The UAF42 is a universal active filter that can be

　　– Low-Pass, High-Pass configured for a wide range of low-pass, high-pass,

　　– Band-Pass, Band-Reject and band-pass filters. It uses a classic state-variable 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

　　– Includes On-Chip 1000pF ±0.5% Capacitors one of the most difficult problems of active filter

　　design—obtaining tight tolerance, low-loss capacitors.

　　A DOS-compatible filter design program allows easy

　　· TEST EQUIPMENT implementation of many filter types, such as

　　· COMMUNICATIONS EQUIPMENT Butterworth, Bessel, and Chebyshev. A fourth, · MEDICAL INSTRUMENTATION uncommitted FET-input op amp (identical to the other three) can be used to form additional stages, or for

　　· DATA ACQUISITION SYSTEMS special filters such as band-reject and Inverse

　　· MONOLITHIC REPLACEMENT FOR UAF41 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.