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UAF42

High-Pass

Out

1000pF

(1)

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

FEATURES

DESCRIPTION

• 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.

blank

NOTE: (1) ±0.5%.

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.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (13 pages)

PAGE 1
UAF42 UA F4 2 UA F4 2 www.ti.com SBFS002B – JULY 1992 – REVISED OCTOBER 2010 UNIVERSAL ACTIVE FILTER Check for Samples: UAF42 FEATURES DESCRIPTION • The UAF42 is a universal active filter that can be configured for a wide range of low-pass, high-pass, and band-pass filters. It uses a classic state-variable analog architecture with an inverting amplifier and two integrators. The integrators include on-chip 1000pF capacitors trimmed to 0.5%.
PAGE 2
UAF42 SBFS002B – JULY 1992 – REVISED OCTOBER 2010 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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UAF42 www.ti.com SBFS002B – JULY 1992 – REVISED OCTOBER 2010 ELECTRICAL CHARACTERISTICS At TA = +25°C, and VS = ±15V, unless otherwise noted. UAF42AP, AU PARAMETER CONDITIONS MIN TYP MAX UNIT FILTER PERFORMANCE Frequency Range, fn Frequency Accuracy 0 to 100 f = 1kHz kHz 1 vs Temperature 0.01 % %/°C Maximum Q 400 — Maximum (Q • Frequency) Product 500 kHz 0.01 %/°C (fO • Q) < 10 0.
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UAF42 SBFS002B – JULY 1992 – REVISED OCTOBER 2010 www.ti.com ELECTRICAL CHARACTERISTICS (continued) At TA = +25°C, and VS = ±15V, unless otherwise noted.
PAGE 5
UAF42 www.ti.com SBFS002B – JULY 1992 – REVISED OCTOBER 2010 APPLICATION INFORMATION The UAF42 is a monolithic implementation of the proven state-variable analog filter topology. This device is pin-compatible with the popular UAF41 analog filter, and it provides several improvements. The slew rate of the UAF42 has been increased to 10V/ms, versus 1.6V/ms for the UAF41. Frequency • Q product of the UAF42 has been improved, and the useful natural frequency extended by a factor of four to 100kHz.
PAGE 6
UAF42 SBFS002B – JULY 1992 – REVISED OCTOBER 2010 www.ti.com HP Out BP Out RF1 12 13 LP Out RF2 8 7 1 14 R1 50kW R2 50kW 2 C1 C2 1000pF 1000pF 50kW RG VIN A1 3 A2 A3 R4 50kW RQ UAF42 11 Note: If RG = 50kW, the external gain-setting resistor can be eliminated by connecting VIN to pin 2. Pin numbers are for DIP package. SOIC-16 pinout is different. Design Equations 1. 2 wn = 1+ R2 4. R1 RF1 RF2 C1 C2 ALP = RG 1+ 2.
PAGE 7
UAF42 www.ti.com SBFS002B – JULY 1992 – REVISED OCTOBER 2010 HP Out BP Out RF1 RG LP Out RF2 VIN 13 12 8 7 14 1 R1 50kW R2 50kW 2 C1 C2 1000pF 1000pF 50kW A1 3 A2 A3 R4 50kW RQ 11 Note: If RQ = 50kW, the external Q-setting resistor can be eliminated by connecting pin 2 to ground. Pin numbers are for DIP package. SOIC-16 pinout is different. Design Equations 1. R2 2 wn = R1 RF1 RF2 C1 C2 R1 4. ALP = 5. AHP = 6. ABP = 1 + RG 1/2 2.
PAGE 8
UAF42 SBFS002B – JULY 1992 – REVISED OCTOBER 2010 www.ti.com REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision A (November, 2007) to Revision B • 8 Page Corrected package marking information shown in Ordering Information table ....................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.