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參數資料
| 型號： | LA7567EV |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 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： | 8/21頁 |
| 文件大?。?/td> | 208K |
| 代理商： | LA7567EV |
No.7779-16/21
LA7567EV
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 8 is the EQ amplifier input. This amplifier amplifies a
1.5Vp-p video signal to 2Vp-p.
Notes on equalizer amplifier design
The equalizer amplifier is designed as a voltage follower
amplifier with a gain of about 2.3dB. 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 2.3dB
vin
≈ 0.
Then:
R1 is the IC internal resistance, and is 1k
. 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.
6
7
2k
EQ OUTPUT
9.2k
C
R
L =Z
1k
ILA06692
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 = 0.47F
9
1k
1k
1k
A
B
FROM
ILA06694
C
+
R
APC DET
R1
—— +1 (vi + vin) = Vo
× G
2
voG
R1
AV = —— = —— +1
vi
Z
Continued on next page.
8
200
EQ INPUT
AGC
ILA06693
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