The 424 Series are 4-pole digitally programmable low-pass and high-pass active filters. These new filters take advantage of the company's proprietary designs using surface-mount technology to provide a low profile, compact package in minimal board space. 424 filters are factory tuned to one of ten preset 4-bit binary ranges from 10 Hz to 102.4 kHz.
The Frequency Devices 424 Series consists of 4-pole digitally programmable low-pass and high-pass active filters housed in a compact 32-pin DIP package. These factory-tuned devices require no external components or adjustments, operating over a dynamic input voltage range from +12V to +18V.
The series offers various transfer functions including Butterworth, Bessel, and Chebychev options with ripple values of 0.0 dB, 0.2 dB, and 0.5 dB. Corner frequencies are programmable via a parallel set of CMOS switches accepting logic inputs from +5Vdc, allowing selection from ten preset binary ranges or custom discrete tuning up to a maximum span of 1000:1.
| Filter Type | 4-pole digitally programmable low-pass and high-pass active filters |
|---|---|
| Frequency Range | 10 Hz to 102.4 kHz |
| Package Type | 32-Pin DIP |
| Operating Voltage Range | +12V to +18V |
| Stopband Attenuation Rate | 24 dB/octave |
No, all models are fully finished filters that require no external components or adjustment.
The maximum span for custom discrete tuning ranges is 1000:1.