MF4CN-100 National Semiconductor, MF4CN-100 Datasheet

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MF4CN-100

Manufacturer Part Number
MF4CN-100
Description
IC LOWPASS FILTER 4TH ORD SW CAP
Manufacturer
National Semiconductor
Datasheet

Specifications of MF4CN-100

Filter Type
Butterworth, Lowpass Switched Capacitor
Frequency - Cutoff Or Center
20kHz
Number Of Filters
1
Max-order
4th
Voltage - Supply
5 V ~ 14 V
Mounting Type
*
Package / Case
*
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*MF4CN-100

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MF4CN-100
Manufacturer:
NSC
Quantity:
7 910
Part Number:
MF4CN-100
Manufacturer:
NS/国半
Quantity:
20 000
Company:
Part Number:
MF4CN-100
Quantity:
24
C 1995 National Semiconductor Corporation
MF4 4th Order Switched Capacitor Butterworth
Lowpass Filter
General Description
The MF4 is a versatile easy to use precision 4th order
Butterworth low-pass filter Switched-capacitor techniques
eliminate external component requirements and allow a
clock-tunable cutoff frequency The ratio of the clock fre-
quency to the low-pass cutoff frequency is internally set to
50 to 1 (MF4-50) or 100 to 1 (MF4-100) A Schmitt trigger
clock input stage allows two clocking options either self-
clocking (via an external resistor and capacitor) for stand-
alone applications or for tighter cutoff frequency control an
external TTL or CMOS logic compatible clock can be ap-
plied The maximally flat passband frequency response to-
gether with a DC gain of 1 V V allows cascading MF4 sec-
tions together for higher order filtering
Block and Connection Diagrams
TRI-STATE is a registered trademark of National Semiconductor Corp
TL H 5064
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Low Cost
Easy to use
8-pin mini-DIP or 14-pin wide-body S O
No external components
5V to 14V supply voltage
Cutoff frequency range of 0 1 Hz to 20 kHz
Cutoff frequency accuracy of
Cutoff frequency set by external clock
Separate TTL and CMOS Schmitt-trigger clock inputs
TL H 5064 – 1
See NS Package Number M14B
Order Number MF4CWM-50
See NS Package Number N08E
Wide-Body Package
Order Number MF4CN-50
Dual-In-Line Package
or MF4CWM-100
Small-Outline
g
or MF4CN-100
Top View
0 3% typical
RRD-B30M115 Printed in U S A
December 1994
TL H 5064– 25
TL H 5064 – 2

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MF4CN-100 Summary of contents

Page 1

... Y g Cutoff frequency set by external clock Y Separate TTL and CMOS Schmitt-trigger clock inputs Y Dual-In-Line Package Order Number MF4CN-50 or MF4CN-100 See NS Package Number N08E Small-Outline Wide-Body Package TL H 5064 – 1 Top View Order Number MF4CWM-50 or MF4CWM-100 See NS Package Number M14B ...

Page 2

... See AN-450 ‘‘Surface Mounting Methods and Their Effect 14V on Product Reliability’’ for other methods of soldering sur face mount devices Operating Ratings Temperature Range MF4CN-50 MF4CN-100 500 mW MF4CWM-50 MF4CWM-100 150 C Supply Voltage (V a 800 V The following specifications apply for all other limits MIN MAX A MF4-50 ...

Page 3

Filter Electrical Characteristics otherwise specified Boldface limits apply for T Parameter Conditions Cutoff Frequency min c Range (Note 3) max Supply Current f 250 kHz e clk ...

Page 4

Logic Input-Output Characteristics otherwise specified Boldface limits apply for T Parameter SCHMITT TRIGGER (Continued) V Negative Going Threshold Min b T Voltage Max Min Max Hysteresis (V –V ) Min Max Min Max Minimum Logical ‘‘1’’ ...

Page 5

Typical Performance Characteristics Power Supply Current vs Power Supply Voltage Positive Voltage Swing vs Power Supply Voltage Negative Voltage Swing vs Temperature f f Deviation CLK c vs Clock Frequency Power Supply Current Power Supply Current vs Clock Frequency vs ...

Page 6

Typical Performance Characteristics f f Deviation CLK c vs Temperature DC Gain Deviation vs Temperature (Continued) DC Gain Deviation DC Gain Deviation vs Power Supply Voltage vs Power Supply Voltage DC Gain Deviation vs Temperature 5064 – ...

Page 7

Pin Descriptions (Numbers are for 14-pin package ) Pin Pin Function Name 1 CLK IN A CMOS Schmitt-trigger input to be used (1) with an external CMOS logic level clock Also used for self clocking Schmitt-trigger oscillator ...

Page 8

MF4 Application Hints (Continued) (where T equals one clock period CLK T The equivalent input resistor (R ) then can be expressed as in ...

Page 9

Designing With The MF4 slope per octave Because the MF4 is a Butter- worth filter and therefore has no ripple in its passband when MF4s are cascaded the resulting filter also has no ripple in ...

Page 10

(a) FIGURE 2 Split Supply Operation with CMOS Level Clock (a) and TTL Level Clock (b) FIGURE 3 ...

Page 11

FIGURE 5a MF4-100 Amplitude Response with 5V Supplies g FIGURE 6 Design Example Magnitude Response Specification where the Response of the Filter Design must fall within the shaded area of the specification FIGURE 5b MF4-50 Amplitude Response with 5V Supplies ...

Page 12

FIGURE 7 Cascading Two MF4s FIGURE 8a One MF4-50 vs Two MF4-50s Cascaded FIGURE 9 MF4-50 Abrupt Clock Frequency Change FIGURE 8b Phase Response of Two Cascaded MF4-50s TL H 5064 – 24 FIGURE 10 MF4-50 Input Step Response 12 ...

Page 13

FIGURE 11 The phenomenon of aliasing in sampled-data systems An input signal whose frequency is greater than one-half the sampling frequency will cause an output to appear at a frequency lower than one-half the sampling frequency ...

Page 14

... Physical Dimensions inches (millimeters) (Continued) Order Number MF4CN-50 or MF4CN-100 LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or ...

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