The D64 and DP64 Series of small 4-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. Individual D64 filters can serve in low-pass or high-pass applications (DP64, low-pass only) or be combined to create custom band-pass or band-reject filters. These fully self-contained units require no external components or adjustments. Each model comes factory tuned to a user-specified corner frequency between 1 Hz and 100 kHz (DP64, 1 Hz to 5 kHz) and operate with low total harmonic distortion over a wide dynamic input voltage range
The D64 and DP64 series are 4‑pole fixed‑frequency active filters packaged in a 32‑pin DIP. They are factory‑tuned to a user‑specified corner frequency and require no external components or adjustments. The series includes low‑pass (D64) and high‑pass (DP64) models with Butterworth, Bessel and Chebyshev transfer functions.
Each filter operates from a wide power‑supply range and delivers low harmonic distortion, high signal‑to‑noise ratio, and tight amplitude accuracy. Detailed specifications, ordering information, and theoretical transfer characteristics are provided for each transfer‑function variant.
| Package | 32‑pin DIP, 1.8" L × 0.8" W × 0.3" H |
|---|---|
| Frequency Range (D64) | 1 Hz to 100 kHz |
| Frequency Range (DP64) | 1 Hz to 5 kHz |
| DC Voltage Gain | 0 + 0.1 dB max (non‑inverting) |
| Stopband Attenuation Rate | 24 dB/octave |
| Stability | ±0.01 %/°C |
| Power Supply Voltage | +5 V to +18 V (or ±5 V to ±18 V) |
| Quiescent Current (D64) | 12.5 mA typ. |
The D64 filters can be factory‑tuned to any corner frequency between 1 Hz and 100 kHz.
They operate from +5 V up to +18 V (or ±5 V to ±18 V) depending on the supply configuration.
A D64 filter draws about 12.5 mA of quiescent current.