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参数资料
| 型号： | MF10ACN |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | Universal Monolithic Dual Switched Capacitor Filter |
| 中文描述： | SWITCHED CAPACITOR FILTER, BUTTERWORTH/BESSEL/CHEBYSHEV, UNIVERSAL, PDIP20 |
| 封装： | PLASTIC, DIP-20 |
| 文件页数： | 11/20页 |
| 文件大小： | 405K |
| 代理商： | MF10ACN |
2.0 Modes of Operation
(Continued)
MODE 3a: HP, BP, LP and Notch with External Op Amp
(SeeFigure 11 )
f
O
e
f
CLK
100
c
R2
R4orf
CLK
50
c
R2
R4
Q
e
R2
R4
c
R3
R2
H
OHP
e b
R2
R1
H
OBP
e b
R3
R1
H
OLP
e b
R4
R1
f
n
e
notch frequency
e
f
CLK
100
0
R
h
R
I
2
J
orf
CLK
50
0
R
h
R
I
H
ON
e
gain of notch at
e
gain of notch
as f
x
f
e
f
O
e
àà
Q
#
R
g
R
I
H
OLP
b
R
g
R
h
H
OHP
Jàà
H
n1
e
gain of notch (as f
x
0)
e
R
g
R
I
c
H
OLP
H
n2
f
CLK
e b
R
g
R
h
c
H
OHP
MODE 4: Allpass, Bandpass, Lowpass Outputs
(SeeFigure 12 )
e
center frequency
e
f
CLK
100
f
z
*
e
center frequency of the complex zero
&
f
O
e
f
O
BW
f
O
orf
CLK
Q
e
R3
Q
Z
e
quality factor of complex zero pair
e
R3
e b
#
R1
H
OBP
e
Bandpass gain (at f
e
f
O
)
e b
R3
R1
For AP output make R1
e
R2
H
OAP
*
e
Allpass gain
#
at 0
k
f
k
f
CLK
H
OLP
e
Lowpass gain (as f
x
0)
R2
2
J
R2
J
e b
R2
R1
e b
1
a
1
J
e b
2
R2
#
1
a
R2
R1
J
e b
2
#
R3
Circuit Dynamics: H
OBP
e
(H
OLP
)
c
Q
e
(H
OAP
a
1)Q
*
Due to the sampled data nature of the filter, a slight mismatch of f
z
and f
O
occurs causing a 0.4 dB peaking around f
O
of the allpass filter amplitude
response (which theoretically should be a straight line). If this is unaccept-
able, Mode 5 is recommended.
TL/H/10399–20
FIGURE 11. MODE 3a
TL/H/10399–21
FIGURE 12. MODE 4
11
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