Product Summary

The UAF42 is a universal active filter that can beconfigured for a wide range of low-pass, high-pass,and band-pass filters. It uses a classic state-variableanalog architecture with an inverting amplifier and twointegrators. The integrators include on-chip 1000pF capacitors trimmed to 0.5%. This architecture solves one of the most difficult problems of active filter design—obtaining tight tolerance, low-loss capacitors. A DOS-compatible filter design program allows easy implementation of many filter types, such as Butterworth, Bessel, and Chebyshev. A fourth, uncommitted FET-input op amp (identical to the other three) can be used to form additional stages, or for special filters such as band-reject and Inverse Chebyshev. 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.

Parametrics

Filter Type Universal Frequency - Cutoff Or Center 100kHz
Number Of Filters 3 Max-order 6th
Voltage - Supply 6 V ~ 18 V Mounting Type Surface Mount
Package / Case 16-SOIC (0.300", 7.5mm Width) Lead Free Status / RoHS Status Lead free / RoHS Compliant

Features

FEATURES1

?VERSATILE:2– Low-Pass, High-Pass– Band-Pass, Band-Reject

?SIMPLE DESIGN PROCEDURE

?ACCURATE FREQUENCY AND Q:– Includes On-Chip 1000pF ±0.5% Capacitors

Diagrams

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
UAF42AU-1
UAF42AU-1

Texas Instruments

IC UNIV ACTIVE FILTER 16-SOIC

Data Sheet

Negotiable 
UAF42AUE4
UAF42AUE4

Texas Instruments

Active Filters Universal Active Filter

Data Sheet

0-1: $8.96
1-10: $8.15
10-25: $7.54
25-50: $7.28
UAF42AU
UAF42AU

Texas Instruments

Active Filters Universal Active Filter

Data Sheet

0-1: $8.96
1-10: $8.15
10-25: $7.54
25-50: $7.28