UAF42

UAF42

High-Pass

Out

R

R

R

1000pF

(1)

In

2

In

3

In

1

R

1000pF

(1)

Band-Pass

Out

Low-Pass

Out

GND

V+

V-

R=50kW 0.5%

±

UAF42

www.ti.com

SBFS002B – JULY 1992 – REVISED OCTOBER 2010

UNIVERSAL ACTIVE FILTER

Check for Samples: UAF42

1

FEATURES

DESCRIPTION

2

•

VERSATILE:

The UAF42 is a universal active filter that can be

configured for a wide range of low-pass, high-pass,

–

Low-Pass, High-Pass

and band-pass filters. It uses a classic state-variable

–

Band-Pass, Band-Reject

analog architecture with an inverting amplifier and two

•

SIMPLE DESIGN PROCEDURE

integrators. The integrators include on-chip 1000pF

•

ACCURATE FREQUENCY AND Q:

capacitors trimmed to 0.5%. This architecture solves

one of the most difficult problems of active filter

–

Includes On-Chip 1000pF ±0.5% Capacitors

design—obtaining tight tolerance, low-loss capacitors.

APPLICATIONS

A DOS-compatible filter design program allows easy

implementation

of

many

filter

types,

such

as

•

TEST EQUIPMENT

Butterworth,

Bessel,

and

Chebyshev.

A

fourth,

•

COMMUNICATIONS EQUIPMENT

uncommitted FET-input op amp (identical to the other

•

MEDICAL INSTRUMENTATION

three) can be used to form additional stages, or for

•

DATA ACQUISITION SYSTEMS

special filters such as band-reject and Inverse

Chebyshev.

•

MONOLITHIC REPLACEMENT FOR UAF41

The classical topology of the UAF42 forms a

time-continuous filter, free from the anomalies and

switching noise associated with switched-capacitor

filter types.

The UAF42 is available in 14-pin plastic DIP and

SOIC-16 surface-mount packages, specified for the

–25°C to +85°C temperature range.

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NOTE: (1) ±0.5%.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 1992–2010, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.