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參數(shù)資料
| 型號(hào)： | LA7976 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | PAL SIF Converter Circuit for TV and VCR Multi-system |
| 中文描述： | PAL制式轉(zhuǎn)換電路的應(yīng)力強(qiáng)度因子的電視和錄像機(jī)多系統(tǒng) |
| 文件頁(yè)數(shù)： | 4/5頁(yè) |
| 文件大?。?/td> | 54K |
| 代理商： | 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.
Use C1
6
20 pF to 47 pF.
.
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.
.
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.
Unit (resistance:
, capacitance: F)
Figure 1
From video
output section
Figure 2
Unit (resistance:
)
Figure 3
Unit (resistance:
)
Figure 5
Figure 4
(Pin 4 oscillation waveform)
Output level
Ceramic BPF
chracteristic
D/U ratio
Figure 6 (5.5 MHz input)
LA7976
No.5559-4/5
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