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参数资料
| 型号： | MF5CWM |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | MF5 Universal Monolithic Switched Capacitor Filter |
| 中文描述： | SWITCHED CAPACITOR FILTER, RESISTOR PROGRAMMABLE, UNIVERSAL, PDSO14 |
| 封装： | SO-14 |
| 文件页数： | 9/16页 |
| 文件大小： | 293K |
| 代理商： | MF5CWM |
2.0 Modes of Operation
(Continued)
c
MODE 3a: HP, BP, LP and Notch with External Op amp
(SeeFigure 11 )
f
o
e
f
CLK
100
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
e
gain of notch at f
e
f
o
e
ó
Q
#
R1
H
OLP
e b
R4
R1
f
n
e
notch frequency
e
f
CLK
e
gain of notch
#
as f
x
f
CLK
100
0
R
h
R
l
orf
CLK
50
0
R
h
R
l
H
on
R
g
R
l
H
OLP
b
R
g
R
h
H
OHP
Jó
H
n1
e
gain of notch (as f
x
0)
e
R
g
R
l
c
H
OLP
H
n2
2
J
e b
R
g
R
h
c
H
OHP
MODE 4: Allpass, Bandpass, Lowpass Outputs (See
Figure 12 )
e
center frequency
e
f
CLK
f
*
z
e
center frequency of the complex zero pair
j
f
o
f
o
BW
f
o
100orf
CLK
Q
e
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/5066–20
FIGURE 11. MODE 3a
TL/H/5066–21
FIGURE 12. MODE 4
9
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