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PDF LA1831 Data sheet ( Hoja de datos )
| Número de pieza | LA1831 | |
| Descripción | Support for AM Stereo and Electronic Tuning Single Chip Music Center IC | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LA1831 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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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
1 page  
LA1831, 1831M
Pin Functions and No-Signal Voltages
No. Function
1 FM IF input
Pin voltage (V)
2.1
Equivalent circuit
©—i
©—<
r1
^
2 AM MIX output
5.0
3 REG
2.1
4 AM IF input
2.1
5 GND
0
6 Tu-LED
5.0
7 IF output for ST-LED
and AM stereo
\>
c
E
© — 1;
[H
(f Cp
11— 1
C
8 FM-DET
2.8 (FM)
3.4 (AM)
9 Vcc
10 AM/FM
IF count output
control SW, and
mute SW
5.0
0
11 Phase comparator
filter pin, and
AM/FM switch
12
Pin 11
3.8 (FM)
1.5 (AM)
Pin 12
3.8 (FM)
0 (AM)
\
—c
DI
J
-
T
i
r
^
©
5!
-r
i
H
Notes
Input impedance ri = 330 CI
Used for the MIX coil between pin 2 and pin 9
(the V c c voltage)
Vrt,-2.1 V
Input impedance r( = 2 KO
Active-(L)
Open collector
Recommended ceramic discriminator:
CDA10.7MG43 (Murata, Ltd)
IF count and mute are turned on when
V,o > 3.0 V
Note: During seek, the IF buffer is output
only in the SD on state.
AM mode is selected when over 200 nA flows
from pin 12
Continued on next page.
No.4298- 5/14
5 Page 
LA1831, 1831M
i
%
•e
g3
D
X
§1
o
•B
FM temperature characteristics (3)
Vin=l
Jf
f c = 10.7 MHz
Vin=100c!fl/i
fm=lkHz
75 kHz dev
®>
5390
lLcDA10.7MG 13
rn
THD
-20 0 20 40 60
Ambient temperature, Ta - "C
80
AM temperature characteristics (1)
f c - l W IHz
f m - l l iHs
30 % m od
-10
J \ Detector output (Vin = ;0 dBji)
-20
J
_23dB#
100
a . *30-
tf
3.0
AM temperature
f
f
cm==l Ml lHlHzZ
characteristics
(2)
l
QSP3'2.0
30% mod
Io
1.0
A
5
u
40
e=at
4 30
20
3-0
>
I
.<2.0
uu<S t . O
f\ AC!C volta ;e (Vin = 80 dB Lt)
20dB^i
. No signal
1
KJ
S o -20 0 20 60 60 80
Ambient temperature, Ta - °C
AM FM temperature characteristics
340 Measu red with the loac pin opc-n.
100
300 vcc -
1260
Vosc 3uff
§5.Ik
^ \ IF Buff
©
220
FM
180
no
10-04. 0
-20 0 20 40- 60
Ambient temperature, Ta - °C
80
100
60
S/
50
60
30
5/ 'N
23da^
20
1-0t,0 -20 0 20 40 60 60 100
Ambient temperature, Ta - °C
THD-Ta
VCC=5V
100dB/i75kHz d e v
L4-R=90%
0 20 40 60 80
Ambient temperature, Ta - °C
No.4298- 11/14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LA1831.PDF ] | |
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