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LA1837 Folha de dados(PDF) 5 Page - Sanyo Semicon Device

Nome de Peças LA1837
Descrição Electrónicos  Single-Chip Home Stereo IC with Electronic Tuning Support
Download  9 Pages
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Fabricante Electrônico  SANYO [Sanyo Semicon Device]
Página de início  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LA1837 Folha de dados(HTML) 5 Page - Sanyo Semicon Device

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Pin No.
Pin Function
Pin voltage (V)
Pin description
Equivalent circuit
No. 5688-5/9
LA1837
AM narrow band CF
connection
1.3 V
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 0.047-
µF capacitor connected in series.
10
FM S-meter output
0 V
RL = 8 kΩ
11
AM S-meter output
AM SD sensitivity
adjustment
0 V (AM)
The AM SD sensitivity is adjusted with the
value of the external resistor connected
between this pin and ground.
12
AM and FM IF buffer
output, output control
switch (mute switch)
0 V
V13
≤ 0.5 V: Reception state
1.4 V
≤ V13 ≤ 2.2 V: IF buffer output turned
on
V13
≥ 3.5 V: IF buffer output and muting are
turned on
13
Phase comparator
low-pass filter
(FM/AM switching)
VCC – 1.4 (FM)
0 V (AM)
Connecting this pin to ground through a
resistor sets the IC to AM mode.
Resistor value limits:
2.7 k
Ω (when VCC = 7 V)
3.9 k
Ω (8 V) 5.1 kΩ (9 V)
6.2 k
Ω(10V)7.5kΩ(11V)
14
Pilot detector low-pass
filter (forced mono)
(VCO stop)
VCC – 1.0
If a current of 50 µA or greater flows from
this pin, the system is forced to mono.
Connecting this pin to ground stops the
VCO.
The resistor limit values are the same as for
pin 14.
15
Post amplifier input and
output
Vreg
Vreg
Output impedance ro = 200 Ω
Pin 16: right output, pin 17: left output
Inverting inputs
Pin 18: right input, pin 19: left input
RNF = 33 kΩ
16
17
18
19
MPX output
3.5 V
3.5 V
Output impedance ro = 3.3 kΩ
Pin 20: right de-emphasis
Pin 21: left de-emphasis
20
21
Continued on next page.
Continued from preceding page.


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