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LA7567N 数据表(PDF) 9 Page - Sanyo Semicon Device

部件名 LA7567N
功能描述  TV and VCR VIF/SIF IF Signal-Processing Circuit with PAL/NTSC Multi-Format Audio Support
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制造商  SANYO [Sanyo Semicon Device]
网页  https://www.sanyo-av.com/us/
标志 SANYO - Sanyo Semicon Device

LA7567N 数据表(HTML) 9 Page - Sanyo Semicon Device

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No. 5765-9/14
LA7567N, 7567NM
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 17 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 2.3 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 2.3 dB
vin
≈ 0.
Then:
• R1 is the IC internal resistance, and is 1 k
Ω. 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.
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 µF
R1
—— +1 (vi + vin) = Vo
× G
2
voG
R1
AV = —— = —— +1
vi
Z
Continued on next page.


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