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LA1837 Datenblatt(PDF) 4 Page - Sanyo Semicon Device

Teilenummer LA1837
Bauteilbeschribung  For Home Stereo IC with Electronic Tuning Support Single-Chip IC
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Hersteller  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LA1837 Datenblatt(HTML) 4 Page - Sanyo Semicon Device

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LA1837
Test Circuit
LA1837
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
OSC
BUFF
(1.45MHz)
T1
REG
AFC
+
AM-IN
(1MHz)
0.047
μF
39mH
10k
Ω
0.047
μF
+
+
0.01
μF
10
μF
18k
Ω
+
L.P.F
+
FM
+
L.P.F
L-OUT R-OUT
+
STEREO
+
+
0.047
μF
100
μF
VCC
9.0V
VDD
+
AM
VSM
FM
VSM
T3
+
ST
AM-ST
SD
T2
450kHz
+
FM IN
(10.7MHz)
300
Ω
Top view
Pin Functions
Pin No.
Pin function
Pin voltage (V)
Pin description
Equivalent circuit
1
FM IF input
Vreg
Input impedance ri = 330Ω
1
3
2
AM mixer output
VCC
Connect the mixer coil between this pin and VCC.
2
3
FM IF input bypass
Vreg
Also functions as the MPX regulator filter.
See pin 1.
4
AM IF input
Vreg
Input impedance ri = 2kΩ
4
5
GND
0V
6
7
TU-LED
ST-LED
AM-IF output
VCC
VCC
Active low
Open collector output
AM stereo IF output (pin 7)
The current input must not exceed 150
μA.
6
7
8
VCC
VCC
9
FM detector
VCC
Recommended detector coil : 600BEAS-9715Z
(The Toko Electric Corporation)
9
10
AM narrow band CF
connection
1.3V
Recommended narrow band CF: BFU450 C4N
(Murata Mfg. Co., Ltd.)
If the narrow band SD is not used, bypass this circuit
with a 50
Ω resistor and a 0.047μF capacitor
connected in series.
10
Continued on next page.
No.5688-4/9


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