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參數資料
| 型號： | LA75676V-S |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | 0.275 INCH, SSOP-24 |
| 文件頁數： | 12/13頁 |
| 文件大?。?/td> | 157K |
| 代理商： | LA75676V-S |
No. 6277-8/13
LA75676V-S
Continued from preceding page.
Pin No.
Pin
Function
Equivalent circuit
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 1.5 Vp-p video signal as its input and amplifies
that to a 2.0 Vp-p level.
Notes on the equalizer amplifier design
The equalizer amplifier is designed as a voltage
follower amplifier with a gain of about 2.3 dB. 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
R1
—— +1
(Vi + Vin) = Vo
× G
Z
G: Gain of the voltage follower amplifier
Vin: Imaginary voltage
G: About 2.3 dB
Assuming Vin
≈ 0, then AV will be:
VoG
R1
AV = —— = —— + 1
Vi
Z
R1 is an IC internal 1 k
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.
6
7
8
EQ amp
6
7
8
2.2k
200
EQ INPUT
EQ OUTPUT
AGC
9.2k
C
R
L = Z
1k
A13272
A13273
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.
9
APC filter
9
1k
1k 1k
A
B
FROM
APC DET
A13274
C
+
R
Continued on next page.
相關PDF資料 |
PDF描述 |
|---|---|
| LA75676VA | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| LA75676VA | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| LA75676V | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| LA75676V | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| LA7567BM | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LA7567B | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:LA7567B, LA7567BM |
| LA7567BM | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:LA7567B, LA7567BM |
| LA7567EV | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:TV and VCR VIF/SIF IF Signal-Processing Circuit with PAL/NTSC Multi-Format Audio Support |
| LA7567GM | 制造商:SANYO 制造商全稱: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 制造商全稱:Sanyo Semicon Device 功能描述:TV and VCR VIF/SIF IF Signal-Processing Circuit with PAL/NTSC Multi-Format Audio Support |
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