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
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