25 Locust St, Haverhill, Massachusetts 01830 Tel: 800/252-7074, 978/374-0761 FAX: 978/521-1839
e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
1.0 Hz to 100 kHz
Fixed Frequency
D68 & DP68 Series
32 Pin DIP
8-Pole Filters
Description
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.
Individual D68 filters can serve in low-pass or high-
pass applications (DP68, 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 (DP68,
1 Hz to 5 kHz) and operate with low total harmonic
distortion over a wide dynamic input voltage range
from non-critical +/-5V to +/-18V power supplies.
Features/Benefits:
Low harmonic distortion and wide signal-to-noise
ratio to 16 bit resolution.
Compact 1.8"L x 0.8"W x 0.3"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.
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:
. . . . . . . . . . .
Page
D68L8B & DP68L8B
8-pole Butterworth . . . . . . . . . . . . . . . . .2
D68L8E & DP68L8E
8-pole, 6 zero elliptic, 1.77 (-80dB) . . . .2
D68L8EX & DP68L8EX
8-pole, 6 zero elliptic, 1.56 (-80dB) . . . .2
D68L8EY & DP68L8EY
8-pole, 6 zero elliptic, 2.00 (-100dB) . . .2
D68L8L & DP68L8L
8-pole Bessel. . . . . . . . . . . . . . . . . . . . .3
D68L8D60 & DP68L8D60
8-pole constant delay (-60 dB) . . . . . . . .3
D68L8D & DP68L8D
8-pole constant delay (-80 dB) . . . . . . . .3
D68L8D10 & DP68L8D10
8-pole constant delay (-100 dB) . . . . . . .3
Available High-Pass Models:
. . . . . . . . . . . . . . . .
D68H8B
8-pole Butterworth . . . . . . . . . . . . . . . . .4
D68H8E
8-pole, 6 zero elliptic, 1.77 (-80dB) . . . .4
D68H8EX
8-pole, 6 zero elliptic, 1.56 (-80dB) . . . .4
D68H8EY
8-pole, 6 zero elliptic, 2.00 (-100dB) . . . .4
General Specifications:
Pin-out/package data & ordering information . . . . . .5
. . . . . . . . . . . . . . . .