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MF6 6th Order Switched Capacitor Butterworth Lowpass Filter
December 1994
MF6 6th Order Switched Capacitor
Butterworth Lowpass Filter
General Description
The MF6 is a versatile easy to use, precision 6th order But-
terworth lowpass active filter. Switched capacitor tech-
niques eliminate external component requirements and al-
low a clock tunable cutoff frequency. The ratio of the clock
frequency to the lowpass cutoff frequency is internally set to
50 to 1 (MF6-50) or 100 to 1 (MF6-100). A Schmitt trigger
clock input stage allows two clocking options, either self-
clocking (via an external resistor and capacitor) for stand-
alone applications, or an external TTL or CMOS logic com-
patible clock can be used for tighter cutoff frequency con-
trol. The maximally flat passband frequency response to-
gether with a DC gain of 1 V/V allows cascading MF6 sec-
tions for higher order filtering. In addition to the filter, two
independent CMOS op amps are included on the die and
are useful for any general signal conditioning applications.
Features
Y
No external components
Y
14-pin DIP or 14-pin wide-body S.O. package
Y
Cutoff frequency accuracy of
g
0.3% typical
Y
Cutoff frequency range of 0.1 Hz to 20 kHz
Y
Two uncommitted op amps available
Y
5V to 14V total supply voltage
Y
Cutoff frequency set by external or internal clock
Block and Connection Diagrams
All Packages
TL/H/5065±2
TL/H/5065±1
Top View
Order Number MF6CWM-50
or MF6CWM-100
See NS Package Number M14B
Order Number MF6CN-50
or MF6CN-100
See NS Package Number N14A
Order Number MF6CJ-50
or MF6CJ-100
See NS Package Number J14A
TRI-STATE
É
is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
TL/H/5065
RRD-B30M75/Printed in U. S. A.
Absolute Maximum Ratings
(Note 11)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage
See AN-450 ``Surface Mounting Methods and Their Effect
on Product Reliability'' (Appendix D) for other methods of
soldering surface mount devices.
14V
Operating Ratings
(Note 11)
Temperature Range
Voltage at Any Pin
V
b
b
0.2V, V
a
a
0.2V
Input Current at Any Pin (Note 13)
5 mA
T
MIN
s
T
A
s
T
MAX
MF6CN-50, MF6CN-100
0
§
C
s
T
A
s a
70
§
C
Package Input Current (Note 13)
20 mA
Power Dissipation (Note 14)
500 mW
MF6CWM-50, MF6CWM-100
0
§
C
s
T
A
s a
70
§
C
Storage Temperature
b
65
§
Cto
a
150
§
C
MF6CJ-50, MF6CJ-100
b
40
§
C
s
T
A
s a
85
§
C
Supply Voltage (V
S
e
V
a
b
V
b
)
ESD Susceptibility (Note 12)
800V
5Vto14V
Soldering Information
N Package (10 sec.)
260
§
C
J Package (10 sec.)
300
§
C
SO Package
Vapor Phase (60 sec.)
215
§
C
Infrared (15 sec.)
220
§
C
Filter Electrical Characteristics
The following specifications apply for f
CLK
s
250 kHz (see Note 3) unless
otherwise specified. Boldface limits apply for T
MIN
to T
MAX
; all other limits T
A
e
T
J
e
25
§
C.
MF6CWM-50, MF6CWM-100,
MF6CJ-50, MF6CJ-100
MF6CN-50, MF6CN-100
Parameter
Conditions
Tested Design
Tested Design
Units
Typical
Typical
Limit
Limit
Limit
Limit
(Note 8)
(Note 8)
(Note 9)
(Note 10)
(Note 9)
(Note 10)
V
a
ea
5V, V
b
eb
5V
f
c
, Cutoff MF6-50 Min
0.1
0.1
Frequency
Max
20k
20k
Hz
Range MF6-100 Min
0.1
0.1
(Note 1)
Max
10k
10k
Total Supply Current
f
CLK
e
250 kHz 4.0
6.0
8.5
4.0
8.5
mA
Maximum Clock Filter Output
30
30
mV
Feedthrough Op Amp 1 Out
25
25
(peak-to-
Op Amp 2 Out
20
20
peak)
H
o
,
R
source
0.0
g
0.30
g
0.30
0.0
g
0.30
dB
DC Gain
s
2k
X
f
CLK
/f
c
,
MF6-50
49.27
g
0.3% 49.27
g
1% 49.27
g
1% 49.27
g
0.3% 49.27
g
1%
Clock to Cutoff MF6-100
98.97
g
0.3% 98.97
g
1% 98.97
g
1% 98.97
g
0.3% 98.97
g
1%
Frequency Ratio
DC
MF6-50
b
200
b
200
mV
Offset Voltage
MF6-100
b
400
b
400
Minimum Output
R
L
e
10 k
X
a
4.0
a
3.5
a
3.5
a
4.0
a
3.5
V
Voltage Swing
b
4.1
b
3.8
b
3.5
b
4.1
b
3.5
Maximum Output
Source
50
50
Short Circuit
mA
Sink
1.5
1.5
Current (Note 6)
Dynamic Range
MF6-50
83
83
dB
(Note 2)
MF6-100
81
81
Additional
MF6-50 f
CLK
e
250 kHz
Magnitude
f
e
6000 Hz
b
9.47
b
9.47
g
0.6
b
9.47
g
0.75
b
9.47
b
9.47
g
0.75
dB
Response Test
f
e
4500 Hz
b
0.92
b
0.92
g
0.6
b
0.92
g
0.4
b
0.92
b
0.92
g
0.4
Points (Note 4)
MF6-100 f
CLK
e
250 kHz
f
e
3000 Hz
b
9.48
b
9.48
g
0.3
b
9.48
g
0.75
b
9.48
b
9.48
g
0.75
dB
f
e
2250 Hz
b
0.97
b
0.97
g
0.3
b
0.97
g
0.4
b
0.97
b
0.97
g
0.4
2
Filter Electrical Characteristics
(Continued) The following specifications apply for f
CLK
s
250 kHz (see
Note 3) unless otherwise specified. Boldface limits apply for T
MIN
to T
MAX
; all other limits T
A
e
T
J
e
25
§
C.
MF6CWM-50, MF6CWM-100
MF6CJ-50, MF6CJ-100
MF6CN-50, MF6CN-100
Parameter
Conditions
Tested Design
Tested Design
Units
Typical
Typical
Limit
Limit
Limit
Limit
(Note 8)
(Note 8)
(Note 9)
(Note 10)
(Note 9)
(Note 10)
V
a
ea
5V, V
b
eb
5V
(Continued)
Attenuation Rate MF6-50 f
CLK
e
250 kHz
dB/
f
1
e
6000 Hz
b
36
b
36
b
36
octave
f
2
e
8000 Hz
MF6-100 f
CLK
e
250 kHz
dB/
f
1
e
3000 Hz
b
36
b
36
b
36
octave
f
2
e
4000 Hz
V
a
ea
2.5V, V
b
eb
2.5V
f
c
, Cutoff MF6-50 Min
0.1
0.1
Frequency
Max
10k
10k
Hz
Range MF6-100 Min
0.1
0.1
(Note 1)
Max
5k
5k
Total Supply Current
f
CLK
e
250 kHz 2.5
4.0
4.0
2.5
4.0
mA
Maximum Clock Filter Output
20
20
mV
Feedthrough Op Amp 1 Out
15
15
(peak-to-
Op Amp 2 Out
10
10
peak)
H
o
, DC Gain
R
source
s
2k
X
0.0
g
0.30
g
0.30
0.0
g
0.30
dB
f
CLK
/f
c
, Clock to
Cutoff Frequency MF6-50
49.10
g
0.3% 49.10
g
2% 49.10
g
3% 49.10
g
0.3% 49.10
g
3%
Ratio
MF6-100
98.65
g
0.3% 98.65
g
2% 98.65
g
2.25% 98.65
g
0.3% 98.65
g
2.25%
DC
MF6-50
b
200
b
200
mV
Offset Voltage MF6-100
b
400
b
400
Minimum Output
R
L
e
10 k
X a
1.5
a
1.0
a
1.0
a
1.5
a
1.0
V
Voltage Swing
b
2.2
b
1.7
b
1.5
b
2.2
b
1.5
Maximum Output
Source
28
28
Short Circuit
mA
Sink
0.5
0.5
Current (Note 6)
Dynamic Range (Note 2)
77
77
dB
Additional
MF6-50 f
CLK
e
250 kHz
Magnitude
f
e
6000 Hz
b
9.54
b
9.54
g
0.6
b
9.54
g
0.75
b
9.54
b
9.54
g
0.75
dB
Response Test
f
e
4500 Hz
b
0.96
b
0.96
g
0.3
b
0.96
g
0.4
b
0.96
b
0.96
g
0.4
Points (Note 4)
MF6-100 f
CLK
e
250 kHz
f
e
3000 Hz
b
9.67
b
9.67
g
0.6
b
9.67
g
0.75
b
9.67
b
9.67
g
0.75
dB
f
e
2250 Hz
b
1.01
b
1.01
g
0.3
b
1.01
g
0.4
b
1.01
b
1.01
g
0.4
Attenuation
MF6-50 f
CLK
e
250 kHz
dB/
Rate
f
1
e
6000 Hz
b
36
b
36
b
36
octave
f
2
e
8000 Hz
MF6-100 f
CLK
e
250 kHz
dB/
f
1
e
3000 Hz
b
36
b
36
b
36
octave
f
2
e
4000 Hz
3
Op Amp Electrical Characteristics
Boldface limits apply for T
MIN
to T
MAX
; all other limits T
A
e
T
J
e
25
§
C.
MF6CN-50, MF6CN-100,
MF6CJ-50, MF6CJ-100
MF6CWM-50, MF6CWM-100
Parameter
Conditions
Tested Design
Tested Design
Units
Typical
Typical
Limit
Limit
Limit
Limit
(Note 8)
(Note 8)
(Note 9) (Note 10)
(Note 9) (Note 10)
V
a
ea
5V, V
b
eb
5V
Input Offset Voltage
g
8.0
g
20
g
20
g
8.0
g
20
mV
Input Bias Current
10
10
pA
CMRR (Op Amp
Ý
2 Only)
V
CM1
e
1.8V,
60
55
60
55
dB
V
CM2
eb
2.2V
Output Voltage Swing
R
L
e
10 k
X
a
4.0
a
3.8
a
3.6
a
4.0
a
3.6
V
b
4.5
b
4.0
b
4.0
b
4.5
b
4.0
Maximum Output Short Source
54
65
80
54
80
mA
Circuit Current (Note 6) Sink
2.0
4.0
6.0
2.0 6.0
Slew Rate
7.0
7.0
V/
m
s
DC Open Loop Gain
72
72
dB
Gain Bandwidth Product
1.2
1.2
MHz
V
a
ea
2.5V, V
b
eb
2.5V
Input Offset Voltage
g
8.0
g
20
g
20
g
8.0
g
20
mV
Input Bias Current
10
10
pA
CMRR (Op-Amp
Ý
2 Only)
V
CM1
ea
0.5V,
60
55
60
55
dB
V
CM2
eb
0.9V
Output Voltage Swing
R
L
e
10 k
X
a
1.5
a
1.3
a
1.1
a
1.5
a
1.1
V
b
2.2
b
1.7
b
1.7
b
2.2
b
1.7
Maximum Output Short Source
24
24
mA
Circuit Current (Note 6) Sink
1.0
1.0
Slew Rate
6.0
6.0
V/
m
s
DC Open Loop Gain
67
67
dB
Gain Bandwidth Product
1.2
1.2
MHz
4
Logic Input-Output Electrical Characteristics
The following specifications apply for V
b
e
0V
(see Note 5) unless otherwise specified. Boldface limits apply for T
MIN
to T
MAX
; all other limits T
A
e
T
J
e
25
§
C.
MF6CN-50, MF6CN-100
MF6CJ-50, MF6CJ-100
MF6CWM-50, MF6CWM-100
Parameter
Conditions
Typical
Tested Design
Typical
Tested Design
Units
Limit Limit
Limit Limit
(Note 8)
(Note 8)
(Note 9) (Note 10)
(Note 9) (Note 10)
TTL CLOCK INPUT, CLK R PIN (Note 7)
Maximum V
IL
, Logical ``0''
0.8 0.8
0.8
V
Input Voltage
Maximum Leakage Current
2.0 2.0
2.0
V
L Sh Pin at
2.0 2.0
2.0
m
A
at CLK R Pin
Mid- Supply
SCHMITT TRIGGER
V
T
a
, Positive Going Min V
a
e
10V
7.0
6.1 6.1 7.0 6.1
V
Threshold Voltage Max
8.9 8.9
8.9
Min V
a
e
5V
3.5
3.1 3.1 3.5 3.1
V
Max
4.4 4.4
4.4
V
T
b
, Negative Going Min V
a
e
10V
3.0
1.3 1.3 3.0 1.3
V
Threshold Voltage Max
3.8 3.8
3.8
Min V
a
e
5V
1.5
0.6 0.6 1.5 0.6
V
Max
1.9 1.9
1.9
Hysteresis (V
T
a
b
V
T
b
) Min V
a
e
10V
4.0
2.3 2.3 4.0 2.3
V
Max
7.6 7.6
7.6
Min V
a
e
5V
2.0
1.2 1.2 2.0 1.2
V
Max
3.8 3.8
3.8
Minimum Logical ``1'' Output
I
o
eb
10
m
A
V
a
e
10V
9.0 9.0
9.0
V
Voltage (Pin 11)
V
a
e
5V
4.5 4.5
4.5
Maximum Logical ``0'' Output
I
o
e
10
m
A
V
a
e
10V
1.0 1.0
1.0
V
Voltage (Pin 11)
V
a
e
5V
0.5 0.5
0.5
Minimum Output Source
CLK R Tied V
a
e
10V 6.0
3.0 3.0 6.0 3.0
mA
Current (Pin 11)
to Ground V
a
e
5V 1.5
0.75 0.75 1.5 0.75
Maximum Output Sink
CLK R Tied V
a
e
10V 5.0
2.5 2.5 5.0 2.5
mA
Current (Pin 11) to V
a
V
a
e
5V 1.3 0.65 0.65 1.3 0.65
Note 1: The cutoff frequency of the filter is defined as the frequency where the magnitude response is 3.01 dB less than the DC gain of the filter.
Note 2: For
g
5V supplies the dynamic range is referenced to 2.82 Vrms (4V peak) where the wideband noise over a 20 kHz bandwidth is typically 200
m
Vrms for
the MF6-50 and 250
m
Vrms for the MF6-100. For
g
2.5V supplies the dynamic range is referenced to 1.06 Vrms (1.5V peak) where the wideband noise over a 20
kHz bandwidth is typically 140
m
Vrms for both the MF6-50 and the MF6-100.
Note 3: The specifications for the MF6 have been given for a clock frequency (f
CLK
) of 250 kHz and less. Above this clock frequency the cutoff frequency begins to
deviate from the specified error band of
g
1.0% but the filter still maintains its magnitude characteristics. See Application Hints, Section 1.5.
Note 4: Besides checking the cutoff frequency (f
c
) and the stopband attenuation at 2 f
c
, two additional frequencies are used to check the magnitude response of
the filter. The magnitudes are referenced to a DC gain of 0.0 dB.
Note 5: For simplicity all the logic levels have been referenced to V
b
e
0V and will scale accordingly for
g
5V and
g
2.5V supplies (except for the TTL input logic
levels).
Note 6: The short circuit source current is measured by forcing the output that is being tested to its maximum positive voltage swing and then shorting that output to
the negative supply. The short circuit sink current is measured by forcing the output that is being tested to its maximum negative voltage swing and then shorting
that output to the positive supply. These are the worst-case conditions.
Note 7: The MF6 is operating with symmetrical split supplies and L.Sh is tied to ground.
Note 8: Typicals are at 25
§
C and represent most likely parametric norm.
Note 9: Tested limits are guaranteed to National's AOQL (Average Outgoing Quality Level.
Note 10: Design limits are guaranteed, but not 100% tested. These limits are not used to calculate outgoing quality levels.
Note 11: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when
operating the device beyond its specified conditions.
Note 12: Human body model, 100 pF discharged through a 1.5k
X
resistor.
Note 13: When the input voltage (V
IN
) at any pin exceeds the power supply rails (V
IN
k
V
b
or V
IN
l
V
a
) the absolute value of current at that pin should be limited
to 5 mA or less. The 20 mA package input current limits the number of pins that can exceed the power supply boundaries witha5mAcurrent limit to four.
Note 14: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
JMAX
,
i
JA
, and the ambient temperature, T
A
. The
maximum allowable power dissipation at any temperature is P
D
e
(T
JMAX
b
T
A
)/
i
JA
or the number given in the Absolute Maximum Ratings, whichever is lower.
For this device, T
JMAX
e
125
§
C, and the typical junction-to-ambient thermal resistance of the MF6CN when board mounted is 67
§
C/W. For the MF6CJ this number
decreases to 62
§
C/W. For MF6CWM,
i
JA
e
78
§
C/W.
5
Input Voltage
Minimum V
IH
, Logical ``1''
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