D68 & DP68 Series
1.0 Hz to 100 kHz
Fixed Frequency
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
32 Pin DIP
8-Pole Filters
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
D68 & DP68 Series
Specification
(25°C and Vs ± 15 Vdc)
Analog Input Characteristics
Impedance
10 kW min.
Voltage Range
± 10 Vpeak
Max. Safe Voltage
± Vs
Analog Output Characteristics
Impedance(Closed Loop)
1
W
typ.
10
W
max.
Linear Operating Range
± 10 V
2
Maximum Current
± 2 mA
3
Offset Voltage
2 mV typ.
20 mV max.
Offset Temp. Coeff.
50
mV
/ °C
Power Supply (±V)
Rated Voltage
Operating Range
Maximum Safe Voltage
Quiescent Current D68
1
Pin-Out and Package Data
Ordering Information
0.80
Side View
0.025 dia.
1.80
All dimensions are in inches
All case dimensions
±
0.01"
Front View
0.30
0.15 (min)
0.80
0.70
OUT
+VS
-VS OS
4
Bottom View
GND
IN
± 15 Vdc
± 5 to ± 18 Vdc
± 18 Vdc
± 25 mA typ.
± 40 mA max.
0.10
0.00
0.00
0.15
0.45
0.55
1.55
1.65
1.80
Filter Mounting Assembly-See FMA-01A
Quiescent Current DP68
± 7 mA typ.
± 10 mA max.
Temperature
Operating
Storage
-
0 to + 70 °C
- 25 to + 85 °C
Ordering Information
Filter Type
L
- Low Pass
H
- High Pass
Transfer Function
B
- Butterworth
L
- Bessel
D
- constant delay (-80 dB)
D60
- constant delay (-60 dB)
D10
- constant delay (-100 dB)
E
- elliptic 1.77 (-80 dB)
EX
- elliptic 1.56 (-80 dB)
EY
- elliptic 2.00 (-100 dB)
DC Offset Adjustment
± Vs
Do not connect
if trim is not
required.
20 k
W
(Cermet)
OS
Power Level
D68L8B-849 Hz
D
– Standard Power
DP
– Low Power
Notes:
- 3 dB Corner Frequency
5
e.g., 849 Hz
2.50 kHz
33.3 kHz
1. Input and output signal voltage referenced to supply common.
2. Output is short circuit protected to common. DO NOT CONNECT TO ±Vs.
3. Adjustable to zero.
- Vs
4. Units operate with or with out offset pin connected.
5. How to Specify Corner Frequency:
Corner frequencies are specified by attaching a three digit frequency
designator to the basic model number. Corner frequencies can range from
1.00 Hz to 100 kHz.
We hope the information given here will be helpful. The information is based on data and our best knowledge, and we consider the information to be true and accurate. Please read all statements,
recommendations or suggestions herein in conjunction with our conditions of sale which apply to all goods supplied by us. We assume no responsibility for the use of these statements,
recommendations or suggestions, nor do we intend them as a recommendation for any use which would infringe any patent or copyright.
IN-00D68-02
5
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
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