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PDF LA1060 Data sheet ( Hoja de datos )
| Número de pieza | LA1060 | |
| Descripción | Antenna Switching Diversity Circuit for Car-Use FM Tuners | |
| Fabricantes | Sanyo Semicon Device | |
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Hay una vista previa y un enlace de descarga de LA1060 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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Ordering number : EN2650B
Monolithic Linear IC
LA1060
Antenna Switching Diversity Circuit
for Car-Use FM Tuners
Functions
• Noise amp, noise AGC circuit, noise density circuit.
• Antenna switching trigger output circuit.
• Antenna switching T flip-flop circuit.
• Antenna holding function to be used at weak input signal
reception mode, forced antenna holding function.
Package Dimensions
unit: mm
3017B-SIP9
[LA1060]
Features
• "Count system"-used, reliable detection of multipath
distortion.
• One-tuner type diversity system allowing cost reduction
of sets.
• The output to hold the antenna at the weak input signal
mode and the output (antenna switching trigger output) to
indicate that the antenna switching frequency is high are
delivered at the same pin, allowing a wide variety of
applications according to the design concept of set.
Specifications
Maximum Ratings at Ta=25°C
Parameter
Symbol
Maximum supply voltage
VCC max
Maximum flow-out
I4 max
I6 max
I7 max
I8 max
Maximum flow-in current
I6 max
Allowable power dissipation
Pd max
Operating temperature
Topr
Storage temperature
Tstg
Conditions
Ta≤75°C
SANYO: SIP9
Ratings
16
1
2
10
10
10
200
–20 to +75
–40 to +125
Unit
V
mA
mA
mA
mA
mA
mW
°C
°C
Operating Conditions at Ta=25°C
Parameter
Symbol
Recommended supply voltage VCC
Operating voltage range
VCC op
Conditions
Ratings
8
6.5 to 15
Unit
V
V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
82997HA (KT)/7119YT/D147TA/N196AT, TS No.2650-1/8
1 page  
LA1060
Noise Detection Method of the LA1060
(1) "Count system"-used noise detection
• The LA 1060 is so designed as to count the noise components of 100kHz or greater in the IF output to detect the
multipath distortion.
• Car-use FM tuners are always affected by noises shown below.
(1) Ignition noise
(2) Noise attendant on modulation.
The actual modulation signal is not a continuous wave, but an intermittent signal. When the modulation signal
rises in a burst fashion, the high frequency noise components are detected in the FM demodulation output
(because in a burst fashion, overmodulation may occur or the signal rise characteristic may include the high
frequency components.)
(3) Random noise
The random noise at the weak input signal mode includes some noise components whose peak value is two to
three times as high as the average noise level.
• As a result of checking the above-mentioned noises, we found that the noise of more than a given level being
present within a given period of time (example : within 100µs) is included in the FM demodulation output of car-
use FM tuners at less than a given density only.
• By contrast, when the multipath distortion or skip noise occurs, the continuous noise components occur and the
above-mentioned noise density increases.
• Therefore, by using "count system" to count the noise density, the detection of multipath distortion and skip noise
detection can be performed with less malfunction.
(2) Noise detection time
• It is desirable that the noise detection time is faster (Note 1). However, the noise detection time (noise count time)
of the LA1060 is approximately 100µs so that the above-mentioned three types of noise cause no malfunction to
occur.
(Note 1) • If the period of noise duration is 20µs or less, the noise is hardly offensive to the ears. If the period of noise
duration is 50 to 200µs, the noise is heard as a sound "buzz", but a single noise is hardly offensive to the ears.
• If the period of noise duration is 500µs or more, the noise is heard as a sound "zah" which is offensive to the
ears.
Sample Application Circuit 2
Unit (resistance : Ω, capacitance : F)
No2650-5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LA1060.PDF ] | |
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