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PDF LA1837M Data sheet ( Hoja de datos )
| Número de pieza | LA1837M | |
| Descripción | Single-Chip AM/FM Tuner IC | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Ordering number : EN8271
LA1837M
Monolithic Linear IC
Single-Chip AM/FM Tuner IC
for Home Stereo Systems
http://onsemi.com
Overview
The LA1837M is a single-chip AM/FM tuner IC that provides AM and FM IF and multiplex decoding circuits for
electronic tuning and was developed for use in home stereo systems. It provides both SD and IF counting techniques for
optimal implementation of automatic station selection.
Features
• On-chip MPX VCO circuit (no external components required).
• Adjacent channel interference rejection function (third order and fifth order).
• Supports both the SD and IF counting technique (built-in SD speedup function).
• The AM and FM SD sensitivity can be set independently.
• The AM and FM output levels can be set independently.
• Improved basic FM reception performance.
Functions
• AM: RF amplifier, mixer, oscillator, IF amplifier, detector, AGC, oscillator buffer, S-meter, narrow band SD, IF
buffer
• FM IF: IF amplifier, quadrature detector, S-meter, SD, S curve detection, IF buffer output
• Multiplex stereo decoding: PLL stereo decoder, stereo indicator, forced monaural, VCO stop function, post amplifier,
audio muting, adjacent channel interference rejection function
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Maximum supply voltage
Allowable power dissipation
VCC max
Pd max
Ta≤70°C*
Operating temperature
Topr
Storage temperature
Tstg
*: Mounting board: 114.3×76.1×1.6mm glass epoxy board
Conditions
Ratings
12
550
-20 to +70
-40 to +125
Unit
V
mW
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Semiconductor Components Industries, LLC, 2013
May, 2013
92706 / O3105 MS OT B8-3807 No.8271-1/9
1 page  
Continued from preceding page.
Pin No.
Pin
10 AM narrow band
ceramic filter
connection
Pin
voltage
1.3V
11 FM S-meter
output
0V
LA1837M
Equivalent circuit
Pin function
Recommended narrow band ceramic filter
BFU450C4N (Murata Mfg. Co., Ltd.)
When the narrow band SD function is not used, bypass this circuit
by connecting a 50Ω resistor and a 0.047µF capacitor in series.
RL = 8kΩ
12 AM S-meter 0V (AM)
output,
AM SD
sensitivity
adjustment
13 AM/FM IF buffer 0V
output,
Output control
switch (muting
switch)
14 Phase
comparator
VCC-1.4
(FM)
low-pass filter 0V (AM)
(FM/AM
switching)
15
Pilot detector
VCC-1.0
low-pass filter
(Forced
monaural)
(VCO stop)
16
Post amplifier
Verg
17 I/O
Verg
18
19
20 Multiplex output 3.5V
21 3.5V
22 Multiplex input 2.9V
The AM SD sensitivity can be adjusted with an external resistor
between this pin and ground.
V13 ≤ 0.5V: Reception state
1.4V ≤ V13 ≤ 2.2V: IF buffer output on
V13 ≥ 3.5V: IF buffer output and muting on
The IC switches to AM mode when this pin is connected to ground
through a resistor.
Resistor value limits: 2.7kΩ (when VCC = 7V)
3.9kΩ (8V) 5.1kΩ (9V)
6.2kΩ (10V) 7.5kΩ (11V)
When a current of over 50µA is sourced by this pin, the IC
switches to forced monaural mode.
The VCO is stopped if this pin is connected to ground.
The resistor value limits are the same as for pin 14.
Output impedance ro = 200Ω
Pin 16: right output, pin 17: left output
Inverting input pins
Pin 18: right input, pin 19: left input
RNF = 33kΩ
Output impedance ro = 3.3kΩ
Pin 20: Right channel deemphasis
Pin 21: Left channel deemphasis
Input impedance ri = 20kΩ
23 FM
2.8V (FM)
demodulated
2.8V (AM)
output
Output impedance ro = 3.0kΩ
The separation can be adjusted with an external capacitor
connected between this pin and ground.
The VOsub/VOmain ratio is set to be approximately 0dB.
Continued on next page.
No.8271-5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LA1837M.PDF ] | |
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