MF5CWM National Semiconductor, MF5CWM Datasheet - Page 8

• Manufacturer Part Number: MF5CWM
• Description: IC FILTER MONO SW CAP SO14
• Manufacturer: National Semiconductor

Specifications of MF5CWM

• Filter Type: Universal Switched Capacitor
• Frequency - Cutoff Or Center: 30kHz
• Number Of Filters: 1
• Max-order: 2nd
• Voltage - Supply: 8 V ~ 14 V
• Mounting Type: *
• Package / Case: *
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *MF5CWM

2 0 Modes of Operation
MODE 2 Notch 2 Bandpass Lowpass f
f
f
Q
H
H
H
H
Filter dynamics H
o
notch
OLP
OBP
ON 1
ON 2
e
e
e
e
e
e
e b
e
e
e b
e
(See Figure 9 )
center frequency
f
f
quality factor of the complex pole pair
Lowpass output gain (as f
Bandpass output gain (at f
Notch output gain (as f
Notch output gain
100
100
CLK
CLK
R2 R4
R2 R3
R2 R4
R2 R4
or
R2 R1
R2 R1
R2
R4
f
CLK
OBP
50
a
a
a
a
1
e
1
1
1 or
Q H
f
CLK
50
OLP
as f
H
R2
R4
ON 2
e
a
0)
f
(Continued)
CLK
f
e
2
o
1
0)
)
notch k
Q H
e b
e b
ON 1
R3 R1
f
R2 R1
o
H
FIGURE 9 MODE 2
ON 2
FIGURE 10 MODE 3
8
MODE 3 Highpass Bandpass Lowpass Outputs
f
Q
H
H
H
Circuit dynamics
H
H
o
OHP
OBP
OLP
OLP(peak)
OHP(peak)
e
e
e
e
e
e
TL H 5066– 19
(See Figure 10 )
f
quality factor of the complex pole pair
Highpass gain
Bandpass gain (at f
Lowpass gain (as f
100
CLK
j Q
j Q
R2
R4
c
c
R2
R4
c
c
R3
R2
R2
R4
H
H
e
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
OLP
In Mode 3 the feedback loop is closed around
OHP
or
H
H
OHP
OLP
f
(for high Q’s)
CLK
as f
50
(for high Q’s)
e
TL H 5066 – 18
H
c
OBP
f
o
0)
)
f
R2
R4
CLK
e b
e
2
e b
H
OHP c
e b
R3
R1
R4
R1
R2
R1
H
OLP c
Q