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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)： | 7/16頁 |
| 文件大?。?/td> | 293K |
| 代理商： | MF5CWM |
2.0 Modes of Operation
The MF5 is a switched capacitor (sampled data) filter. To
fully describe its transfer functions, a time domain approach
is appropriate. Since this is cumbersome, and since the
MF5 closely approximates continuous filters, the following
discussion is based on the well known frequency domain.
Each MF5 can produce a full 2nd order function. See Table
1 for a summary of the characteristics of the various modes.
MODE 1: Notch 1, Bandpass, Lowpass Outputs:
f
notch
e
f
o
(See Figure 7 )
f
o
e
center frequency of the complex pole pair
e
f
CLK
50
f
notch
e
center frequency of the imaginary zero pair
e
f
o
.
H
OLP
e
Lowpass gain (as f
x
0)
e b
R2
100orf
CLK
R1
H
OBP
e
Bandpass gain (at f
e
f
o
)
e b
R3
R1
H
ON
e
Notch output gain asf
x
0
f
x
f
CLK
/2
eb
R
2
R
1
Q
e
f
o
BW
e
R3
R2
BW
e
the
b
3 dB bandwidth of the bandpass output.
Circuit dynamics:
H
OLP
e
H
OBP
Q
or H
OBP
e
H
OLP
c
Q
e
H
ON
c
Q.
H
OLP(peak)
j
Q
c
H
OLP
(for high Q’s)
MODE 1a: Non-Inverting BP, LP (SeeFigure 8 )
f
o
e
f
CLK
100orf
CLK
50
Q
e
R3
R2
H
OLP
e b
1; H
OLP(peak)
j
Q
c
H
OLP
(for high Q’s)
e b
R3
R2
e
1 (non-inverting)
Circuit dynamics: H
OBP1
e
Q
Note: V
IN
should be driven from a low impedance (
k
1 k
X
)
H
OBP1
H
OBP2
TL/H/5066–16
FIGURE 7. MODE 1
TL/H/5066–17
FIGURE 8. MODE 1a
7
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