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PDF LA1838 Data sheet ( Hoja de datos )
| Número de pieza | LA1838 | |
| Descripción | Single-Chip Home Stereo IC with Electronic Tuning Support | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : EN5888
Monolithic linear IC
LA1838
Single-Chip Home Stereo IC with Electronic
Tuning Support
Overview
The LA1838 is designed for use in home stereo systems
and is a single-chip tuner IC that provides electronic
tuning functions for AM, FM IF, and MPX reception. It is
optimal for use in products that adopt an automatic tuning
system based on an IF count.
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
(signal detection), S-curve detection, IF buffer
output
• MPX: PLL stereo decoder, stereo display, forced
monaural, VCO stop, post amplifier, audio
muting, adjacent channel interference rejection
function
Pd max - Ta
600
550
500
Features
• Integrated MPX VCO (External components are no
longer required.)
• Built-in adjacent channel interference rejection function
(third and fifth order)
• Adjustment-free FM detector circuit (Uses a ceramic
discriminator.)
• The AM and FM SD sensitivities can be set
independently.
• The AM and FM output levels can be set independently.
• Improved useable AM sensitivity and strong field
distortion characteristics.
Package Dimensions
unit: mm
3061-DIP30S
[LA1838]
30 16
400 1 15
27.2
300
200
100
0
-40 -20
0
20 40 60 80 100
Ambient temperature, Ta —°C
1.15 1.78
0.48 0.95
SANYO: DIP30S
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
40999RM (OT) No. 5888-1/9
1 page  
Continued from preceding page.
Pin No.
Pin function
Pin voltage
10
AM narrow band
CF connection
1.3 V
LA1838
Notes
Recommended narrow band CF: BFU450 C4N
(Murata Mfg. Co., Ltd.)
When the narrow band SD function is not used,
bypass this circuit with a 50 Ω resistor and a
0.047 µF capacitor in series.
Equivalent circuit
10
A10640
11 FM S-meter output 0 V
RL = 8 kΩ
11
A10641
12
AM S-meter
output
0 V (AM)
The AM SD sensitivity is adjusted with an external
resistor connected between this pin and ground
28
AM/FM IF buffer
output,
13 Output control
switch
(mute switch)
0V
V13 ≤ 0.5 V: Reception state
1.4 V ≤ V13 ≤ 2.2 V: IF buffer output on
V13 ≥ 3.5 V: IF buffer output and muting on
The device operates in AM mode when this pin is
connected to ground through a resistor.
14
Phase comparator
low-pass filter
(AM/FM switching)
VCC – 1.4 (FM)
0 V (AM)
Limit values for the resistor:
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-
15 pass filter (Forced VCC – 1.0
mono) (VCO stop)
The device is forced to monaural when a current of
over 50 µA flows from this pin.
The VCO is stopped if this pin is connected to
ground.
The limit values for the resistor are the same as
those for pin 14.
16
17 Post-amplifier
Vreg
18 inputs and outputs Vreg
19
Output impedance ro = 200 Ω
Pin 16: Right output, pin 17: Left output
Inverting input pins
Pin 18: Right input, pin 19: Left input
RNF = 33 kΩ
18
19
12
A10642
13
A10643
14
A10644
15
A10645
16
17
A10646
20
MPS outputs
21
3.5 V
3.5 V
Output impedance ro = 3.3 kΩ
Pin 20: Right deemphasis
Pin 21: Left deemphasis
20
21
A10647
Continued on next page.
No. 5888-5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LA1838.PDF ] | |
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