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參數(shù)資料
| 型號(hào)： | LA7567BVA |
| 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： | 0.225 INCH, SSOP-24 |
| 文件頁(yè)數(shù)： | 8/20頁(yè) |
| 文件大?。?/td> | 184K |
| 代理商： | LA7567BVA |
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Pin No.
Pin
Description
Equivalent circuit
No.7939-16/20
LA7567BVA
Equalizer circuit
This circuit corrects the video signal frequency
characteristics.
Pin 8 is the equalizer amplifier input.
A 1.5Vp-p signal is input and the equalizer amplifier
amplifies it to 2Vp-p.
Equalizer amplifier design
The equalizer amplifier is designed as a voltage
follower with about 2.3dB of gain. Insert an
inductor, a capacitor, and a resistor in series
between pin 7 and ground if frequency
characteristics correction is required.
Equation amplifier notes
If vi is the input signal and vo the output, this
amplifier operates as follows.
G: Voltage follower amplifier gain
vin: Imaginary short
G: About 2.3dB
Assuming vin is close to 0:
R1 is an IC internal resistor, and is 1k
. Z may be
chosen to match the desired characteristics.
However, since the equalizer amplifier gain is at its
maximum at Z's resonance point, care is required
to assure that distortion does not occur.
6
7
8
EQ amp
ILA06803
ILA06804
ILA06805
6
7
8
2k
200
EQ INPUT
EQ OUTPUT
AGC
9.2k
C
R
L=Z
1k
9
1k
1k 1k
A
B
FROM
APC DET
C
+
R
Continued on next page.
Continued from preceding page.
R1
—— +1 (vi + vin) = Vo
× G
Z
voG
R1
AV = —— = —— +1
vi
Z
9
PLL detector APC filter connection
The APC time constant is switched internally in the
IC. When locked, the VCO is controlled by the
route A and the loop gain is lowered.
When unlocked and during weak field reception,
the VCO is controlled by the route B and the loop
gain is increased.
R = 150 to 390
0.47F is the recommended value for C.
APC FILTER
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