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參數(shù)資料
| 型號(hào)： | LA7975 |
| 元件分類： | 調(diào)諧器 |
| 英文描述： | 1-BAND, AUDIO TUNER, PSIP5 |
| 封裝： | SIP-5 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 86K |
| 代理商： | LA7975 |
LA7975
No.3994-4/6
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
≈ 20pF to 47pF.
Figure 1
Figure 2
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 80mVp-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.
Input frequency
Oscillator
Pin 5 output
5.5MHz
500kHz
6MHz
6.0MHz
Oscillation stop
6MHz (pass through)
6.5MHz
500kHz
6MHz
4.5MHz
1.5MHz
6MHz
Figure 7
Figure 8 shows a proposed multi-system
Figure 5
(Pin 4 oscillation waveform)
Figure 6
Figure 8
1
200
Ω
5k
Ω
5k
Ω
30pF
R1
1
C2
C1
R
From video
output section
– 60
– 50
– 40
– 30
– 20
– 10
10
0
1M
3
25
10M
73
25
7 100M
Frequency, f – Hz
Attenuation
–
d
B
Filter characteristic
2k
Ω
15
μH
15pF
C2
C1
390
Ω
60pF
50pF
40pF
30pF
15pF
4
1.2k
Ω
1.2k
Ω
400
Ω
VCC
ALC
Figure 4
4
10k
Ω
S1
10k
Ω
500kHz
1.5MHz
(Multi-system implementation)
4
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