MF6CN-100 National Semiconductor, MF6CN-100 Datasheet - Page 18

• Manufacturer Part Number: MF6CN-100
• Description: FILTER ORDER SW CAP LOWPASS
• Manufacturer: National Semiconductor

Specifications of MF6CN-100

• Filter Type: Butterworth, Lowpass Switched Capacitor
• Frequency - Cutoff Or Center: 20kHz
• Number Of Filters: 1
• Max-order: 6th
• Voltage - Supply: 5 V ~ 14 V
• Mounting Type: *
• Package / Case: *
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *MF6CN-100

Designing with the MF6
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 f
1
R
C
1
4
1
R
f
1
e
0
R
0
1
1 0
R
1
R
3
1
R
1
2
(H
2
)
C
2
1
0
C
C
1
e
2
1 when R
(Continued)
3
e
and R
0 707
4
(if used) R
4
are omitted and V
1
and R
18
2
O2
should be
is directly tied to INV2)
t
10 k
in order not to load Op-Amp
2
2
TL H 5065 – 34