The D68 and DP68 Series of small 8-pole fixed-frequency, precision active filters provide high performance linear active filtering in a compact 32-pin DIP package, with a broad range of corner frequencies and a choice of transfer functions.
The D68 and DP68 series are compact 8‑pole active filters offered in a 32‑pin DIP package (1.8" × 0.8" × 0.3"). Each filter is factory‑tuned to a user‑specified corner frequency and requires no external components or adjustments. The series includes low‑pass (D68) and low‑pass only (DP68) models, as well as high‑pass variants, covering a wide range of transfer functions such as Butterworth, Bessel, elliptic and constant‑delay.
These filters are intended for applications like anti‑alias filtering, data acquisition, communication systems, medical and aerospace electronics, as well as sound and vibration testing. Detailed specifications, pin‑out, power‑supply requirements and mounting information are provided for designers.
| Transfer Function (Low‑Pass) | 8‑Pole, Butterworth |
|---|---|
| Package Size | 1.8" x 0.8" x 0.3" |
| Frequency Range (D68) | 1 Hz to 100 kHz |
| Frequency Range (DP68) | 1 Hz to 5 kHz |
| Passband Ripple | 0.0 dB |
| DC Voltage Gain (non‑inverting) | 0 + 0.1 dB max. |
| Stopband Attenuation Rate (Butterworth) | 48 dB/octave |
| Stability | +0.01 %/°C |
The D68 series covers a corner frequency range from 1 Hz up to 100 kHz.
All models are housed in a 32‑pin DIP package measuring 1.8 inches long, 0.8 inches wide and 0.3 inches high.