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参数资料
| 型号： | LA7567EV |
| 厂商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封装： | 0.275 INCH, SSOP-24 |
| 文件页数： | 8/21页 |
| 文件大小： | 208K |
| 代理商： | LA7567EV |
No.7779-16/21
LA7567EV
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
1.5Vp-p video signal to 2Vp-p.
Notes on equalizer amplifier design
The equalizer amplifier is designed as a voltage follower
amplifier with a gain of about 2.3dB. 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 2.3dB
vin
≈ 0.
Then:
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 does not occur.
6
7
2k
EQ OUTPUT
9.2k
C
R
L =Z
1k
ILA06692
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 = 0.47F
9
1k
1k
1k
A
B
FROM
ILA06694
C
+
R
APC DET
R1
—— +1 (vi + vin) = Vo
× G
2
voG
R1
AV = —— = —— +1
vi
Z
Continued on next page.
8
200
EQ INPUT
AGC
ILA06693
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相关代理商/技术参数 |
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|---|---|
| LA7567GM | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:TV and VCR VIF/SIF IF Signal-Processing Circuit with NTSC SPLIT Support |
| LA7567N | 制造商:SANYO 制造商全称: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 制造商全称: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 制造商全称: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 制造商全称:Sanyo Semicon Device 功能描述:For Use in TV/VTR Applications IF Signal Processing (VIF/SIF for Hi-Fi) |
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