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IC, LA1843/LA1844L-A
24
23
ALC
AM
OSC
BUFF
LEVEL
DET
S-CURVE
FM
FM
IF
DET
1
2
IC, BU1920FS
1
MUX
2
Vref
14
VDD
RESET
16
5
VSS
8
XI
22
21
20
AM
AM
MIX
RF. AMP
AGC
AM
AM
DET
IF
AM/FM
COMP
IF
BUFF
TUNING
DRIVE
REG
GND
3
4
5
100kΩ
PLL
57kHz
RDS/ARI
REFERENCE
CLOCK
7
XO
19
18
17
P-DET
Ø
VCO
304kHz
6
7
8
FO
4
8TH SWITCHED
CAPACITOR FILTER
PLL
BI-PHASE
1187.5HZ
DECODER
47
16
15
14
PILOT
DECODER
ANTI-BIRDIE
CANCEL
STEREO
SW
FF
π
FF
FF
38k
19k
19k
2
Vc
9
11
10
CMP
3
13
10
12
DIFFERENTIAL
11
DECODER
9
TEST CIRCUIT
6
15
T1
T2
13
PILOT
DEL
12
ARI
RCLK
QUAR
RDATA
T57
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