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IC BLOCK DIAGRAM & DESCRIPTION
IC231 LA1844ML ( Tuner System)
IC241 LC72121M-D (Pll Synthesizer)
Vssx
2
REFERENCE
XIN
1
DIVIDER
XOUT
24
SWALLOW COUNTER
FMIN
1/2
17
1/16, 1/17 4bits
12bits PROGRAMMABLE
AMIN
16
CE
3
DI
4
CCB
DATA SHIFT REGISTER LATCH
I / F
CL
5
DO
6
POWER
V
18
ON
DD
RESET
Vssd
15
8
7
BO1 BO2 BO3 BO4
IC450 LC75342M
(Electronically Controllable Electronic Volume)
30
29
28
27
26
25
1
2
3
4
5
6
24
23
22
21
ALC
AM
AM
AM
MIX
RF.AMP
OSC
BUFF
AM
LEVEL
AM/FM
DET
IF
S-CURVE
BUFF
FM
FM
IF
DET
REG
1
2
3
4
PHASE DETECTOR
CHARGE PUMP
UNLOCK
DETECTOR
DIVIDER
UNIVERSAL
COUNTER
9
10
11
14
IO1 IO2
24
23
22
21
20
19
18
17
12
7
8
9
10
11
13
14
20
19
18
17
AGC
P-DET
AM
DET
IF
COMP
TUNING
DRIVE
GND
5
6
7
IC251 LC72722 (RDS Signal Processor)
19
PD
Vdda
3
REFERENCE
VOLTAGE
Vssa
4
20
AIN
ANTIALIASING
21
AOUT
2
MPXIN
FILTER
22
Vssa
20
DO
CL
21
C C B
DI
22
CE
23
T1
7
T2
TEST
8
13
IFIN
9~11,16,17
T3~T7
IC451 KIA4558S
(Dual Low Noise Operational Amplifier)
16
1
15
- 18 -
16
15
14
PILOT
DECODER
CANCEL
ANTI-BIRDIE
STEREO
SW
VCO
FF
FF
FF
304kHz
38k
19k
19k
2
VCC
8
9
10
11
VREF
FLOUT CIN
1
5
6
PLL
(57kHz)
VREF
57kHz
BPF
SMOOTHING
(SCF)
FILTER
R A M
ERROR CORRECTION
(24 BLOCK DATA)
(SOFT DECISION)
CLK(4.332MHz)
MEMORY CONTROL
OSC / DIVIDER
13
12
XIN
XOUT
A
2
3
4
5
6
13
PILOT
DET
12
CLOCK
Vddd
14
RECOVERY
(1187.5Hz)
Vssd
15
DATA
19
RDS-ID
DECODER
18
SYNC
SYNC/EC CONTROLLER
24
SYR
SYNC
SYNC
DETECT-1
DETECT-2
B
8
9
7
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