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IC BLOCK DIAGRAM & DESCRIPTION
IC231 LA1844ML (Tuner System)
24
ALC
BUFF
LEVEL
DET
FM
IF
1
IC241 LC72121M-D (Pll Synthesizer)
Vssx
2
REFERENCE
XIN
1
DIVIDER
XOUT
24
SWALLOW COUNTER
FMIN
17
1/2
1/16, 1/17 4bits
12bits PROGRAMMABLE
AMIN
16
DIVIDER
CE
3
DI
4
CCB
DATA SHIFT REGISTER LATCH
I / F
CL
5
DO
6
POWER
V
18
ON
DD
RESET
Vssd
15
8
9
7
BO1 BO2 BO3 BO4
IC460 AN7348K ( Play/Rec Pre Amp)
23
22
21
20
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
PHASE DETECTOR
CHARGE PUMP
UNLOCK
DETECTOR
UNIVERSAL
COUNTER
10
11
14
IO1 IO2
24
23
22
21
A/Rec
Mute
B
PB Amp(L)
PB Amp(R)
A/Rec
Mute
B
2
4
1
3
19
18
17
16
DECODER
ANTI-BIRDIE
P-DET
STEREO
VCO
304kHz
38k
VCC
6
7
8
9
IC450 LC75342M (2 band equalizer)
LSELO LIN LTRE
10
19
PD
L4
11
20
AIN
L3
12
21
AOUT
L2
13
22
Vssa
L1
14
NC
15
NC
16
R1
17
13
IFIN
R2
18
R3
19
R4
20
21
RSELO RIN RTRE
20
19
18
17
16
P
ALC
R
Rec
Amp(L)
Rec
Amp(R)
R
Logic
A/B
Logic
Rec/PB
5
6
7
8
9
- 11 -
15
14
13
PILOT
CANCEL
SW
FF
FF
FF
PILOT
19k
19k
DET
2
10
11
12
LBASS1 LBASS2
9
8
7
6
LVref
CONTROL
CIRCUIT
LOGIC
CCB
CIRCUIT
INTERFACE
CONTROL
CIRCUIT
RVref
22
23
24
25
RBASS1 RBASS2
15
14
13
R
P
Nor/Cro
& Hi/Lo
Logic
Ripple
P
Rejection
10
11
12
LOUT
5
4
TEST
3
V
SS
2
CE
1
DI
30
CL
29
V
DD
28
Vref
27
NC
26
ROUT
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