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參數(shù)資料
| 型號： | MF5CWM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | MF5 Universal Monolithic Switched Capacitor Filter |
| 中文描述： | SWITCHED CAPACITOR FILTER, RESISTOR PROGRAMMABLE, UNIVERSAL, PDSO14 |
| 封裝： | SO-14 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大小： | 293K |
| 代理商： | MF5CWM |
2.0 Modes of Operation
(Continued)
MODE 2: Notch 2, Bandpass, Lowpass: f
notch
k
f
o
(See Figure 9 )
e
center frequency
e
f
CLK
R4
f
o
100
R2
a
1 orf
CLK
50
R2
R4
a
1
f
notch
e
f
CLK
100orf
CLK
e
quality factor of the complex pole pair
50
Q
e
0
R2/R4
a
1
R2/R3
H
OLP
e
Lowpass output gain (as f
x
0)
R2/R1
R2/R4
a
1
H
OBP
e
Bandpass output gain (at f
e
f
o
)
e b
R3/R1
H
ON1
e
Notch output gain (as f
x
0)
R2/R1
R2/R4
a
1
e b
e b
H
ON2
e
Notch output gain
#
as f
x
f
CLK
Filter dynamics: H
OBP
e
Q
0
H
OLP
H
ON2
e
Q
0
H
ON1
H
ON2
2
J
e b
R2/R1
MODE 3: Highpass, Bandpass, Lowpass Outputs
(See Figure 10 )
e
0
R4
f
o
e
f
CLK
100
e
quality factor of the complex pole pair
R2
c
R3
R2
c
0
R2
R4orf
CLK
50
c
0
R2
2
J
R4
Q
H
OHP
e
Highpass gain
#
as f
x
f
CLK
e b
R2
R1
H
OBP
e
Bandpass gain (at f
e
f
o
)
e b
R3
R1
H
OLP
e
Lowpass gain (as f
x
0)
e b
R4
R1
Circuit dynamics:R4
e
H
OHP
H
OLP
; H
OBP
e
0
H
OHP
c
H
OLP
c
Q
H
OLP(peak)
j
Q
c
H
OLP
(for high Q’s)
H
OHP(peak)
j
Q
c
H
OHP
(for high Q’s)
TL/H/5066–18
FIGURE 9. MODE 2
TL/H/5066–19
FIGURE 10. MODE 3
*
In Mode 3, the feedback loop is closed around
the input summing amplifier; the finite GBW prod-
uct of this op amp causes a slight Q enhance-
ment. If this is a problem, connect a small capaci-
tor (10 pF–100 pF) across R4 to provide some
phase lead.
8
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