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 kHz to 1.28 MHz
8-Bit Programmable
818 Series
2" x 4"
8-Pole Filters
Description
The 818 Series are digitally programmable low-pass
and high-pass active filters that are tunable over a
256:1 frequency range. 818 filters are available with
any one of five standard factory-set tuning ranges or
8-bit custom ranges from 1 kHz to 1.28 MHz. These
units contain 8 CMOS logic inputs.
818 Series models are convenient, low profile, easy
to use fully finished filters which require no external
components or adjustments.
They feature low
harmonic distortion, and near theoretical amplitude
characteristics. 818 filters operate from non-critical
±12 to ±18 Vdc power supplies, have a 5 k
Ω (min.)
input impedance, a 10
Ω (max.) output impedance
and low-pass models offer dc voltage offset
adjustment.
Features/Benefits:
• Low harmonic distortion and wide signal-to-noise
ratio to 12-bit resolution
• Digitally programmable corner frequency allows
selecting cut-off frequencies specific to each
application
• Plug-in ready-to-use, reducing engineering design
and manufacturing cycle time
• Factory-set tuning range, no external clocks or
adjustments needed
• Broad range of transfer characteristics and corner
frequencies to meet a wide range of applications
Applications
• Anti-alias and band-pass filtering
• Data acquisition systems
• Satellite and telecommunications
• Acoustic and vibration analysis and control
• Aerospace, navigation and sonar
• Medical research and electronic equipment
• Engine test and simulation
• Noise elimination
• Video systems
• Signal reconstruction
Programmable Specifications. . . . . . . . . . . . . . Page
Digital Tuning & Control . . . . . . . . . . . . . . . . . . . . . . 2
Available Low-Pass Models: . . . . . . . . . . . . . . . Page
818L8B
8-pole Butterworth . . . . . . . . . . . . . . . . . . 3
818L8L
8-pole Bessel . . . . . . . . . . . . . . . . . . . . . . 3
818L8E
8-pole, 6-zero elliptic, 1.77 . . . . . . . . . . . . 3
818L8D80 8-pole, 6-zero constant delay . . . . . . . . . . 3
Available High-Pass Models: . . . . . . . . . . . . . . Page
818H8B
8-pole Butterworth . . . . . . . . . . . . . . . . . . 4
818H8E
8-pole, 6-zero elliptic, 1.77 . . . . . . . . . . . . 4
General Specifications:
Phase and phase match considerations . . . . . . . 5 & 6
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . 7
Pin-out/package data . . . . . . . . . . . . . . . . . . . . . . . . . 7
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