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5

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

• 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: QSPI FLASH MEMORY, EEPROM, LED, Analog Front End, etc.)
- DCDC Converter
- Integrated 1.9GHz PA for DECT

• EEPROM: IC401

- Temporary operating parameters (for RF, etc.)

• Additionally,

- Power Supply Circuit (+3.0 V, +1.8 V output)
- Crystal Circuit (10.368 MHz)
- Charge Circuit
- Telephone Line Interface Circuit

• QSPI FLASH MEMORY IC431

- Main Program D/L Area

6

The power is supplied to the DECT BBIC, QSPI 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 (IC7): 

DC Jack (+5.5 V) 

 IC2  IC7

DC Jack (+5.5 V) 

 IC2  Q8  IC7

• EEPROM (IC401): 

DC Jack (+5.5 V) 

 IC2  IC7 IC401

• Charge Contact (TP16): 

DC Jack (+5.5 V) 

 R56  R55  D22 TP16

• QSPI FLASH MEMORY: 

DC Jack (+5.5 V) 

 IC2  IC7  IC431

<Fig.101>

• Bell signal detection
• Clip signal detection
• ON/OFF hook circuit

In the standby mode, Q3 is open to cut the DC loop current and decrease the ring load.
When ring voltage appears at the L1T (A) and L1R (B) leads (when the telephone rings), the AC ring voltage is transferred as
follows;

• B 

 P1  C4  R6  R33  IC7 Pin 15 (CID INp) 

• A 

 C3  R4  R35  IC7 Pin 17 (CID INn)

In the standby mode, Q3 is open, and connected as to cut the DC loop current and to cut the voice signal. The unit is
consequently in an on-hook condition. 
When IC7 detects a ring signal or press the TALK Key onto the handset, Q4 turns on and then Q3 turns on, thus providing an
off-hook condition (DC current flows through the circuit) and the following signal flow makes the loop current.

• B 

 P1 D3  Q3  Q5  R21  R22  D3  A [OFF HOOK]

AC Adaptor 

DCP

IC2

IC7 

IC401

IC431

5.5 V 

1.8 V 

3.0 V 

3.0 V 

Q8

TP16

D22

R55

R56

DC

Jack

2.85 V 

DCM

1

2

3

On

DC 

S

1.8 V

Reset

(IC7_61pin)

Off

7

QSPI

FLASH MEMORY

IC4

SPEAKER

RECEIVER

MIC

CHARGE

Power Failer Mode

Power Supply SW

Q10, R11, Q12,

Q11, R14, R13, R6

CIRCUIT

Q4, Q5, Q6,Q

4

, 

Q

5

, 

Q

6

,

Q9, R4Q

9

, 

R

4

CHARGE

CONTACTS

CHARGE(+)

CHARGE_CTRL

BATTERY_ON

CHARGE

EEPROM

SCL

SDA

BATTERY

TERMINAL

R45

VBAT

BATT-

1.8 V

Q2Q

2

1.8 V

CP 2.8 V

LCD

CD

RESET

CSB

SDA

 SCL

CPU

Analog

Front

End

D/A

A/D

35

37

21

22

17

18

34

33

66

67

 38

24

44

45

73

63

64

76

ADPCM

Codec

Filter

DSP

Speech

Decoding

Speech

Encoding

BMC

Burst

Decoding

ANT1

Burst

Encoding

RF 

PLL

MOD/DEMOD

3

1

2

87

86

RXn

RXon

ANT1

DA801

RXp

TXp

TXn

TXon

7

8

XTAL

X1

10.368

MHz

BATTERY

46

ON SWITCH

KEYPAD

Charge

Pump

ROWS

COLUMNS

CP3.0V

D3

CP2.8V

CPV2

57, 58, 59, 60

25, 11, 12, 13, 14, 55

53, 48, 47, 51 QSPI-IO 0-3

BBIC

 65

LCD-BACK  LIGHT

KEY   LED

BELL  LED

61

80

88

LDO_CTRL

KX-TGA661 BLOCK DIA

GRAM (HANDSET)

CP 3.0 V

CP 2.8 V

QSPI

Control

 52 QSPI-SCK

 49 QSPI-CS

TGA661 only

79

8

When power on the Handset, the voltage is as follows;
BATTERY(2.2 V ~ 2.6 V: BATT+) 

 F1  Q2 (1.8 V), IC1-44pin (3.0V)

The Reset signal generates IC1 (71 pin) and 1.8 V.

1.8 V

Reset
(IC1_71pin)

Battery +