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參數資料
| 型號： | LA7567NM |
| 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： | 13/14頁 |
| 文件大小： | 276K |
| 代理商： | LA7567NM |
No. 5765-8/14
LA7567N, 7567NM
Pin Descriptions
Pin No.
Pin
Description
Equivalent circuit
1
SIF INPUT
SIF input. The input impedance is about 1 k
. Since
buzzing and buzz beating can occur if interference enters
this input pin, care must be taken when design the pattern
layout for this pin. Note that the video and chrominance
signals are especially likely to interfere with the audio
signal. Also, the VIF carrier signal can also cause
interference.
2
FM power supply filter
FM detector bias line filter input. Used to improve the FM
detector signal-to-noise ratio.
C1 should be at least 0.47 F, and 1 F is recommended.
If the FM detector is not used, connect pin 2 to ground
through a 2-k
resistor. This stops the FM detector VCO.
3
4
SIF converter
Pin 3 is the SIF converter output. The signal is passed
through a 6-MHz bandpass filter and input to the SIF
circuit. There is a 200-
resistor in series with the emitter-
follower output.
Pin 4 is the SIF converter 500-kHz oscillator connection.
Since this oscillator circuit includes an ALC, the oscillator
level is held fixed at a low level. If this circuit is not used,
connect pin 4 to ground through a 10-k
external resistor.
Providing this external resistor stops the 500-kHz oscillator
and allows the converter to be used as an amplifier.
5
VCC
Use the shortest distance possible when decoupling VCC
and ground.
Continued on next page.
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