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SPP-904
• IC Block Diagrams
IC1 LA8633VU-TLM (BASE MAIN Board)
IC403 LA8633VU-TLM (HAND MAIN Board)
24
23
22
21
20
19
18
VB
SUM AMP
VB
MUTE
IDC
VB
PREAMP
VCA
SUM AMP
VB
VCA
DATA
DRIVE
SHAPE
1
2
3
4
5
6
7
8
9
IC3 MC3361CDR2 (BASE MAIN Board)
IC401 MC3361CDR2 (HAND MAIN Board)
MIXER
SCAN
SQUELCH
FILTER
FILTER
RECOVERED
INPUT
GND
MUTE
CONTROL
IN
OUTPUT
INPUT
AUDIO
15
16
14
13
12
11
10
_
AF
FILTER
+
AMP
AMP
SQUELCH TRIGGER WITH
+
HYSTERESIS
DEMODULATOR
LIMITER
+
AMP
MIXER
OSCILLATOR
1
2
3
4
5
6
7
8
QUAD
MIXER
VCC
LIMITER
COIL
OUTPUT
INPUT
CRYSTAL
DECOUPLING
OSC
17 16
15 14
13
REGULATOR
10 11
12
9
IC302 M64884FP-C60J (BASE RF Board)
IC502 M64884FP-C60J (HAND RF Board)
24
23
22
21
20
19
18
VCO (RX)
MIX
PHASE
DETECTOR
LATCH
1/32, 1/33
PROGRAMMABLE
PRESCALER
DEVIDER
LATCH
PROGRAMMABLE
DEVIDER
LATCH
1/16, 1/17
PROGRAMMABLE
1/2
PRESCALER
DEVIDER
PHASE
VCO (TX)
DETECTOR
1
2
3
4
5
6
7
8
IC405 TK11130SCL (HAND MAIN Board)
5
4
REGULATOR
THERMAL
SENSOR
VOLTAGE
COMP.
COMP.
CONTROL
BANDGAP
REFERENCE
1
2
3
28
28
17
16 15
14
13
LOCK
DETECTOR
PULSE
COUNTER
LATCH
SELECT
SHIFT
REGISTOR
OSC &
1/2 DEVIDER
9
10
11
12
IC406 XC612N3328MR (HAND MAIN Board)
5
4
COMP.
REFERENCE
VOLTAGE
COMP.
1
2
3
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