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參數(shù)資料
| 型號(hào)： | LA8608V |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | 1.8 V Low-Voltage Narrowband FM-IF System |
| 中文描述： | 1.8 V低電壓窄帶調(diào)頻中頻系統(tǒng) |
| 文件頁數(shù)： | 9/14頁 |
| 文件大小： | 310K |
| 代理商： | LA8608V |
2. About the built-in operational amplifiers
The LA8608V has three independent operational amplifiers on chip that can be used as needed. If they are not to be used, short
the I/O pins.
Sample application 1:
Noise amplifier
Using the three operational amplifiers, it is possible to form a secondary biquad bandpass filter. (For details on the filter
response characteristics, refer to the data provided later.)
The calculation of the transfer function for the above diagram is as shown below.
R
5
C
1
C
2
R
3
R
4
R
6
ω
0
2
=
ω
0
Q
=
1
C
1
R
2
H =
R
2
R
5
R
1
R
4
In normal use, R
3
= R
4
= R
5
= R
6
= R
f
, and C
1
= C
2
= C
f
:
Therefore,
ω
0
=
1
C
f
R
f
Q = C
f
R
2
x
ω
0
H =
R
2
R
f
R
1
R
f
R
2
R
1
f
O
=
1
2
π
C
f
R
f
=
R
2
R
f
=
fo = center frequency, H = pass band gain, Q = selectivity
Fig. 5
LA8608V
No.4077 - 9/14
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