lmf60 National Semiconductor Corporation, lmf60 Datasheet - Page 18

• Manufacturer Part Number: lmf60
• Description: High Performance 6th-order Switched Capacitor Butterworth Lowpass Filter
• Manufacturer: National Semiconductor Corporation

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2 0 Designing with the LMF60
www national com
FIGURE 15 Second Order Butterworth Anti-Aliasing Filter Using Uncommitted Op-Amp
f
H
Design Procedure
pick C
R
for a 2nd Order Butterworth Q
R
make R
and
C
Note The parallel combination of R
0
0
2
2
2
e
e
e
e
e
2
2QC
0 113
(2
1
q
R
C
1
4
q
1
0
f
R
1
e
f
0
R
0
1
1
R
0
1
1
3
R
R
1
0
(H
2
2
)
2
C
0
C
1
C
1
e
2
1 when R
3
e
and R
0 707
4
(if used) R
4
(Continued)
are omitted and V
1
and R
18
2
O2
should be
is directly tied to INV2)
t
10 kX in order not to load Op-Amp
2
2
TL H 9294 – 31