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BU1924F
100 K W
4
MUX
3
VREF
5
VDD1
Analog
VSS1
6
12
VDD2
Digital
11
VSS2
13
14
XI
XO
LA1837
FM SD
OSC
REG
30
29
28
REG
AM
ALC
AM
MIX
RF. AMP
OSC
BUFF
AM IF
SD
COMP
AM/FM
FM
S-CURVE
S-METER
IF-BUFF
FM
AM IF
DET
1
2
3
FM IF/I
AM/O
FM IF/F
-
8TH Switched
Capacitor Filter
+
Anti-Aliasing
Filter
PLL
PLL
57kHz
1187.5Hz
RDS/ARI
Clock
15
NC
AM RF/I
AFC
AM AGC
AM DET/O
27
26
25
24
AM
AGC
DET
AM
S-METER
TUNING
STEREO
DRIVE
DRIVE
GND
4
5
6
7
AM IF/I
GND
TU/ST
AM IF/O
VSS3
CMP
7
8
Comparator
Deffere
Biphase
Ntial
Decoder
Decoder
Test
9
10
T2
T1
FM DEM/O
MPX/I
L/O
R/O
23
22
21
20
3 rd 5 th
DECODER
ANTI-BIRDIE
P-DET
STEREO
Æ
SW
VCO
FF
304kHz
38k
Vcc
8
9
10
11
Vcc
FM DET.
AM/CF
FM S/O
41
16
RCLR
1
QUAL
2
RDATA
R/O
L/I
L/O
R/I
19
18
17
16
MUTE
FF
FF
PILOT
p
19k Ð
19k Ð8
DET
2
12
13
14
15
AM/SD
IF/O
FM/AM SW.
MO/ST
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