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,
Constant Delay
8-Pole, 6 zero,
Constant Delay
8-Pole, 6 zero,
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 f
c
D68
DP68
1 Hz to 100 kHz
1 Hz to 5 kHz
1 Hz to 100 kHz
1 Hz to 5 kHz
1 Hz to 100 kHz
1 Hz to 5 kHz
1 Hz to 100 kHz
1 Hz to 5 kHz
Theoretical Transfer
Characteristics
Appendix A
Page 4
Appendix A
Page 20
Appendix A
Page 21
Appendix A
Page 22
Passband Ripple
(theoretical)
0.0 dB
0.15 dB
0.15 dB
0.15 dB
DC Voltage Gain
(non-inverting)
0 ± 0.1 dB max.
0 ± 0.05 dB typ.
0 ± 0.1 dB max.
0 ± 0.05 dB typ.
0 ± 0.1 dB max.
0 ± 0.05 dB typ.
0 ± 0.1 dB max.
0 ± 0.05 dB typ.
Stopband
Attenuation Rate
48 dB/octave
60 dB min.
80 dB min.
100 dB min.
Cutoff Frequency
Stability
Amplitude
Phase
f
c
± 1% max.
± 0.01% /°C
-3dB
-182°
f
c
± 1% max.
± 0.01% /°C
-3dB
-306°
f
c
± 1% max.
± 0.01% /°C
-3dB
-306°
f
c
± 2% max.
± 0.01% /°C
-3dB
-311°
Filter Attenuation
(theoretical)
1.91 dB 0.80 f
c
3.01 dB 1.00 f
c
60.0 dB 4.52 f
c
80.0 dB 6.07 f
c
3.01 dB 1.00 f
c
40.0 dB 2.28 f
c
60.0 dB 2.64 f
c
3.01 dB 1.00 f
c
60.0 dB 3.08 f
c
80.0 dB 3.57 f
c
3.01 dB 1.00 f
c
80.0 dB 4.45 f
c
100.0 dB 5.20 f
c
Phase Match
1
0 - f
c
± 2° max.
± 1° typ.
0 - f
c
± 2° max.
± 1° typ.
0 - f
c
± 2° max.
± 1° typ.
0 - f
c
± 2° max.
± 1° typ.
Amplitude Accuracy
(theoretical)
0 - f
c
± 0.2 dB max.
± 0.1 dB typ.
0 - 0.8 f
c
± 0.2 dB max.
± 0.1 dB typ.
0 - 0.8 f
c
± 0.2 dB max.
± 0.1 dB typ.
0 - 0.8 f
c
± 0.2 dB max.
± 0.1 dB typ.
0.8 f
c
- 1.0 f
c
± 0.3 dB max.
±0 .15 dB typ.
0.8 f
c
- 1.0 f
c
± 0.3 dB max.
±0 .15 dB typ.
0.8 f
c
- 1.0 f
c
± 0.3 dB max.
± 0.15 dB typ.
Total Harmonic
Distortion @ 1 kHz
D68
DP68
<-100 dB typ.
<-80 dB typ.
<-100 dB typ.
<-80 dB typ.
<-100 dB typ.
<-80 dB typ.
<-100 dB typ.
<-80 dB typ.
Wide Band Noise
(5 Hz - 2 MHz)
200
m
Vrms typ.
200
m
Vrms typ.
200
m
Vrms typ.
200
m
Vrms typ.
Narrow Band Noise
(20 Hz - 100 kHz)
50
m
Vrms typ.
50
m
Vrms typ.
50
m
Vrms typ.
50
m
Vrms typ.
Filter Mounting
Assembly
FMA-01A
FMA-01A
FMA-01A
FMA-01A
3