The high frequency resistor programmable universal active filter is a CMOS chip that can be configured for Lowpass, Bandpass, Highpass, Elliptic, Notch or Allpass filters using external resistors. The filters come in one (8 pin) or two (16 pin) section versions. The device is a switched-capacitor filter using a topology that requires fewer pins, less power consumption and provides higher frequency performance than other switched-capacitor universal active filters. The clock to corner ratio as well as the Q are set by external resistors.

Depending on the filter type and response, from zero to nine external resistors are needed for each section. The sections may be cascaded to realize higher order filters.

The devices have a selectable nominal sample to corner ratio of either 6.25 to 1 or 12.5 to 1 and come in either a low power version (fo<100 kHz)or a higher power version (fo<500kHz). The devices are double sampled to reduce the clock frequency by a factor of two.


  • Low Power Consumption
  • High Frequency Operation
  • Low Cost
  • Small Package Size 8 or 16 pin DIP or SOIC
  • Wide Q Range 0.5 to over 20
  • Wide Clock to Center/Corner Frequency
  • Range 6.25:1 to over 50:1
  • Adjustable Gain
  • Accurate Switched-Capacitor Technology


  • General Purpose Filtering
  • Portable Equipment
  • Instrumentation