Pin Descriptions
Pin No.
Pin
LA7567GM
Description
Equivalent circuit
• SIF input. The input impedance is about 1 kΩ. Since
buzzing and buzz beating can occur if interference enters
this input pin, care must be taken when design the pattern
1
SIF INPUT
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.
• FM detector bias line filter input. Used to improve the FM
detector signal-to-noise ratio.
2
FM power supply filter C1 should be at least 0.47 µF, and 1 µF is recommended.
If the FM detector is not used, connect pin 2 to ground
through a 2-kΩ resistor. This stops the FM detector VCO.
1
1kΩ
1kΩ
A13680
3.6V
5kΩ
5kΩ
18kΩ
2
C1
A13681
3
200Ω
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.
A12030
10kΩ
4
5
VCC
• Use the shortest distance possible when decoupling VCC
and ground.
400Ω
4(R)
A13682
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