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PDF LA1143 Data sheet ( Hoja de datos )
| Número de pieza | LA1143 | |
| Descripción | FM IF System for Car Radios | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : EN1140D
Monolithic Linear IC
LA1143
FM IF System for Car Radios
Overview
The LA1143 is an IF system IC designed for FM car stereo
receivers. It features versatile muting characteristics and
allows receiver designers to realize the muting
performance according to their design concept. Since the
muting characteristics can be varied with a switch or a
semi-fixed resistor, DX-Local switching will be
accomplished with ease.
Package Dimensions
unit: mm
3006B-DIP16
[LA1143]
Functions
• IF amplification/limiter
• AF preamplifier
• Signal meter output
• Muting at detuning
• Quadrature detector
• AFC output
• AGC output
• Muting at small input
SANYO: DIP16
Features
1. Versatile mutings
a) When muting operation is performed under a weak signal strength, an attenuation slope of the audio output against
the input signal strength variations can be set at any given value.
b) Maximum muting attenuation can be selected to be approximately 6 to 40dB.
c) Input signal strength level which actuates the muting circuit can be set freely.
2. High limiting sensitivity (25 dBµ typ. with muting off) provides a good quieting characteristic.
3. High S/N (78dB typ.)
4. Low distortion (0.05% typ.) available, if used with double-tuned circuits.
5. Good AMR (63dB with 6 stages of differential IF amplifiers).
6. Signal meter drive output proportional to the input signal strength in dB (suitable to control multiplex IC LA3373).
7. Clamped (±VBE) AFC output, bandwidth adjustable.
8. Delayed AGC output for front end circuit.
Equivalent Circuit Block Diagram
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
91297HA (KT)/D157KI/2126KI/5085MW/D142KI, TS No.1140-1/5
1 page  
LA1143
Pd max – Ta
Muting by varying R15-G
Muting by varying R14-6
Ambient temperature, Ta – °C
Proper cares in using LA1143
1. The detector transformers should be designed to develop a quadrature signal (pin 11) of higher than 175mVrms
(about 105dBµ) under high antenna signal input. If the quadrature signal strength is less than 125mVrms, the
muting drive output can not decrease to zero even in a strong signal strength. Furthermore, when the quadrature
signal strength lies between 125mV and 175mV, the muting drive output may move from zero to plus under high
temperature conditions.
2. Do not connect a capacitor directly between pin (16) and ground. If the signal intensity of IF input varies in the
vicinity of 90dBµ, the voltage at pin (16) varies. Thus, charging/discharging current flows into the capacitor and
goes to the muting drive output (pin (14)) through the inverter inside the IC, thereby causing the muting to
malfunction.
For detailed data and sample application circuits, refer to the catalog of the LA1140.
No products described or contained herein are intended for use in surgical implants, life-support systems,
aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and
the like, the failure of which may directly or indirectly cause injury, death or property lose.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates,
subsidiaries and distributors and all their officers and employees, jointly and severally, against any
and all claims and litigation and all damages, cost and expenses associated with such use:
Not impose any responsibilty for any fault or negligence which may be cited in any such claim or
litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of
their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guarant-
eed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees
are made or implied regarding its use or any infringements of intellectual property rights or other rights of
third parties.
This catalog provides information as of September, 1997. Specifications and information herein are
subject to change without notice.
No.1140-5/5
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet LA1143.PDF ] | |
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