1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176

e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com

0.02 Hz to 1.00 Hz

Fixed Frequency

D61 Series

32-Pin DIP

4 - Pole Filters

D61L4B

4-pole Butterworth . . . . . . . . . . . . . . . .2

D61L4L

4-pole Bessel . . . . . . . . . . . . . . . . . . . .2

D61H4B

4-pole Butterworth . . . . . . . . . . . . . . . .2

General Specifications:

Pin-out/package data & ordering information . . . .3

Description

The D61 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 D61 filters can serve in low-pass or high-

pass applications 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 0.02 Hz

and 1.00 Hz and operate with low total harmonic

distortion over a wide dynamic input voltage range

from non-critical +/-5V to +/-18V power supplies.

Applications

• Anti-alias filtering

• Data acquisition systems

• Communication systems and electronics

• Medical electronics equipment and research

• Aerospace, navigation and sonar applications

• Sound and vibration testing

• Acoustic and vibration analysis and control

• Noise elimination

• Signal reconstruction

Features/Benefits:

• Low harmonic distortion and wide signal-to-noise

ratio

• Compact 1.8"L x 0.8"W x 0.5"H minimizes board

space requirements.

• Plug-in ready-to-use, reducing engineering design

and manufacturing cycle time.

• Factory tuned, no external clocks or adjustments

needed

• Broad range of transfer characteristics and corner

frequencies to meet a wide range of applications.