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參數(shù)資料
型號: LA7567GM
元件分類: 接收器
英文描述: AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24
封裝: MFP-24
文件頁數(shù): 14/14頁
文件大小: 185K
代理商: LA7567GM
No. 6803-9/14
LA7567GM
Continued from preceding page.
Pin No.
Pin
Description
Equivalent circuit
6
7
8
EQ amp
Equalizer circuit. This circuit is used to correct the video
signal frequency characteristics.
Pin 8 is the EQ amplifier input. This amplifier amplifies a
1.5-V p-p video signal to 2-V p-p.
Notes on equalizer amplifier design
The equalizer amplifier is designed as a voltage follower
amplifier with a gain of about 0 dB. When used for
frequency characteristics correction, a capacitor, inductor,
and resistor must be connected in series between pin 7
and ground.
Approach used in the equalizer amplifier
If vi is the input signal and vo is the output signal, then:
Where G is the voltage-follower amplifier gain.
Assume:
vin: Imaginary short
G: About 0 dB
vin
≈ 0.
Then:
R1 is the IC internal resistance, and is 1 k
. 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 does not occur.
6
7
8
2k
200
EQ INPUT
EQ OUTPUT
AGC
C
R
L =Z
1k
A13683
A13684
9
APC FILTER
PLL detector APC filter connection. The APC time constant
is switched internally in the IC. When locked, the VCO is
controlled by loop A and the loop gain is reduced. When
unlocked and during weak field reception, the VCO is
controlled by loop B and the loop gain is increased.
For this APC filter we recommend:
R = 150 to 390
C = 0.47 F
9
1k
1k 1k
A
B
FROM
APC DET
A13685
C
+
R
R1
—— +1 (vi + vin) = Vo
× G
2
voG
R1
AV = —— = —— +1
vi
Z
Continued on next page.
相關(guān)PDF資料
PDF描述
LA7567GVA AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24
LA7567GVA AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24
LA7567NM AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LA7567N 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:TV and VCR VIF/SIF IF Signal-Processing Circuit with PAL/NTSC Multi-Format Audio Support
LA7567NM 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:TV and VCR VIF/SIF IF Signal-Processing Circuit with PAL/NTSC Multi-Format Audio Support
LA75691 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:IF Signal-Processing IC for PAL/NTSC Multichannel Audio TV and VCR Systems
LA75694M 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Use in TV/VTR Applications IF Signal Processing (VIF/SIF for Hi-Fi)
LA75695VA 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Use in TV/VTR Applications IF Signal Processing (VIF+SIF+SIF converter)
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