
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
D78 & DP78 Series
32 Pin DIP
8-Pole Filters
Available Low-Pass Models:
  . . . . . . . . . . . . . . . .
D78L8B
8-pole Butterworth  . . . . . . . . . . . . . . .2
DP78L8B
 8-pole Butterworth (Low Power) . . . . .2
D78L8L
8-pole Bessel . . . . . . . . . . . . . . . . . . .2
DP78L8L
 8-pole Bessel (Low Power)  . . . . . . . .2
Available High-Pass Models:
D78H8B 
8-pole Butterworth  . . . . . . . . . . . . . . .2
General Specifications:
Pin-out/package data & ordering information . . . .3
Description
The D78 and DP78 Series of low-power, fixed-
frequency, linear active filters are high performance,
8-pole filters in a compact package. These
Butterworth and Bessel low-pass and Butterworth
high-pass filters (D78 only) combine linear active
filter design with the space savings of a 32-pin dual
in-line package (DIP). Each model comes factory
tuned to a user-specified corner frequency between
1 Hz and 100 kHz (DP78, 1 Hz to 5kHz). These fully
self-contained units require no external components
or adjustments and operate with dynamic input
voltage range from non-critical ±5V to ±18V power
supplies.
Applications
 Anti-alias filtering
 Vibration & shock analysis
 Automatic test equipment
 Aerospace, navigation and sonar
 Communication systems
 Medical electronics
 Sound and vibration testing
 Noise elimination
 Process control
Features/Benefits:
 Low cost solution for low frequency signal
conditioning
 Compact DIP design minimizes board space 
requirements
 Plug-in ready-to-use, reducing engineering design
and manufacturing time
 Factory tuned, no external clocks or adjustments
needed saving time and labor of other discrete
assembly solutions
 Low harmonic distortion and wide signal-to-noise
ratio to 12 bit resolution
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