Product details

Vs (Min) (V) 12 Vs (Max) (V) 36 Product type Active filter Operating temperature range (C) -25 to 85
Vs (Min) (V) 12 Vs (Max) (V) 36 Product type Active filter Operating temperature range (C) -25 to 85
PDIP (N) 14 181 mm² 19.3 x 9.4 SOIC (DW) 16 77 mm² 7.52 x 10.28
  • VERSATILE:
    • Low-Pass, High-Pass
    • Band-Pass, Band-Reject
  • SIMPLE DESIGN PROCEDURE
  • ACCURATE FREQUENCY AND Q:
    • Includes On-Chip 1000pF ±0.5% Capacitors
  • VERSATILE:
    • Low-Pass, High-Pass
    • Band-Pass, Band-Reject
  • SIMPLE DESIGN PROCEDURE
  • ACCURATE FREQUENCY AND Q:
    • Includes On-Chip 1000pF ±0.5% Capacitors

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.

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.

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Technical documentation

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Type Title Date
* Data sheet Universal Active Filter   datasheet (Rev. B) 24 Oct 2010
Application note Build a 3-Phase Sine Wave Generator with the UAF42 04 Oct 2000
Application note Design a 60Hz Notch Filter with the UAF42 04 Oct 2000
Application note Digitally Programmable, Time-Continuous Active Filter 27 Sep 2000
Application note Filter Design Program For The UAF42 Universal Active Filter 27 Sep 2000
Application note Simple Filter Turns Square Waves into Sine Waves 27 Sep 2000

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UAF42 PSpice Model (Rev. A)

SBFM007A.ZIP (18 KB) - PSpice Model
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PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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PDIP (N) 14 View options
SOIC (DW) 16 View options

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