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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
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
D68L8L & DP68L8L
D68L8D60 & DP68L8D60
D68L8D & DP68L8D
D68L8D10 & DP68L8D10
Product Specifications
Transfer Function
8-Pole, Bessel
8-Pole, 6 zero,
8-Pole, 6 zero,
8-Pole, 6 zero,
Constant Delay
Constant Delay
Constant Delay
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
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 4
Page 20
Page 21
Page 22
Passband Ripple
0.0 dB
0.15 dB
0.15 dB
0.15 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
60 dB min.
80 dB min.
100 dB min.
Cutoff Frequency
fc
± 1% max.
fc
± 1% max.
fc
± 1% max.
fc
± 2% max.
Stability
± 0.01% /°C
± 0.01% /°C
± 0.01% /°C
± 0.01% /°C
Amplitude
-3dB
-3dB
-3dB
-3dB
Phase
-182°
-306°
-306°
-311°
Filter Attenuation
1.91 dB
0.80 fc
3.01 dB
1.00 fc
3.01 dB
1.00 fc
3.01 dB
1.00 fc
(theoretical)
3.01 dB
1.00 fc
40.0 dB
2.28 fc
60.0 dB
3.08 fc
80.0 dB
4.45 fc
60.0 dB
4.52 fc
60.0 dB
2.64 fc
80.0 dB
3.57 fc
100.0 dB
5.20 fc
80.0 dB
6.07 fc
Phase Match1
0 - fc
± 2° max.
0 - fc
± 2° max.
0 - fc
± 2° max.
0 - fc
± 2° max.
± 1° typ.
± 1° typ.
± 1° typ.
± 1° typ.
Amplitude Accuracy
0 - fc
± 0.2 dB max.
0 - 0.8 fc
± 0.2 dB max.
0 - 0.8 fc
± 0.2 dB max.
0 - 0.8 fc
± 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 fc - 1.0 fc ± 0.3 dB max.
0.8 fc - 1.0 fc ± 0.3 dB max.
±0 .15 dB typ.
±0 .15 dB typ.
± 0.15 dB typ.
Total Harmonic
Distortion @ 1 kHz
D68
<-100 dB typ.
<-100 dB typ.
<-100 dB typ.
<-100 dB typ.
DP68
<-80 dB typ.
<-80 dB typ.
<-80 dB typ.
<-80 dB typ.
Wide Band Noise
200
mVrms typ.
200
mVrms typ.
200
mVrms typ.
200
mVrms typ.
(5 Hz - 2 MHz)
Narrow Band Noise
50
mVrms typ.
50
mVrms typ.
50
mVrms typ.
50
mVrms typ.
(20 Hz - 100 kHz)
Filter Mounting
Assembly
FMA-01A
FMA-01A
FMA-01A
FMA-01A
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