LA7976 查看數據表（PDF） - SANYO -> Panasonic

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LA7976

PAL SIF Converter Circuit for TV and VCR Multi-system

SANYO -> Panasonic 

LA7976

. Pin 1 is the SIF input pin.

The filter in Figure 2 can be connected to the input section

to improve the buzz characteristic.

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.

Figure 1

Unit (resistance: Ω, capacitance: F)

From video

output section

Use C1 6 20 pF to 47 pF.

Figure 2

. 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 4.

Figure 4

(Pin 4 oscillation waveform)

Figure 3

Unit (resistance: Ω)

. Pin 5 is the output pin. The output from Pin 5 is input to the

SIF via a 6 MHz bandpass filter (BPF).

When 5.5 MHz is input to Pin 1, the spectrum shown in

Figure 6 is obtained at Pin 5.

Output level

Ceramic BPF

chracteristic

D/U ratio

Figure 5 Unit (resistance: Ω)

Figure 6 (5.5 MHz input)

No.5559-4/5

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