uaf42 ?

[Colin Fraser]

>I spotted the chip described below in the new Maplin catalogue, and pulled
>down the datasheet from BB's website.
>Has anyone used these ? Would they be useful in e-music applications ?
>The ics are 14ukp and the dos program is 5ukp...
>
>Cf
>
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>
>UAF42
>Universal Active Filter
>
>FEATURES 
>
>*VERSATILE-Low-pass, High-pass, Band-pass, Band-Reject *SIMPLE DESIGN
>PROCEDURE *ACCURATE FREQUENCY AND Q - INCLUDES ON CHIP 1000pF ±0.5%
>Capacitors 
>
>APPLICATIONS 
>
>*TEST EQUIPMENT *COMMUNICATIONS EQUIPMENT *MEDICAL INSTRUMENTATION *DATA
>ACQUISITION SYSTEMS *MONOLITHIC REPLACEMENT FOR UAF41 
>
>DESCRIPTION
>The UAF42 is a universal active filter which can be configured for a wide
>range of low-pass, high-pass, and band-pass filters. It uses a classical
>state-variable analog architecture with an inverting amplifier and two
>integrators. The integrators include on-chip 1000pF capacitors trimmed to
>0.5%. This 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 ceramic packages, and SOL-16
>surface-mount packages, specified for the -25°C to +85°C temperature range.
>
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