuit

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

• DECT BBIC (IC7): 

CN2 (+6.5V) 

→ IC1 → Q9 → IC7

CN2 (+6.5V) 

→ IC1 → Q8 → IC7

• RF Module (IC10): 

CN2 (+6.5V) 

→ IC1 → Q9 → IC10 (PLL)

CN2 (+6.5V) 

→ IC1 → Q10 → IC10 (Power AMP)

• EEPROM (IC5): 

CN2 (+6.5V) 

→ IC1 → Q9 → IC5

• Charge Contact (TP16): 

CN2 (+6.5V) 

→ R55, R56 → TP16

<Fig.101>