The resistor programmable continuous audio active filter IC is a CMOS chip that can be configured for either a lowpass, bandpass, highpass, allpass or notch filter. Butterworth, Bessel, elliptic and Chebyshev filters can be implemented. The frequency range covers the audio spectrum to 20 kHz. There is a low power version with a frequency range to 5kHz. There is a power down pin to reduce current consumption when the filter is not in use. The 8 pin part is a single filter stage, the 16pin part offers a dual filter stage. Between 2 and 5 external resistors set the filter characteristics depending on the desired response. Q can be set from between 0.25 and 50. No clock signal is required.


  • Independent Q. frequency and gain adjustments
  • Low sensitivity to external resistor variation
  • Operates up to 20 kHz
  • Low Power Operation
  • Low Voltage Operation
  • On Chip Power Save Pin
  • Cascadeble for Higher Order Filtering


  • Spectrum Analyzers
  • General Purpose Systems
  • Portable Systems
  • Anti-Alias Filters
  • Reconstruction Filters
  • Telecommunications
  • Tracking Filters
  • Harmonic Analysis
  • Noise Analysis
  • Data Communication
  • Wireless Applications