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參數資料
| 型號： | LA7565BM |
| 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： | 2/17頁 |
| 文件大小： | 292K |
| 代理商： | LA7565BM |
No. 5636-10/17
LA7565B, 7565BM
Pin No.
Pin
Pin function
Equivalent circuit
5
6
7
8
VCC
EQ amp
VCC and ground should be decoupled with as small a
separation as possible.
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 k
. 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.
Continued from preceding page.
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
, and
C = 0.47 F
for this APC filter.
Continued on next page.
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