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  Datasheet File OCR Text:
 LA1837M
LA1837M
LA1837M


LA1837M
15.2
30
16
10.5
7.9
1
1.0 (0.6) 0.4
15
2.35max
0.15
SANYO MFP30S(375mil)
0.1 (2.15)
0.65
LA1837M
AM AGC
OSC
OSC BUFF
VT
FM SD BAND-W + + + + + L.P.F
FM SD ADJ
RF
AM-STEREO L / R-INPUT L R L-OUT R-OUT L.P.F + + 18 17 16
30
29
28 REG
27
26
25
24
23
22
21
20
19
ALC BUFF
AM OSC
AM AM MIX RF. AMP
35 DECODER ANTI-BIRDIE P-DET STEREO SW MUTE
AGC AM IF SD COMP AM S-METER DET VCO 304kHz FF 38k FF 19k 2 FF 19k PILOT DET
FM AM / FM S-METER S-CURVE IF-BUFF FM IF FM DET GND 1 2 FM IFT FM IN (10.7MHz) + 3 4 5 6 7 TUNING DRIVE STEREO DRIVE
VCC 8 + 9 10 11 12 + 13 14 15 FM ST
AM NARROW SD
FM VSM AM VSM (SD-ADJ)
TU-LED
ST-LED
AM / FM IF-BUFF
AM-IF
MUTE
+ + AM MONO VCC Top view
50
AM-IN (1MHz) 39pF 20pF OSC BUFF (1.45MHz) 1000pF
0.047F REG
AFC 0.047F 39mH 10k 22F 18k 0.01F 0.033F 0.033F 10F + L.P.F L.P.F 3.3k 10F + + 3.3k 10F 17 L-OUT R-OUT
5.1k
0.047F
+ 28
3.3F
33F
+ 26
+ 25 24
30
29
27
910pF 23
T1
OSC
22
21
20
19
18
16
LA1837M
1 FM IN (10.7MHz) 0.047F 75 300 T2 2 450kHz 68k 0.047F 47F + 3 4 5 6 SD 1000pF 7 ST 68k 0.047F 8 9 10 4.7k 51 11 12 FM AM VSM V SM 0.047F 5k 1F 13 NORMAL 10k + SEEK1000pF 14 15 FM 0.47F AM STEREO 1F VCC 9.0V Top view
100
5k MONO
+ 100F
0.047F
3k IF-BUFF
AM-ST
VDD
1F
T3
+
+
5k
( )
+
LA1837M
3 2
4
3 2
S4
1 6 1S YD-1073 6 SFU450B
3
4
2
S
1
6
1
3 2
4
6
7
9
LA1837M
10
11
12 28
13
14

15

18 19 16 17

20 21
22
23
LA1837M
24
25
26
27
28
29
30
LA1837M
12
30
26
28

LA1837M
R 24 22 C
R 24 0.01F 22



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