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LMF40 High Performance 4th-Order Switched-Capacitor

Butterworth Low-Pass Filter

December 1994

LMF40 High Performance 4th-Order

Switched-Capacitor Butterworth Low-Pass Filter

General Description

The LMF40 is a versatile easy to use precision 4th-order

Butterworth low-pass filter fabricated using National鈥檚 high

performance LMCMOS process Switched-capacitor tech-

niques eliminate external component requirements and al-

low a clock-tunable cutoff frequency The ratio of the clock

frequency to the low-pass cutoff frequency is internally set

to 50-to-1 (LMF40-50) or 100-to-1 (LMF40-100) 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 con-

trol an external TTL or CMOS logic compatible clock can

be applied The maximally flat passband frequency re-

sponse together with a DC gain of 1 V V allows cascading

LMF40 sections together for higher-order filtering

Features

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Cutoff frequency range of 0 1 Hz to 40 kHz

Cutoff frequency accuracy of

g

1 0% maximum

Low offset voltage

g

100 mV maximum

g

5V supply

Low clock feedthrough of 5 mV

P-P

typical

Dynamic range of 88 dB typical

No external components required

8-pin mini-DIP or 14-pin wide-body small-outline pack-

ages

4V to 14V single dual supply operation

Cutoff frequency set by external or internal clock

Pin-compatible with MF4

Applications

Y

Y

Y

Communication systems

Instrumentation

Automated control systems

Block and Connection Diagrams

Dual-In-Line Package

TL H 10557 鈥?2

Top View

Small-Outline-Wide-Body Package

Pin numbers in parentheses are for the 14-pin package

TL H 10557 鈥?1

Ordering Information

Industrial (

b

40 C

s

T

A

s

a

85 C)

LMF40CIN-50 LMF40CIN-100

LMF40CIWM-50

LMF40CIWM-100

Military (

b

55 C

s

T

A

s

a

125 C)

LMF40CMJ-50 LMF40CMJ-100

J08A

Package

N08E

M14B

M14B

TL H 10557 鈥?3

Top View

TRI-STATE is a registered trademark of National Semiconductor Corporation

C

1995 National Semiconductor Corporation

TL H 10557

RRD-B30M115 Printed in U S A

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• LMF40
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  LMF40

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