LA7565E View Datasheet(PDF) - SANYO -> Panasonic
Part Name
Description
Manufacturer
LA7565E
SANYO -> Panasonic
LA7565E Datasheet PDF : 18 Pages
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LA7565E, 7565KM
Continued from preceding page.
Pin No.
Pin
5 VCC
Pin function
VCC and ground should be decoupled with as small a
separation as possible.
Equivalent circuit
6
7 EQ amp
8
Connections for the equalizer circuit. This circuit corrects the
frequency characteristics of the video signal.
Pin 8 is the equalizer amplifier input. A 1.5-Vp-p video signal
is input and amplified to 2.0 Vp-p by the equalizer amplifier.
The equalizer amplifier is designed as a voltage-follower
amplifier with a gain of about 2.3 dB. When frequency
characteristic correction is used, a capacitor, an inductor,
and a resistor must be connected in series between pin 7
and ground.
• Using the equalizer amplifier
If vi is the input signal and vo is the output signal, then:
R1/Z + 1 (vi + vin) = Vo × G
Where,
G: Gain of the voltage follower amplifier
vin: Imaginary short
G: About 2.3 dB
Assuming vin ≈ 0:
Then,
AV = voG/vi = R1/Z + 1.
R1 is an IC internal resistor with a value of 1 kΩ. Simply
select a Z according to the desired characteristics. However,
since the equalizer amplifier is maximum at the Z resonance
point, care is required to prevent distortion from occurring at
that frequency.
2 kΩ
1 kΩ
7
C
L =Z
R
EQ INPUT
8
200 Ω
6
EQ OUTPUT
A12056
AGC
A12057
9 APC filter
PLL detector APC filter connection.
The APC time constant is switched internally. When the PLL
is locked, the VCO is controlled over the path marked A in
the figure and the loop gain is lowered. When the PLL is
unlocked and in weak field reception conditions, the VCO is
controlled over the path marked B in the figure and the loop
gain is increased.
We recommend values of:
R = between 150 and 390 Ω, and
C = 0.47 µF
for this APC filter.
FROM
APC DET
A
1 kΩ 1 kΩ 1 kΩ
B
9
A12058
Continued on next page.
No. 6100-11/18
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