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參數資料
| 型號： | LA7975 |
| 元件分類： | 調諧器 |
| 英文描述： | 1-BAND, AUDIO TUNER, PSIP5 |
| 封裝： | SIP-5 |
| 文件頁數： | 5/6頁 |
| 文件大?。?/td> | 86K |
| 代理商： | LA7975 |
LA7975
No.3994-5/6
Pin 5 is the output pin. The output from Pin 5 is input to the
SIF via a 6MHz bandpass filter (BPF).
When 5.5MHz is input to Pin 1, the spectrum shown in Figure
10 is obtained at Pin 5. Even if there is a 5.85MHz NICAM
signal, the D/U (desirable/undesirable) ratio at Pin 5 increases
and the buzz characteristic does not deteriorate.
When 6MHz is input at Pin 1 and there is a 6.552MHz
NICAM signal, then 6.552MHz is mixed with 500kHz to
make 6.052MHz. This becomes an interference signal and is
within the band for 6MHz. Therefore,for 6MHz input, Pin 4 is
grounded with 10k
Ω to stop the oscillation and pass through
the input signal 6MHz as is.
Figure 9
Figure 10 (5.5MHz input)
Figure 11 (6MHz input)
Reference Characteristic Diagram
5
150
Ω
3k
Ω
200
Ω
1k
Ω
200
Ω
150
Ω
VCC
500kHz
freq.
5
6 6.35
5.5
5.85 (NICAM Carrier)
D/U ratio
Ceramic BPF
chracteristic
Output level
6.052
500kHz
freq.
6
6.5
5.5
6.552 (NICAM Carrier)
D/U
ratio
Interference obtained with LA7975 mixer
6.552MHz - 500kHz = 6.052MHz
Output level
LA7975
+
10k
Ω
51k
Ω
0.01
μF
S1
VCC = 9V
SG
40
60
50
70
80
90
100
110
120
40
50
80
90
100
60
70
110
20
60
40
80
100
120
4
28
612
10
16
18
14
140
Input level – dB/
μV
Output
level,
V
O
–
dB/
μ
V
020
Supply voltage, VCC –V
Output
level,
V
O
–
dB/
μ
V
Input/output characteristic
VO – VCC
* Input level 80dB/
μV S1 on
for 6MHz measurement
6MHz
5.5MHz
6.5MHz
6MHz
5.5MHz, 6.5MHz
* S1 on for 6MHz
measurement
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