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PDF LA1837 Data sheet ( Hoja de datos )
| Número de pieza | LA1837 | |
| Descripción | Single-Chip Home Stereo IC with Electronic Tuning Support | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : EN5688
Monolithic Linear IC
LA1837
Single-Chip Home Stereo IC with
Electronic Tuning Support
Overview
The LA1837 is a single-chip AM/FM IF and MPX IC that
supports electronic tuning and was developed for use in
home stereo systems. It is optimal for use in automatic
station selection systems that use the SD and IF counting
techniques.
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, S-
curve detector, IF buffer output
MPX: PLL stereo decoder, stereo display, forced mono,
VCO stop, post amplifier, audio muting, adjacent
channel interference rejection function
Features
• On-chip MPX VCO (no external components required)
• Adjacent channel interference rejection function
(third and fifth order)
• Supports both the SD and the IF counting techniques.
• The AM and FM SD sensitivities can be set independently.
• The AM and FM output levels can be set independently.
• Improved AM practical sensitivity and high-input
distortion characteristics
Package Dimensions
unit: mm
3061-DIP30S
[LA1837]
SANYO: DIP30S
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
Pd max
Topr
Tstg
Ta ≤ 70°C
Operating Conditions at Ta = 25°C
Parameter
Recommended supply voltage
Operating voltage range
Symbol
VCC
VCC op
Conditions
Conditions
Ratings
12
550
–20 to + 70
–40 to +125
Unit
V
mW
°C
°C
Ratings
9
7 to 11
Unit
V
V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
82097HA(OT) No. 5688-1/9
1 page  
LA1837
Continued from preceding page.
Pin No.
Pin Function
Pin voltage (V)
Pin description
10 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.
11 FM S-meter output
0 V RL = 8 kΩ
AM S-meter output
12 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.
AM and FM IF buffer
13 output, output control
switch (mute switch)
V13 ≤ 0.5 V: Reception state
1.4 V ≤ V13 ≤ 2.2 V: IF buffer output turned
0 V on
V13 ≥ 3.5 V: IF buffer output and muting are
turned on
Phase comparator
14 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 kΩ (when VCC = 7 V)
3.9 kΩ (8 V) 5.1 kΩ (9 V)
6.2 kΩ (10 V) 7.5 kΩ (11 V)
Pilot detector low-pass
15 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.
16
17 Post amplifier input and
18 output
19
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
20
MPX output
21
3.5 V
3.5 V
Output impedance ro = 3.3 kΩ
Pin 20: right de-emphasis
Pin 21: left de-emphasis
Equivalent circuit
Continued on next page.
No. 5688-5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LA1837.PDF ] | |
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