LA7975 View Datasheet(PDF) - SANYO -> Panasonic
Part Name
Description
Manufacturer
LA7975 Datasheet PDF : 6 Pages
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LA7975
. Pin 1 is the SIF input pin.
The filter in Figure 2 can be connected to the input section
to improve the buzz characteristic.
Figure 3 shows the characteristics for the filter in Figure 2.
If C1 is too small, the buzz characteristic improves for
normal input, but the filter cuts into the sound carrier and the
buzz characteristic deteriorates for the P/S (picture/sound
carrier) ratio.
Use C1 6 20 pF to 47 pF.
Figure 1
Unit (resistance: Ω, capacitance: F)
Filter characteristic
From video
output section
Figure 2
Unit (resistance: Ω, capacitance: F)
Frequency – Hz
Figure 3
. Pin 4 is the ceramic oscillator pin.
To make the oscillation waveform approach a sine wave,the
oscillation level is controlled internally.
Oscillation levels of 15 to 80 mVp-p at Pin 4 give the
waveform shown in Figure 5.
To stop oscillation, attach an external resistor as in Figure 6
and switch S1 on.
Here are the conditions for handling multiple systems.
Figure 4
Unit (resistance: Ω)
Figure 5
(Pin 4 oscillation waveform)
Input frequency
5.5 MHz
6.0 MHz
6.5 MHz
4.5 MHz
Oscillator
500 kHz
Oscillation stop
500 kHz
1.5 MHz
Pin 5 output
6 MHz
6 MHz
(pass through)
6 MHz
6 MHz
Figure 7
Figure 8 shows a proposed multi-system
Figure 6
Unit (resistance: Ω)
(Multi-system implementation)
Figure 8
Unit (resistance: Ω)
No.3994-4/6
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