參數(shù)資料
型號: MF10CCWM
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 運動控制電子
英文描述: Universal Monolithic Dual Switched Capacitor Filter
中文描述: SWITCHED CAPACITOR FILTER, BUTTERWORTH/BESSEL/CHEBYSHEV, UNIVERSAL, PDSO20
封裝: PLASTIC, SO-20
文件頁數(shù): 9/20頁
文件大小: 405K
代理商: MF10CCWM
2.0 Modes of Operation
The MF10 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
MF10 closely approximates continuous filters, the following
discussion is based on the well know frequency domain.
Each MF10 can produce a full 2nd order function. See Ta-
ble I 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
e
quality factor of the complex pole pair
e
the
b
3 dB bandwidth of the bandpass output.
Circuit dynamics:
BW
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
100
orf
CLK
50
Q
e
R3
R2
H
OLP
e b
1; H
OLP(peak)
j
Q
c
H
OLP
(for high Q’s)
H
OBP1
e b
R3
R2
H
OBP2
e
1 (Non-Inverting)
Circuit Dynamics: H
OBP1
e
Q
Note:
V
IN
should be driven from a low impedance (
k
1 k
X
) source.
TL/H/10399–16
FIGURE 7. MODE 1
TL/H/10399–17
FIGURE 8. MODE 1a
9
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