D94 Series

1 Hz to 400 kHz*

Low Noise Fixed Frequency

4 - Pole Single Power Supply

Anti-Aliasing Low-Pass Filters

1

1784 Chessie Lane, Ottawa, Illinois 61350

• Tel:800/252-7074, 815/434-7800 • FAX:815/434-8176

e-mail: sales@freqdev.com

• Web Address: http://www.freqdev.com

Description:

The D94 Series of small 4-pole fixed-frequency,

precision active filters provide high performance

linear active filtering in a compact package, with a

broad range of corner frequencies and a choice

of Butterworth or Bessel transfer functions. These

filters are designed to work with up to 16 Bit A/D

converters. 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 400

kHz* and operate with low total harmonic

distortion over a wide dynamic input voltage

range from non-critical single +5VDC to +18VDC

power supply. Each filter has a built in internal

+6VDC and -6VDC power supplies to power the

filter.

Features/Benefits:

•

Low harmonic distortion and wide signal–

to–noise ratio to 16 bit resolution.

•

Available with Single or Differential inputs.

•

Available with DC coupled or AC coupled

inputs. (The AC corner frequency is a

single pole at 2 Hz.)

•

Compact 1.5"L x 2.0"W x 0.4"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.

•

Available in Butterworth or Bessel transfer

functions to meet a wide range of

applications.

•

Requires a single +5V to +18V power

supply to operate (The module generates

± 6 VDC internally to operate the filter).

•

One to one offset input that works with

your A/Ds reference output to set the

output of the filter in the center of your

A/Ds input range.

•

Available with built in gains from 0 dB to

60 dB.

* Bessel 1 Hz to 200 Khz

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

Available Low-Pass Models:

D94L4B

4-Pole Butterworth

D94L4L

4-Pole Bessel