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%. 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.
|Part number||Order||Vs (Min) (V)||Vs (Max) (V)||Operating temperature range (C)||Package Group||Package size: mm2:W x L (PKG)|
||12||36||-25 to 85||
PDIP | 14
SOIC | 16
14PDIP: 181 mm2: 9.4 x 19.3 (PDIP | 14)
16SOIC: 77 mm2: 7.5 x 10.3 (SOIC | 16)