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參數資料
| 型號： | LA75600VA |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | 0.225 INCH, SSOP-24 |
| 文件頁數： | 4/16頁 |
| 文件大小： | 386K |
| 代理商： | LA75600VA |
LA75600VA
No.A0325-12/16
Continued from preceding page.
Pin No.
Pin name
Function
Equivalent circuit
6
7
8
VIDEO OUT
EQ FILTER
EQ INPUT
Equalizer circuit.
This circuit corrects the frequency characteristics of the
video signal.
Pin 8 is the input to the EQ amplifier. The EQ amplifier
takes a 1.5Vp-p video signal as its input and amplifies
that to a 2.0Vp-p level.
Notes on the equalizer amplifier design.
The equalizer amplifier is designed as a voltage
follower amplifier with a gain of about 2.3dB.
If frequency characteristics correction is required,
insert the capacitor, inductor, and resistor between
pin 7 and ground in series.
Using the equalizer amplifier.
If the input signal is Vi and the output signal Vo, then
G: Gain of the voltage follower amplifier
Vin: Imaginary voltage
G: About 2.3 dB
Assuming Vin
≈ 0, then AV will be:
R1 is an IC internal 1k
resistor. Simply select a value of
Z according to the desired characteristics.
However, note that the equalizer amplifier gain will be a
maximum at the Z resonance, so care is required to
prevent distortion from occurring.
9
APC FILTER
PLL detector APC filter connection.
The APC time constant is switched internally by the IC.
When locked, the VCO is controlled by the route A, and
the gain is reduced.
When unlocked or during weak field reception, the VCO
is controlled by the route B, and the gain is increased.
We recommend the following values for this APC filter:
R = 150 to 390
C = 0.47
F
Continued on next page.
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