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參數(shù)資料
| 型號： | LA1135 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | AM Tuner System for Car Radios and Home Stereos(應(yīng)用于車載電臺和家庭立體聲的AM調(diào)諧器) |
| 中文描述： | 上午調(diào)諧器系統(tǒng)的汽車收音機和家庭音響（應(yīng)用于車載電臺和家庭立體聲的上午調(diào)諧器） |
| 文件頁數(shù)： | 7/18頁 |
| 文件大小： | 455K |
| 代理商： | LA1135 |
7.
Meaning of L2
If the RF stage is double-tunned, the difference in sensitivity within the RF band almost disappears, but an antireasonance
point of approximately 20 MHz appears, thereby leading to worse spurious characteristics. So, L2 is used to remove the SW
band.
8.
Wide-band AGC
This IC contains 2-channel wide-band AGC. Pin 6 detects an undesired signal within the RF band and wide-band AGC is
applied. This detection sensitivity is determined inside the IC. Pin 2 detects an undesired signal outside the RF band. This
detection sensitivity is determined by R3. When 1 mVrms (f = 1 MHz) signal is applied to pin 2, AGC operates.
9.
Measures against suppression of sensitivity
In the AGC circuit of the test circuit the presence of an undesired signal of high strength within the receiving band may cause
the desired signal to be suppressed when the desired signal is low or medium in strength. Shown below is the circuit
configuration where the necessary measures are taken against this suppression.
10. Transient response of S meter output at search, stop mode
The circuit configuration shown below is available to stabilize the transient response of the S meter output at the search, stop
mode.
11. When using LW (approximately 50°C or greater), additionally connect a resistor of 27 k
across pins 18 and 19 against
increase in local oscillation level. When using MW, no additional resistor is required.
12. Improvement in image frequency interference
Change the RF double-tuning coil as follows, and the image frequency interference becomes 63 dB at f
r
= 1400 kHz.
(Q of the tuning circuit must not be decreased with resistor 100 k
.)
Continued on next page.
No. 1272-7/18
S meter output
Wide-band
AGC input
Wide-band
AGC
circuit
Circuit added
Sample constants
R
A
= 4.3 k
R
B
= 3.0 k
(V
SM
-130 = 5.0 V)
ANT
damping
driver circuit
ANT
damping pin
Signal during searching from PLL
Unit (resistance:
)
LA1135, 1135M
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PDF描述 |
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| LA1136N | AM Tuners for Car Radios and Home Stereos(應(yīng)用于車載電臺和家庭立體聲的AM調(diào)諧器) |
| LA1140 | FM IF System for Car Radio |
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相關(guān)代理商/技術(shù)參數(shù) |
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| LA11352 | 制造商:Square D by Schneider Electric 功能描述:CIRCUIT BREAKER AUXILIARY SWITCH 2A/2B |
| LA1135M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM Tuner System for Car Radios and Home Stereos |
| LA1136 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM Tuners for Car Radios and Home Stereos |
| LA1136M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LA1136N | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM Tuners for Car Radios and Home Stereos |
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