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參數(shù)資料
| 型號(hào)： | LA75525AVA |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | 0.225 INCH, SSOP-24 |
| 文件頁(yè)數(shù)： | 7/10頁(yè) |
| 文件大小： | 171K |
| 代理商： | LA75525AVA |
LA75525AVA
No.A1256-6/10
Pin Function
Pin No.
Pin name
Function
Equivalent circuit
1
SIF INPUT
SIF input. The input impedance is about 1k
. Since buzzing and
buzz beating can occur if interference enters this input pin, care
must be taken when design the pattern layout for this pin. Note
that the video and chrominance signals are especially likely to
interface with the audio signal. Also, the VIF carrier signal can
also cause interference.
By SW1, Gain at the time of Intercarrier and Split system is
switched.
VCC
SW1
200
200
1k
1k
1
2
FM BIAS
FILTER
FM detector bias line filter input.
Used to improve the FM detector signal-to-noise ratio.
C1 should be at least 0.47
F, and 1F is recommended.
If the FM detector is not used, connect pin 2 to ground through a
2k
resister. This stops the FM detector VCO.
5k
2
4k
7k
5k
3.6V
C1
3
SIF CARRIER
OUTPUT
SIF carrier output.
A 200
resister is inserted in series with an emitter-follower
output.
3
200
4
VCC
Use the shortest distance possible when decoupling
Capacitors VCC and ground.
5
VIDEO OUT
6
EQ FILTER
7
EQ INPUT
Equalizer circuit. This circuit is used to correct the video signal
frequency characteristics.
Pin 7 is the EQ amplifier input.
Notes on equalizer amplifier is designed as a gain of about 0dB.
when user for frequency characteristics correction, a capacitor,
inductor, and resistor must be connected in series between pin 6
and ground.
Approach used in the equalizer amplifier If Vi the input signal and
VO is the output signal, then:
R1
2 + 1(Vi + Vin) = VO × G
Where G is the voltage-follower amplifier gain.
Assume:
Vin: Imaginary short
G ≈ 0.
Vin ≈ 0.
Then: AV =
VOG
Vi
=
R1
Z +1
R1 is the IC internal resistance, and is 1k
. In the application
design, simply select Z to correspond to the desired
characteristics. However, since the EQ amplifier gain will be
maximum at the resonant point defined by Z, care is required to
assure that distortion dose not occur.
5
1k
2k
6
C
L
R
7
200
50k
VCC
Continued on next page.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA75525VA | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monolithic Linear IC For TV Sets and VCRs VIF/SIF Signal-Processing IC |
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| LA75600VA | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monolithic Linear IC IF Signal Processing (VIF/SIF) IC for use in TV/VCR Applications |
| LA7565B | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:IF Signal-Processing IC for PAL/NTSC Multi-System Audio TV and VCR Products |
| LA7565BM | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:IF Signal-Processing IC for PAL/NTSC Multi-System Audio TV and VCR Products |
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