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Fixed Frequency
D68 & DP68 Series
8-Pole
Low-Pass 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
2
1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot.
Model
D68L8B & DP68L8B
D68L8E & DP68L8E
D68L8EX & DP68L8EX
D68L8EY & DP68L8EY
Product Specifications
Transfer Function
8-Pole, Butterworth
8-Pole, 6 zero,
8-Pole, 6 zero,
8-Pole, 6 zero,
Elliptic
Elliptic
Elliptic
Size
1.8” x 0.8” x 0.3”
1.8” x 0.8” x 0.3”
1.8” x 0.8” x 0.3”
1.8” x 0.8” x 0.3”
Range fc, fr
D68
1 Hz to 100 kHz
1 Hz to 100 kHz
1 Hz to 100 kHz
1 Hz to 100 kHz
DP68
1 Hz to 5 kHz
1 Hz to 5 kHz
1 Hz to 5 kHz
1 Hz to 5 kHz
Theoretical Transfer
Appendix A
Appendix A
Appendix A
Appendix A
Characteristics
Page 9
Page 24
Page 23
Page 25
Passband Ripple
0.0 dB
± 0.035 dB
-0.05 dB
-0.05 dB
(theoretical)
DC Voltage Gain
0 ± 0.1 dB max.
0 ± 0.1 dB max.
0 ± 0.1 dB max.
0 ± 0.1 dB max.
(non-inverting)
0 ± 0.05 dB typ.
0 ± 0.05 dB typ.
0 ± 0.05 dB typ.
0 ± 0.05 dB typ.
Stopband
Attenuation Rate
48 dB/octave
80 dB min.
80 dB min.
100 dB min.
Cutoff Frequency
fc
± 1% max.
fr
± 1% max.
fr
± 1% max.
fr
± 2% max.
Stability
± 0.01% /°C
± 0.01% /°C
± 0.01% /°C
± 0.01% /°C
Amplitude
-3 dB
-0.035 dB
-0.05 dB
-0.05 dB
Phase
-360°
-323.5°
-414°
-419°
Filter Attenuation
0.12 dB
0.80 fc
0.035 dB
1.00 fr
0.05 dB
1.00 fr
0.05 dB
1.00 fr
(theoretical)
3.01 dB
1.00 fc
3.01 dB
1.13 fr
3.01 dB
1.05 fr
3.01 dB
1.06 fr
60.0 dB
2.37 fc
60.0 dB
1.67 fr
60.0 dB
1.45 fr
80.0 dB
1.83 fr
80.0 dB
3.16 fc
80.0 dB
1.77 fr
80.0 dB
1.56 fr
100.0 dB
2.00 fr
Phase Match1
0 - 0.8 fc
± 2° max.
0 - 0.8 fr
± 2° max.
0 - 0.8 fr
± 3° max.
0 - 0.8 fr
± 3° max.
± 1° typ.
± 1° typ.
± 1.5° typ.
± 1.5° typ.
0.8 fc - 1.0 fc
± 3° max.
0.8 fr - 1.0 fr
± 4° max.
0.8 fr - 1.0 fr
± 4° max.
0.8 fr - 1.0 fr
± 4° max.
± 1.5° typ.
± 2° typ.
± 2° typ.
± 2° typ.
Amplitude Accuracy
0 - 0.8 fc
± 0.2 dB max.
0 - 0.8 fr
± 0.2 dB max.
0 - 0.8 fr
± 0.2 dB max.
0 - 0.8 fr
± 0.2 dB max.
(theoretical)
± 0.1 dB typ.
± 0.1 dB typ.
± 0.1 dB typ.
± 0.1 dB typ.
0.8 fc - 1.0 fc ± 0.3 dB max.
0.8 fr - 1.0 fr ± 0.3 dB max.
0.8 fr - 1.0 fr ± 0.5 dB max.
0.8 fr - 1.0 fr
± 0.5 dB max.
± 0.15 dB typ.
±0 .15 dB typ.
± 0.25 dB typ.
± 0.25 dB typ.
Total Harmonic
Distortion @ 1 kHz
D68
<-100 dB typ.
<-88 dB typ.
<-88 dB typ.
<-88 dB typ.
DP68
<-80 dB typ.
<-80 dB typ.
<-80 dB typ.
<-80 dB typ.
Wide Band Noise
200
mVrms typ.
200
mVrms typ.
250
mVrms typ.
250
mVrms typ.
(5 Hz - 2 MHz)
Narrow Band Noise
50
mVrms typ.
50
mVrms typ.
75
mVrms typ.
75
mVrms typ.
(20 Hz - 100 kHz)
Filter Mounting
Assembly
FMA-01A
FMA-01A
FMA-01A
FMA-01A
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