lmf60 National Semiconductor Corporation, lmf60 Datasheet

lmf60

Manufacturer Part Number

lmf60

Description

High Performance 6th-order Switched Capacitor Butterworth Lowpass Filter

Manufacturer

National Semiconductor Corporation

Datasheet

1.LMF60.pdf (20 pages)

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C 1996 National Semiconductor Corporation

LMF60 High Performance

6th-Order Switched Capacitor

Butterworth Lowpass Filter

General Description

The LMF60 is a high performance precision 6th-order But-

terworth lowpass active filter It is fabricated using Nation-

al’s LMCMOS process an improved silicon-gate CMOS pro-

cess specifically designed for analog products Switched-

capacitor techniques eliminate external component require-

ments and allow a clock-tunable cutoff frequency The ratio

of the clock frequency to the low-pass cutoff frequency is

internally set to 50 1 (LMF60-50) or 100 1 (LMF60-100) A

Schmitt trigger clock input stage allows two clocking op-

tions either self-clocking (via an external resistor and ca-

pacitor) for stand-alone applications or for tighter cutoff fre-

quency control a TTL or CMOS logic compatible clock can

be directly applied The maximally flat passband frequency

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

LMF60 sections 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 appli-

cations The LMF60 is pin- and functionally-compatible with

the MF6 but provides improved performance

Block and Connection Diagrams

TRI-STATE is a registered trademark of National Semiconductor Corporation

TL H 9294

Features

Applications

Cutoff frequency range of 0 1 Hz to 30 kHz

Cutoff frequency accuracy of

Low offset voltage

Low clock feedthrough of 10 mV

Dynamic range of 88 dB typical

Two uncommitted op amps available

No external components required

14-pin DIP or 14-pin wide-body S O package

Single Dual Supply Operation

Cutoff frequency set by external or internal clock

Pin-compatible with the MF6

Communication systems

Audio filtering

Anti-alias filtering

Data acquisition noise filtering

Instrumentation

High-order tracking filters

4V to

TL H 9294 – 1

RRD-B30M56 Printed in U S A

14V (

2V to

See NS Package Number M14B

See NS Package Number N14A

See NS Package Number J14A

Order Number LMF60CIWM-50

100 mV maximum

Order Number LMF60CMJ-50

Order Number LMF60CIN-50

or LMF60CMJ100 883)

(5962-9096 701MCA or

7V)

(5962-9096 702MCA

or LMF60CIWM-100

LMF60CMJ50 883)

LMF60CMJ-100 or

or LMF60CIN-100

All Packages

1 0% maximum

Top View

p – p

typical

5V supply

TL H 9294 – 2

May 1996

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