D78 & DP78 Series
1.0 Hz to 100 kHz 32 Pin DIP
Fixed Frequency 8-Pole Filters
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.
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
Applications Available Low-Pass Models: . . . . . . . . . . . . . . . .
· Anti-alias filtering D78L8B 8-pole Butterworth . . . . . . . . . . . . . . .2
DP78L8B 8-pole Butterworth (Low Power) . . . . .2
· Vibration & shock analysis D78L8L 8-pole Bessel . . . . . . . . . . . . . . . . . . .2
· Automatic test equipment DP78L8L 8-pole Bessel (Low Power) . . . . . . . .2
· Aerospace, navigation and sonar Available High-Pass Models:
· Communication systems D78H8B 8-pole Butterworth . . . . . . . . . . . . . . .2
· Medical electronics General Specifications:
· Sound and vibration testing Pin-out/package data & ordering information . . . .3
· Noise elimination
· Process control
1
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
D78 & DP78 Series
8-Pole
Fixed Frequency Low-Pass and High-Pass Filters
Model D78L8B & DP78L8B D78L8L & DP78L8L Model D78H8B
Product Specifications Low-Pass Low-Pass High-Pass
Transfer Function 8-Pole, Butterworth 8-Pole, Bessel Transfer Function 8-Pole, Butterworth,
Size Size
D78 1.00 Hz to 1.00 kHz 1.8" x 0.8" x 0.5" 1.8" x 0.8" x 0.5" D78 1.00 Hz to 1.00 kHz 1.8" x 0.8" x 0.5"
D78 1.01 kHz to 100 kHz 1.8" x 0.8" x 0.3" 1.8" x 0.8" x 0.3" D78 1.01 kHz to 100 kHz 1.8" x 0.8" x 0.3"
DP78 1.00 Hz to 5.00 kHz 1.8" x 0.8" x 0.5" 1.8" x 0.8" x 0.5"
Range fc Range fc
D78 1 Hz to 100 kHz 1 Hz to 100 kHz D78 1 Hz to 100 kHz
DP78 1 Hz to 5 kHz 1 Hz to 5 kHz
Theoretical Transfer Appendix A Appendix A Theoretical Transfer Appendix A
Characteristics Page 9 Page 4 Characteristics Page 29
Passband Ripple 0.0 dB 0.0 dB Passband Ripple 0.0 dB
(theoretical) (theoretical)
DC Voltage Gain 0 ± 0.1 dB typ. 0 ± 0.1 dB typ. Voltage Gain 0 ± 0.1 dB to 100 kHz
(non-inverting) (non-inverting)
Stopband Stopband
Attenuation Rate 48 dB/octave 48 dB/octave Attenuation Rate 48 dB/octave
Power Bandwidth 120 kHz
Small Signal Bandwidth (-6 dB) 1 MHz
Cutoff Frequency fc ± 2% max. fc ± 2% max. Cutoff Frequency fc ± 2% max.
Stability ± 0.03% /°C ± 0.03% /°C Stability ± 0.03% /°C
Amplitude -3 dB -3 dB Amplitude -3 dB
Phase -360° -182° Phase -360°
Filter Attenuation 0.12 dB 0.80 fc 1.91 dB 0.80 fc Filter Attenuation 80 dB .31 fc
(theoretical) 3.01 dB 1.00 fc 3.01 dB 1.00 fc (theoretical) 60 dB .42 fc
60.0 dB 2.37 fc 60.0 dB 4.52 fc 3.01 dB 1.00 fc
80.0 dB 3.16 fc 80.0 dB 6.07 fc 0.00 dB 2.0 fc
Total Harmonic Total Harmonic
Distortion @ 1 kHz Distortion @ 1 kHz
D78 <-70 dB <-70 dB D78 <-70 dB
DP78 <-70 dB <-70 dB
Wide Band Noise 200 mVrms typ. 200 mVrms typ. Wide Band Noise 400 mVrms typ.
(5 Hz - 2 MHz) (5 Hz - 2 MHz)
Narrow Band Noise 50 mVrms typ. 50 mVrms typ. Narrow Band Noise 100 mVrms typ.
(20 Hz - 100 kHz) (20 Hz - 100 kHz)
Filter Mounting Filter Mounting
Assembly FMA-01A FMA-01A Assembly FMA-01A
2
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
D78 & DP78 Series
Specification Pin-Out and Package Data
(25°C and Vs ± 15 Vdc) Ordering Information
1
Analog Input Characteristics 0.80
Impedance 10 kW min.
Side View
Voltage Range ± 10 Vpeak All dimensions are in inches
All case dimensions ± 0.01"
Max. Safe Voltage ± Vs 0.025 dia.
Analog Output Characteristics 1.80
Impedance 1W
Linear Operating Range± 10 V 0.50
Maximum Current
2
Front View 0.30
D78 ± 10 mA 0.15 (min)
DP78 ± 5 mA
Offset Voltage 20 mV max. 0.80
1 3 mV typ. 0.70
OUT +VS -VS
Offset Temp. Coeff. 20 mV / °C typ.
Bottom View
Power Supply (±V)
GND IN
Rated Voltage ± 15 Vdc 0.10
Operating Range ± 5 to ± 18 Vdc 0.00
0.00
0.15
0.45
0.55
1.55
1.65
1.80
Maximum Safe Voltage ± 18 Vdc
Quiescent Current D78 Filter Mounting Assembly-See FMA-01A
12 mA max.
8 mA typ.
Quiescent Current DP78 Ordering Information
2.5 mA max.
1.5 mA typ. Filter Type Transfer Function
Temperature L - Low Pass B - Butterworth
Operating - 0 to + 70 °C H - High Pass L - Bessel
Storage - 25 to + 85 °C
Notes:
1. Input and output signal voltage referenced to
supply common.
D78L8B-849 Hz
2. Output is short circuit protected to common.
DO NOT CONNECT TO ±Vs.
Power Level 3
- 3 dB Corner Frequency
D Standard Power
e.g., 849 Hz
DP Low Power 2.50 kHz
33.3 kHz
3. 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 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-00D78-00
3
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
8-Pole
Bessel
Appendix A Low-Pass
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec)
-20
0.00 0.00 0.00 .506
Amp (dB)
0.10 -0.029 -18.2 .506 -40
0.20 -0.117 -36.4 .506
0.30 -0.264 -54.7 .506 -60
0.40 -0.470 -72.9 .506
0.50 -0.737 -91.1 .506
-80
0.60 -1.06 -109 .506
0.70 -1.45 -128 .506 -100
0.80 -1.91 -146 .506 2 3 4 5 6 78
0.85 -2.16 -155 .506 0.1 1.0 2 3 4 5 6 7 10.0
0.90 -2.42 -164 .506 Normalized Frequency(f/fc)
0.95 -2.71 -173 .506
1.00 -3.01 -182 .506
1.10 -3.67 -200 .506 Delay (Normalized)
1.20 -4.40 -219 .506
1.30 -5.20 -237 .506 1.0
1.40 -6.10 -255 .505
Delay (sec)
1.50 -7.08 -273 .504
1.60 -8.16 -291 .502
1.70 -9.36 -309 .498
1.80 -10.7 -327 .492 0.5
1.90 -12.1 -345 .482
2.00 -13.7 -362 .468
2.25 -18.1 -402 .417
2.50 -23.1 -436 .352
2.75 -28.3 -465 .291 0.0
0.15 2 3 4 5 6 7 89 1.5
0.1 1.0
3.00 -33.4 -489 .241 Normalized Time (1/f sec)
3.25 -38.3 -509 .201
3.50 -43.1 -526 .170
4.00 -51.8 -552 .126
5.00 -66.8 -587 .077 Step Response
Step Response (V/V)
6.00 -79.2 -610 .052 1.2
7.00 -89.8 -626 .038 1.0
8.00 -99.0 -638 .029
9.00 -107 -647 .023 0.8
10.0 -114 -655 .018
0.6
0.4
0.2
1.Normalized Group Delay:
-0.0
The above delay data is normalized to a corner frequency -0.2
of 1.0Hz.The actual delay is the normalized delay divided 0 1 2 3 4 5
by the actual corner frequency (fc).
Normalized Time (1/f sec)
Normalized Delay
Actual Delay =
Actual Corner Frequency (fc) in Hz
4
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
Low-Pass
8-Pole
Appendix A Butterworth
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec)
-20
0.00 0.00 0.00 .816
Amp (dB)
0.10 0.00 -29.4 .819 -40
0.20 0.00 -59.0 .828
0.30 0.00 -89.1 .843 -60
0.40 0.00 -120 .867
0.50 0.00 -152 .903
-80
0.60 -0.001 -185 .956
0.70 -0.014 -221 1.04 -100
0.80 -0.121 -261 1.19 2 3 4 5 6 78 1.0 2 3 4 5 67
0.85 -0.311 -283 1.29 0.1 10.0
0.90 -0.738 -307 1.40 Normalized Frequency(f/fc)
0.95 -1.58 -333 1.48
1.00 -3.01 -360 1.46
1.10 -7.48 -408 1.17 Delay (Normalized)
1.20 -12.9 -445 .873 2.0
1.30 -18.2 -472 .672
1.40 -23.4 -494 .540
Delay (sec)
1.50 -28.2 -511 .448
1.60 -32.7 -526 .380
1.70 -36.9 -539 .328 1.0
1.80 -40.8 -550 .287
1.90 -44.6 -560 .253
2.00 -48.2 -568 .226
2.25 -56.3 -586 .174
2.50 -63.7 -600 .139 0.0
2.75 -70.3 -611 .113 0.1 0.15 2 3 4 5 6 7 8 9 1.0 1.5
3.00 -76.3 -621 .094 Normalized Time (1/f sec)
3.25 -81.9 -629 .080
3.50 -87.1 -635 .069
4.00 -96.3 -646 .052
5.00 -112 -661 .033 Step Response
Step Response (V/V)
6.00 -125 -671 .023 1.2
7.00 -135 -678 .017
8.00 -144 -683 .013 1.0
9.00 -153 -687 .010 0.8
10.0 -160 -691 .008
0.6
0.4
0.2
1.Normalized Group Delay: -0.0
The above delay data is normalized to a corner frequency
of 1.0Hz.The actual delay is the normalized delay divided 0 1 2 3 4 5
by the actual corner frequency (fc). Normalized Time (1/f sec)
Normalized Delay
Actual Delay =
Actual Corner Frequency (fc) in Hz
9
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
High-Pass
8-Pole
Appendix A Butterworth
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec)
-20
0.10 -160 691 0.819
Amp (dB)
0.20 -112 661 0.828 -40
0.30 -83.7 631 0.843
0.40 -63.7 600 0.867 -60
0.50 -48.2 568 0.903
0.60 -35.5 535 .956 -80
0.70 -24.8 499 1.04
0.80 -15.6 459 1.19 -100
0.85 -11.6 437 1.29 2 3 4 5 6 78
0.90 -8.06 413 1.40 0.1 1.0 2 3 4 5 6 7 10.0
Normalized Frequency(f/fc)
0.95 -5.15 386 1.48
1.00 -3.01 360 1.46
1.20 -0.229 275 0.873
1.40 -0.020 226 0.540
1.60 -0.002 194 0.380
1.80 0.00 170 0.287
2.00 0.00 152 0.226
2.50 0.00 120 0.139
3.00 0.00 99.2 0.094
4.00 0.00 74.0 0.052
5.00 0.00 59.0 0.033
6.00 0.00 49.0 0.023
7.00 0.00 42.1 0.017
8.00 0.00 36.8 0.013
9.00 0.00 32.7 0.010
10.0 0.00 29.4 0.008
1.Normalized Group Delay:
The above delay data is normalized to a corner frequency
of 1.0Hz.The actual delay is the normalized delay divided
by the actual corner frequency (fc).
Normalized Delay
Actual Delay =
Actual Corner Frequency (fc) in Hz
29
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de