MF5CWM National Semiconductor, MF5CWM Datasheet - Page 7

• 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
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
f
H
H
H
o
notch
OLP
OBP
ON
e
e
e
e
e
e
f
center frequency of the complex pole pair
center frequency of the imaginary zero pair
Lowpass gain (as f
Bandpass gain (at f
Notch output gain as f
100
f
CLK
notch
or
e
f
CLK
50
f
o
(See Figure 7 )
e
f
f
o
0)
)
e b
e b
0
f
CLK
R3
R1
R2
R1
2
e
b
R
R
1
FIGURE 8 MODE 1a
FIGURE 7 MODE 1
e
2
f
o
7
Q
BW
Circuit dynamics
MODE 1a Non-Inverting BP LP (See Figure 8 )
f
Q
H
H
H
Circuit dynamics H
Note V
o
OLP
OBP 1
OBP 2
e
e
IN
e
e
e b
e b
e
H
H
BW
the
f
should be driven from a low impedance (
OLP
OLP(peak)
o
f
R3
R2
1 (non-inverting)
100
CLK
b
1 H
R3
R2
e
e
3 dB bandwidth of the bandpass output
or
R3
R2
OLP(peak)
H
f
OBP
CLK
OBP 1
50
Q
j Q
or H
e
c
j Q
OBP
Q
H
OLP
e
TL H 5066 – 17
c
TL H 5066 – 16
(for high Q’s)
H
H
OLP c
OLP
(for high Q’s)
Q
e
H
ON c
k
1 k )
Q