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參數(shù)資料
| 型號： | LA7566 |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP24 |
| 封裝： | SDIP-24 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 233K |
| 代理商： | LA7566 |
No. 5764-8/11
LA7566
Continued from preceding page.
Pin No.
Symbol
Pin function
Equivalent circuit
11
12
VCO
VCO tank circuit used for video detection.
See the separately provided documentation for the tank circuit
coil (inductor) specifications.
13
14
VIDEO OUT
EQ FILTER
Equalizer circuit. This circuit corrects the video signal frequency
characteristics.
Notes on equalizer amplifier design:
The equalizer amplifier is designed as a voltage follower
amplifier with a gain of about 2.3 dB. When the frequency
characteristics are corrected, connect an inductor, a capacitor,
and a resistor in series between pin 14 and ground.
The equalizer amplifier gain is given by:
R1
AV = —— + 1
Z
Here, R1 is an IC internal resistor with a value of 1 k
. Select Z
according to the desired characteristics. However, care is
required to prevent distortion at the resonant point determined
by Z, where the gain is maximum.
15
16
PAL VIDEO IN
NT VIDEO IN
Equalizer amplifier inputs.
Pin 15 is for PAL, and pin 16 for NTSC format signals. These
inputs are linked to and switched by the SIF switches.
17
APC FILTER
PLL detector APC filter connection.
The APC time constants are switched internally in the IC. When
locked, the VCO is controlled over the path A, and the loop gain
is reduced. When unlocked and during weak field reception, the
VCO is controlled over the path B, thus increasing the loop
gain.
We recommend values of:
R = 150 to 390
, and
C = 0.47 F
for the loop filter constants.
Continued on next page.
相關PDF資料 |
PDF描述 |
|---|---|
| LA75675M-S | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| LA75675M-S | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| LA75676M | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| LA75676M | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| LA75676NVA | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LA75665M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LA75665NM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LA75665NV | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LA75675M-S | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:VIF/SIF IF Signal-Processing Circuit that Supports NTSC Intercarrier for TV and VCR Products |
| LA75676M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For TV and VCR Products IF Signal Processor (VIF+SIF) |
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