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PDF LA1835 Data sheet ( Hoja de datos )
| Número de pieza | LA1835 | |
| Descripción | Home Stereo Single-Chip Tuner IC | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : EN4159B
Monolithic Linear IC
LA1835
Home Stereo Single-Chip Tuner IC
with Electronic Tuning Support
Overview
The LA1835 is an AM, FM IF and MPX single-chip tuner
IC that supports electronic tuning. It was developed
specifically for use in home stereo products and is optimal
for products with auto-seek systems, since it combines SD
and IF counting in its auto-seek implementation.
Furthermore, since the FM detector and MPX VCO
circuits are adjustment free, adoption of the LA1835 can
reduce the number of adjustment steps in the production
line.
Functions
• AM: RF amplifier, mixer, oscillator (with ALC), IF
amplifier, detector, AGC, oscillator buffer,
tuning indicator (narrow-band SD), IF buffer
output, stereo IF output
• FM IF: IF amplifier, quadrature detector, band muting,
tuning indicator, IF buffer output, S-meter
• MPX: PLL stereo decoder, stereo indicator, forced
mono, VCO stop function, adjacent channel
interference rejection function (114 kHz), post-
amplifier with muting function
Features
• Significant reduction in the number of manufacturing
adjustment steps
FM detector: Adjustment free (using a ceramic
discriminator)
MPX VCO: Adjustment free (using a ceramic
resonator)
• Tuning indicator output provided. (This pin can also be
used as a narrow band stop signal and as a muting drive
output.)
• Adjustable FM stop sensitivity and bandwidth
• Built-in AM local oscillator buffer
• Support for AM low band cut control
• Adjustable AM stop sensitivity
Package Dimensions
unit: mm
3196-DIP30SD
[LA1835]
SANYO: DIP30SD
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 Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
11795TH (OT) No. 4159-1/14
1 page  
Pin Functions
No. Function
Voltage
LA1835
Internal equivalent circuit
Note
1 FM IF input
Vreg
Input impedance: ri = 330 Ω
2 AM mixer output
VCC
Recommended AM IFT coil:
PCFAZ-037 (Toko Co., Ltd.)
3 FM IF input bypass
Vreg
Also used for the AF noise filter.
4 REG
Vreg
Vreg = 3.6 V
5 AM IF input
Vreg
6 GND
0
7 Tu-LED
VCC
8 ST-LED
VCC
Also functions as the
AM IF output.
9 FM detector
2.1 (FM)
2.7 (AM)
Input impedance: ri = 2 kΩ
Active low open collector outputs
Pin 8 is used for the AM stereo IF output.
Recommended ceramic discriminator:
CDA 10.7MG-48 (Murata Mfg. Co., Ltd.)
Continued on next page.
No. 4159-5/14
5 Page 
LA1835
No. 4159-11/14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LA1835.PDF ] | |
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