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6-25. IC BLOCK DIAGRAMS
IC1 LA1833N
OSC
AM
AM
AM
AM
FM
OUT
OSC IN
AFC
RF IN
AGC
DET OUT
DET OUT
24
23
22
21
20
19
18
ALC
AM
AM
AM
OSC
MIX
RF. AMP
BUFF
AGC
AM
AM
IF
DET
AM/FM
LEVEL
COMP
IF
DET
BUFF
S-CURVE
FM
TUNING
IF
DRIVE
FM
DET
REG
GND
1
2
3
4
5
6
FM
AM
REG
AM
GND
TU
ST LED
IF IN
MIX OUT
IF IN
LED
IC2 LC72137-D
NC
1
CE
2
DI
CCB
CL
4
I/F
DO
5
REFERENCE
DIVIDER
B01
6
PHASE
12BITS
DETECTOR
PROGRAMMABLE
B02
7
CHARGE
DIVIDER
PUMP
B03
8
UNLOCK
I01
9
DETECTOR
POWER ON
I02
10
RESET
SWALLOW
COUNTER
1/2
1/16,1/17
4BITS
UNIVERSAL
COUNTER
IFIN
11
PLL
MPX
PILOT
R
L
IN
IN
DEL
OUT
OUT
17
16
15
14
13
DECODER
PILOT
ANTI-BIRDIE
CANCEL
P-DET
STEREO
Ø
SW
π
VCO
FF
FF
FF
PILOT
304kHz
38k
19k/2
19k/0
DET
VCC
7
8
9
10
11
12
FM DET
VCC
IF OUT
BAND
ST
S/W
S/W
22 NC
21
XOUT
20
XIN
19
AOUT
18
AIN
PD
17
VSS
16
15
VDD
B04
14
FMIN
13
12
AMIN
– 67 –
IC701 CXA2568M
APC PD AMP
+
–
VCC
VEE
+
–
HOLD
1
VEE
+
+
AGCVTH
2
VREF
–
–
APC LD AMP
LD
3
VC
VCC
PD
4
+
–
+
–
+
+
–
–
A
5
+
–
B
6
VEE
RF SUMMING AMP
RF EQ AMP
VC
+
VC
+
C
7
–
–
D
8
VC
ERROR AMP
FOCUS
VEE
9
VEE
+
–
VC
VC
+
–
F
10
E
11
+
–
–
+
VC
TRACKING
ERROR AMP
VC
VC
VC BUFFER
+
VCC
VC
12
–
VEE
VC
IC703 BA5974FP
28
27
26
25
24
23
22
R
VCC
F
R
MUTE
+ –
INTERFACE
F
VREF
F
F
INTERFACE
R
INTERFACE
F
R
R
1
2
3
4
5
6
7
– 68 –
VCC
24
VCC
23
LC/PD
22
LD ON
21
HOLD SW
20
AGCCONT
(50%/30%
OFF)
19
RF BOT
VC
18
RFTC
17
RF 1
16
RF 0
15
RFE
14
FE
13
TE
21
20
19
18
17
16
15
VCC
LEVEL SHIFT
VCC
VCC
8
9
10
11
12
13
14
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