Sanyo AVM-2550S Training Manual page 58

TUNER
(CXA3135AN)
UHF/VHF
LOCAL OSC
PRESCALER
MAIN COUNTER SWALLOW
COUNTER
9-bit
PROGRAMMABLE
DIVIDER
14-bit
2
I C BUS
RECEIVER
3
SDA
ADSW
DECODER
FMT
BVL
4 5
BUFFER
LOCAL
BAND SW
1/8
BAND SW
DRIVER
PHASE
COMPARATOR
5-bit
7.8125 KHz
4-bit
REF. DIVIDER
18-bit SHIFT
REGISTER
REF. OSD
2 1
SCL
CPU
Synthesizer Tuning Circuit
– 55 –
CHARGE
PUMP OUT
BVH BU LOCK
6 7 28 26
CHARGE LOCK
PUMP DET.
7.8125 KHz
1/512
4 MHz
29
REF. OSC
4 MHz CRYSTAL