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IC BLOCK DIAGRAM & DESCRIPTION
IC231 LA1844ML (Audio Tuner)
24
ALC
BUFF
LEVEL
DET
FM
IF
1
IC400,421,423 KIA4558F(Operation Amp.)
OUT A
1
A
-IN A
2
-
+
+IN A
3
V
4
EE
IC241 LC7212M-D(PLL)
Vssx
2
XIN
1
XOUT
24
FMIN
17
AMIN
16
CE
3
DI
4
CL
5
DO
6
V
18
DD
Vssd
15
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23
22
21
20
19
AM
AM
AM
MIX
RF.AMP
OSC
AGC
AM
AM
DET
IF
AM/FM
IF
COMP
S-CURVE
BUFF
TUNING
DRIVE
FM
DET
REG
GND
2
3
4
5
6
V
8
CC
OUT B
7
B
-IN B
6
+ -
+IN B
5
REFERENCE
DIVIDER
SWALLOW COUNTER
1/2
1/16, 1/17 4bits
12bits PROGRAMMABLE
DIVIDER
CCB
DATA SHIFT REGISTER LATCH
I / F
POWER
ON
RESET
7
8
9
10
BO1 BO2 BO3 BO4
18
17
16
15
14
PILOT
DECODER
CANCEL
ANTI-BIRDIE
P-DET
STEREO
SW
VCO
FF
FF
FF
304kHz
38k
19k
19k
2
VCC
7
8
9
10
11
IC420,424 NJM2058(Operation Amp.)
A OUTPUT
1
2
A INPUT
3
A +INPUT
4
V+
B+INPUT
5
6
B INPUT
7
B OUTPUT
PHASE DETECTOR
CHARGE PUMP
UNLOCK
DETECTOR
UNIVERSAL
COUNTER
11
14
IO1 IO2
- 33 -
13
PILOT
DET
12
14
D OUTPUT
A
D
13
D INPUT
12
D+INPUT
V
11
10
C+INPUT
9
C INPUT
C
B
8
C OUTPUT
19
PD
20
AIN
21
AOUT
22
Vssa
13
IFIN
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