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To TEL_LINE CN3 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
TXDA RXDA RSSI SYCL SYDA SYEN
ANT1 ANT2 18 16 31
HOOK Bell/Caller ID Interface
Analog Switch IC11
Analog Front End 61 52 60 56 55
ADPCM Codec Filter DSP
RF Interface
2 8 14 21 13 12 IC2 RF Module
BMC
To AC Adaptor
Limit Resistor
CHARGE CONTACT VUNREG
BELL SCL EEPROM IC3 SDA RESET CS FLASH MEMORY (TAM)
IC4
6 5 23 36 38 39 40
CPU BBIC IC8
12
XTAL X1 10.368 MHz
CN1
3.3V IC1 Reg. 3.3V 2.5V Q2 Reg. 2.5V 1.8V Reg. Q3 1.8V
11
SCK SI SO
KX-TCD290 BLOCK DIAGRAM (BASE UNIT)