D78 & DP78 Series
1.0 Hz to 100 kHz
Fixed Frequency
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
• 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
1
32 Pin DIP
8-Pole Filters
Available
D78L8B
DP78L8B
D78L8L
DP78L8L
Low-Pass Models:
. . . . . . . . . . . . . . . .
8-pole Butterworth . . . . . . . . . . . . . . .2
8-pole Butterworth (Low Power) . . . . .2
8-pole Bessel . . . . . . . . . . . . . . . . . . .2
8-pole Bessel (Low Power) . . . . . . . .2
Available High-Pass Models:
D78H8B
8-pole Butterworth . . . . . . . . . . . . . . .2
General Specifications:
Pin-out/package data & ordering information . . . .3
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
D78 & DP78 Series
Fixed Frequency
Model
Product Specifications
Transfer Function
D78L8B & DP78L8B
Low-Pass
8-Pole, Butterworth
Low-Pass
8-Pole, Bessel
1.8” x 0.8” x 0.5”
1.8” x 0.8” x 0.3”
1.8” x 0.8” x 0.5”
1 Hz to 100 kHz
1 Hz to 5 kHz
Appendix A
Page 4
0.0 dB
0 ± 0.1 dB typ.
Transfer Function
8-Pole
Low-Pass and High-Pass Filters
D78L8L & DP78L8L
Model
D78H8B
High-Pass
8-Pole, Butterworth,
Size
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”
DP78
1.00 Hz to 5.00 kHz 1.8” x 0.8” x 0.5”
Range f
c
D78
DP78
Theoretical Transfer
Characteristics
Passband Ripple
(theoretical)
Size
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”
Range f
c
D78
Theoretical Transfer
Characteristics
Passband Ripple
(theoretical)
1 Hz to 100 kHz
1 Hz to 5 kHz
Appendix A
Page 9
0.0 dB
0 ± 0.1 dB typ.
1 Hz to 100 kHz
Appendix A
Page 29
0.0 dB
0 ± 0.1 dB to 100 kHz
DC Voltage Gain
(non-inverting)
Voltage Gain
(non-inverting)
Stopband
Attenuation Rate
48 dB/octave
48 dB/octave
Stopband
Attenuation Rate
Power Bandwidth
Small Signal Bandwidth
48 dB/octave
120 kHz
(-6 dB) 1 MHz
f
c
± 0.03% /°C
-3 dB
-360°
80 dB
60 dB
3.01 dB
0.00 dB
± 2% max.
Cutoff Frequency
Stability
Amplitude
Phase
Filter Attenuation
(theoretical)
f
c
± 0.03% /°C
-3 dB
-360°
0.12 dB
3.01 dB
60.0 dB
80.0 dB
± 2% max.
f
c
± 0.03% /°C
-3 dB
-182°
1.91 dB
3.01 dB
60.0 dB
80.0 dB
± 2% max.
Cutoff Frequency
Stability
Amplitude
Phase
Filter Attenuation
(theoretical)
0.80 f
c
1.00 f
c
2.37 f
c
3.16 f
c
0.80 f
c
1.00 f
c
4.52 f
c
6.07 f
c
.31 f
c
.42 f
c
1.00 f
c
2.0 f
c
Total Harmonic
Distortion @ 1 kHz
D78
DP78
Wide Band Noise
(5 Hz - 2 MHz)
<-70 dB
<-70 dB
200
mVrms
typ.
50
mVrms
typ.
<-70 dB
<-70 dB
200
mVrms
typ.
50
mVrms
typ.
Total Harmonic
Distortion @ 1 kHz
D78
Wide Band Noise
(5 Hz - 2 MHz)
<-70 dB
400
mVrms
typ.
100
mVrms
typ.
Narrow Band Noise
(20 Hz - 100 kHz)
Narrow Band Noise
(20 Hz - 100 kHz)
Filter Mounting
Assembly
FMA-01A
FMA-01A
Filter Mounting
Assembly
FMA-01A
2
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
D78 & DP78 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
1
W
Linear Operating Range± 10 V
2
Maximum Current
D78 ± 10 mA
DP78 ± 5 mA
Offset Voltage
20 mV max.
1
3 mV typ.
Offset Temp. Coeff.
20
mV
/ °C typ.
Power Supply (±V)
Rated Voltage
± 15 Vdc
Operating Range
± 5 to ± 18 Vdc
Maximum Safe Voltage ± 18 Vdc
Quiescent Current
D78
12 mA max.
8 mA typ.
Quiescent Current
DP78
2.5 mA max.
1.5 mA typ.
Temperature
Operating
-
0 to + 70 °C
Storage
- 25 to + 85 °C
Notes:
1. Input and output signal voltage referenced to
supply common.
2. Output is short circuit protected to common.
DO NOT CONNECT TO ±Vs.
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
0.50
0.15 (min)
0.80
0.70
OUT
+VS
-VS
Bottom View
GND
IN
0.10
0.00
0.00
0.15
0.45
0.55
1.55
1.65
1.80
Filter Mounting Assembly-See FMA-01A
Ordering Information
Filter Type
L
- Low Pass
H
- High Pass
Transfer Function
B
- Butterworth
L
- Bessel
D78L8B-849 Hz
Power Level
D
– Standard Power
DP
– Low Power
- 3 dB Corner Frequency
3
e.g., 849 Hz
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
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
8-Pole
Bessel
Appendix A
Theoretical Transfer Characteristics
1
f/fc
Amp
Phase
Delay
(Hz)
(dB)
(deg)
(sec)
0.00
0.00
0.00
.506
0.10
-0.029
-18.2
.506
0.20
-0.117
-36.4
.506
0.30
-0.264
-54.7
.506
0.40
-0.470
-72.9
.506
0.50
-0.737
-91.1
.506
0.60
-1.06
-109
.506
0.70
-1.45
-128
.506
0.80
-1.91
-146
.506
0.85
-2.16
-155
.506
0.90
-2.42
-164
.506
0.95
-2.71
-173
.506
1.00
-3.01
-182
.506
-3.67
1.10
-200
.506
-4.40
1.20
-219
.506
-5.20
1.30
-237
.506
1.40
-6.10
-255
.505
1.50
-7.08
-273
.504
1.60
-8.16
-291
.502
1.70
-9.36
-309
.498
1.80
-10.7
-327
.492
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
3.00
-33.4
-489
.241
3.25
-38.3
-509
.201
3.50
-43.1
-526
.170
4.00
-51.8
-552
.126
5.00
-66.8
-587
.077
6.00
-79.2
-610
.052
7.00
-89.8
-626
.038
8.00
-99.0
-638
.029
9.00
-107
-647
.023
10.0
-114
-655
.018
Low-Pass
Frequency Response
0
Amp (dB)
-20
-40
-60
-80
-100
0.1
2
1.0
2 3 4 5 6 7
10.0
Normalized Frequency(f/fc)
3 4 5 6 78
Delay
(Normalized)
1.0
Delay (sec)
0.5
0.0
0.1
0.15 2
3
4
5 6 7 89
Normalized Time (1/f sec)
1.0
1.5
Step Response
Step Response (V/V)
1.2
1.0
0.8
0.6
0.4
0.2
-0.0
-0.2
0
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).
Actual Delay =
Normalized Delay
Actual Corner Frequency (fc) in Hz
1
2
3
4
5
Normalized Time (1/f sec)
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
∑
Fax on Demand: 978/521-5178
4
Low-Pass
8-Pole
Appendix A
Theoretical Transfer Characteristics
1
f/fc
Amp
Phase
Delay
(Hz)
(dB)
(deg)
(sec)
0.00
0.00
0.00
.816
0.10
0.00
-29.4
.819
0.20
0.00
-59.0
.828
0.30
0.00
-89.1
.843
0.40
0.00
-120
.867
0.50
0.00
-152
.903
0.60
-0.001
-185
.956
0.70
-0.014
-221
1.04
0.80
-0.121
-261
1.19
0.85
-0.311
-283
1.29
0.90
-0.738
-307
1.40
0.95
-1.58
-333
1.48
1.00
-3.01
-360
1.46
1.10
-7.48
-408
1.17
1.20
-12.9
-445
.873
1.30
-18.2
-472
.672
1.40
-494
.540
-23.4
1.50
-511
.448
-28.2
1.60
-526
.380
-32.7
1.70
-539
.328
-36.9
1.80
-550
.287
-40.8
1.90
-44.6
-560
.253
2.00
-48.2
-568
.226
2.25
-56.3
-586
.174
2.50
-63.7
-600
.139
2.75
-70.3
-611
.113
3.00
-76.3
-621
.094
3.25
-81.9
-629
.080
3.50
-87.1
-635
.069
4.00
-96.3
-646
.052
5.00
-112
-661
.033
6.00
-125
-671
.023
7.00
-135
-678
.017
8.00
-144
-683
.013
9.00
-153
-687
.010
10.0
-160
-691
.008
Butterworth
Frequency Response
0
Amp (dB)
-20
-40
-60
-80
-100
0.1
2
3 4 5 6 78
1.0
2
3 4 5 67
10.0
Normalized Frequency(f/fc)
Delay
(Normalized)
2.0
Delay (sec)
1.0
0.0
0.1
0.15 2
3
4
5 6 7 8 9
1.0
1.5
Normalized Time (1/f sec)
Step Response
Step Response (V/V)
1.2
1.0
0.8
0.6
0.4
0.2
-0.0
0
1
2
3
4
Normalized Time (1/f sec)
5
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).
Actual Delay =
Normalized Delay
Actual Corner Frequency (fc) in Hz
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
∑
Fax on Demand: 978/521-5178
9
京公网安备 11010802033920号
EEWORLD
