The lowpass filter has an elliptic response and is made in CMOS technology. It uses a switched capacitor filter implementation. No external components are necessary to set the filter characteristics. The cutoff frequency of the lowpass filter is selectable based on the clock frequency. Either an external clock or the on-chip oscillator can be used. Included in the integrated circuit are two op amps which can be configured by the user.

The clock to cutoff frequency ratio can be selected at either 50:1 or 100:1 by using the Clock to Corner Select pin. A current-saving power down mode can be chosen with the Power Select pin. In the low power mode the maximum corner frequency is 5kHz. In regular operation the maximum corner frequency is 20 kHz.


  • No response setting resistors
  • Plastic DIP or S.O. packages available
  • Switched Capacitor Filters
  • 3.3 or 5 Volts Operation
  • Operate from internal or external clock
  • Includes two uncommitted op amps
  • Power down mode
  • Selectable clock to corner frequency ratio


  • Two Way Radio
  • Telecommunications
  • Data Communications
  • Anti-Alias Filters
  • General Purpose Low-Pass Filters