Integrated Circuit - AS3320, Multi-Mode VCF, Alfa, 18-Pin Dip

Integrated Circuit - AS3320, Multi-Mode VCF, Alfa, 18-Pin Dip

Integrated Circuit - AS3320, Multi-Mode VCF, Alfa, 18-Pin Dip image 1
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The AS3320 is Alfa’s version of the CEM3320 IC. The AS3320 is a high performance voltage controlled four-pole filter with on-chip voltage controllable resonance IC. 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 minus two volt regulator to ensure low power dissipation and consequent low warm-up drift.

The AS3320 is available in an 18-pin DIP package.


  • 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
Item ID:
ALFA RPAR Part Number:
Product Measurements by Type
Amount of Resonance Obtainable Before Oscillation30 dB
Buffer Input Bias Current±30 nA
Buffer Output Impedance50 Ω
Buffer Sink Capability0.5 mA
Buffer Slew Rate3 V/µS
Distortion in Bandreject0.3%
Distortion in Passband0.1%
Distortion of Sine Wave Oscillation0.5%
Exponential Error of Pole Frequency Control Scale4%
Gain of Variable Gain Cell at VCFI=01
Gm of Resonance Control Element at ICR=100µA1 mmhos
Input Bias Current of Frequency Control Input1 µA
Input Impedance of Resonance Signal Input3.6 KΩ
Internal Reference Current63 µA
Max. Current through any pin±40 mA
Max. Operating Temperature Range- 25°C to 75°C
Max. Storage Temperature Range- 55°C to 150°C
Max. Voltage between Cell Input and GND pins+0.5 V, -6 V
Max. Voltage between Frequency Control and GND pins±6 V
Max. Voltage between Resonance Control and GND pins+2 V, -18 V
Max. Voltage between Vcc and GND pins+18 V, -0.5 V
Max. Voltage between Vcc and Vee pins+22 V, -0.5 V
Max. Voltage between Vee and GND pins-4 V, -0.5V
Max Gain of Variable Gain Cell3
Negative Supply Current8.5 mA
Negative Supply Range (Current limiting resistor always required)-4V to -18V
Output Impedance of Gain Cell1 MΩ
Output Noise re Max Output-86 dB
Output Swing At Clipping12 V.P.P.
Output voltage DC6.5 V
Pole Frequency Control Feedthrough60 mV
Pole Frequency Control Range10,000:1
Pole Frequency Warm-up Drift0.5%
Positive Supply Current5 mA
Positive Supply Range+9V to +18V
Rejection in Bandreject83 dB
Resonance Control Feedthrough0.2 V
Sensitivity of Pole Frequency Control Scale, Midrange60 mV/decade
Tempco of Pole Frequency Control Scale3300 ppm
Tempco of Variable Gain Cell500 ppm
Voltage at the negative supply pin-2.7 V
Packaging Information
Packaging Dimensions0.916 in. × 0.358 in. × 0.308 in.
Weight (Packaging)0.003 lbs.
PDF: DatasheetAll Models

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