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Sanyo Semicon Device - Support for AM Stereo and Electronic Tuning Single Chip Music Center IC

Numéro de référence LA1831
Description Support for AM Stereo and Electronic Tuning Single Chip Music Center IC
Fabricant Sanyo Semicon Device 
Logo Sanyo Semicon Device 





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LA1831 fiche technique
Ordering number: EN«98A
JSA\YO
No.4298A
Monolithic Linear IC
LA1831,1831M
Support for AM Stereo and Electronic Tuning
Singie Chip Music C e n t e r l C (AM/FM IF + MPX)
for Use in Compact Radio/Casette Products
Overview
The LA1831 is a single chip AM/FM IF and MPX tuner
IC that supports electronic tuning. This chip was
developed for consumer audio systems and is optimal
for auto-seek systems based on IF count methods used
together with SD.
Since no adjustments are required in the FM detector
and MPX VCO circuits, use of this chip can
significantly reduce the number of adjustment steps in
the end-product manufacturing line.
Functions
AM:
FM IF:
MPX:
RF amplifier, mixer, oscillator (with ALC),
IF amplifier, detector AGC, oscillator buffer,
tuning indicator, IF buffer output, stereo
IF output.
IF amplifier, quadrature detector, S curve
detection, tuning indicator, IF buffer output,
S-meter
PLL stereo decoder, stereo indicator, force to
mono, VCO stop
Features
• Major reduction in required adjustments
- FM detector: No adjustments
(ceramic discriminator used)
- MPX VCO: No adjustments
(ceramic resonator used)
• Tuning indicator pin provided (can be used as a
narrow bandwidth stop signal or a muting drive
output): SD output
• Supports IF count methods
• Variable FM stop sensitivity and bandwidth
• Built-in AM local oscillator buffer
• Supports AM low-cut control
• Pin compatible with the LA1830 (only the DIP
version, the LA1831M is a new product)
• Built-in IF output function for AM stereo
Package Dimensions
unit: mm
3067-DIP24S (LA1831)
*n n n n n n n n n n n no
if
lo Z;
uuuuuuuuuuuy n
21. 2
m
0.48
095 1.78
3112-MFP24S (LA1831M)
*EJLBJJJJJiLMll_ je?t
©1
Sr-r—}2-6
1
-
—=3
u)
-JLM5
0.35
1.0
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Indicator drive current
Allowable power dissipation
Symbol
V c c max
'LED
Pd max
Operating temperature
Storage temperature
Topr
"""•tg
Condition
Pins 6 and 7
Ta £ 70°C (LA1831)
Ta = 70°C (LA1831M)
Rating
9.0
20
400
270
- 2 0 to + 70
- 4 0 to +125
Unit
V
mA
mW
mW
•c
°c
J SANYO Electric Co., Ltd. Semiconductor Business Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10,1 Chomc, Ueno. Taito-ku. TOKYO. 110 JAPAN
J
D0994JN/61893TS A8-9485,9638 No.4298-1/14

PagesPages 14
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