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參數(shù)資料
| 型號： | LA1143 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | FM IF System for Car Radios |
| 中文描述： | 如果系統(tǒng)的汽車收音機調(diào)頻 |
| 文件頁數(shù)： | 3/5頁 |
| 文件大?。?/td> | 124K |
| 代理商： | LA1143 |
LA1143
No.1140-3/5
AC Test Circuit
Unit (resistance :
, capacitance : F)
Muting Characteristic
The muting operation in the LA1143 is performed by an AF preamplifier, the gain of which varies continuously with
control current, and a muting drive circuit which supplies the control current.
The gain of th AF preamplifier decreases with increasing gain control current applied to pin 6. However, the gain does
not decrease further when the control current reaches approximately 120μA or more. The lower limit of the gain under
this condition depends upon a resistor connected between the pin 5 and GND, and the higher the resistance the lower the
gain (the higher the attenuation). Thus the maximum muting attenuation will be set by connecting the resistor between
the pin 5 and GND.
Since the muting control input pin 6 is connected to the base of the emitter-grounded transistor (through a protection
resistor of 500
in series), the voltage between pin 6 and GND is about 0.6V when the control current is applied.
In actual cases, the muting operation is accomplished by applying a voltage drive type muting drive output (pin 14) to
pin 6 through a high resistance (up to 20k
).
The muting drive output comes in three types :
1) Hole detector output which develops a voltage when C/N (carrier-
to-noise ratio) lowers under weak signal input condition.
2) A reversed output of the signal strength indicating output (output
at pin 15).
3) A bandwidth limited muting drive output which develops a
voltage when the AFC output becomes higher than ±VBEduring
detuning operation.
All these outputs are led to an OR circuit and the processed output is
developed at pin 14. Of the above muting drive outputs, descriptions
on the hole detector output and the bandwidth limited muting drive
Continued on next page.
Unit (resistance :
)
T1 : CBTKAC-24782AUO (Toko Co.)
T2 : CBTKAE-24783X (Toko Co.)
22μH : S-220J (Korin Co.)
Input signal strength is an actual
input at pin 1.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LA1145 | FM IF System (Quadrature Detector) for Car Radio |
| LA1145M | FM IF System (Quadrature Detector) for Car Radio |
| LA1150N | FM IF Amplifier for Car Radio |
| LA1175 | FM Front End For Car Radio, Home Stereo Applications |
| LA1175M | FM Front End For Car Radio, Home Stereo Applications |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA1145 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:FM IF System (Quadrature Detector) for Car Radio |
| LA1145M | 制造商:Panasonic Industrial Company 功能描述:IC |
| LA1145M-TLM-E | 功能描述:射頻接收器 CAR RADIO FM IF SYSTEM RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
| LA1150 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| LA1150N | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:FM IF Amplifier for Car Radio |
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