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To TEL_LINE CN1 A B Bridge Rect D3

Off-Hook Line Voltage Hook Switch Q4,Q5 Audio

64 ADCO 59 54

D/A A/D

Speech Decoding Speech Encoding

Burst Decoding Burst Encoding

18 19 15 20 21 22

RXDA TXDA RSSI SYCL SYDA SYEN

ANT1 ANT2 4 10 31

Analog Switch HOOK Bell/Caller ID Interface 61 52 60 56 55 Limit Resistor CHARGE CONTACT VUNREG CN1 3.3V IC1 Reg. 3.3V 2.5V Q2 Reg. 2.5V 1.8V Reg. Q3 1.8V FLASH MEMORY (TAM)
IC5

Analog Front End

ADPCM Codec Filter DSP

RF Interface

2 8 14 21 13 12 IC2 RF Module

BMC

BELL SCL EEPROM IC3 SDA RESET CS SCK SI SO 6 5 23 36 38 39 40 BBIC IC8 13 CPU 12

XTAL X1 10.368 MHz

To AC Adaptor

KX-TCD220 BLOCK DIAGRAM (BASE UNIT)