ALFA RPAR AS3320-SMT Voltage Controlled Filter (VCF) (SOIC-18)

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The ALFA RPAR AS3320 is a high performance voltage controlled four-pole filter with on-chip voltage controllable resonance IC. It is pin-for-pin compatible with the CEM3320.

The four independent sections may be interconnected to provide a wide variety of filter responses such as low pass, high pass, band pass and all pass. A single input exponentially controls the frequency over greater than a ten octave range with little control voltage feedthrough.

Another input controls the resonance in a modified linear manner from zero to low distortion oscillation. For those demanding applications, provision has been made to allow trimming for improved control voltage rejection.

Each filter section features a variable gain cell which is fully temperature compensated, exhibits a better signal-to-noise ratio and generates its low distortion predominantly in the second harmonic. The device includes a -2V regulator to ensure low power dissipation and consequent low warm-up drift.

Features

• Improved CEM3320 replacement
• Voltage controllable frequency - 12 octave range
• Voltage controllable resonance - from zero to oscillation
• Accurate exponential frequency scale
• Accurate linear resonance scale
• Low control voltage feedthrough -45dB typical
• filter configurable into LPF, HPF, all pass, etc.
• Low noise: -86dB typical
• Low distortion in passband - 0.1% typical
• Low warm up drift
• Configurable into low distortion voltage controlled sine wave oscillator
• Bandwidth till 800kHz

Product Replacements

This device is compatible with original chips used in the following products. Note however that this device is a surface mount package and cannot be used as a direct replacement. See the DIL version of this device for a direct replacement. ^*

References