
Fixed Frequency
D70 Series
8-, 6-, 4-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.Phase Match and Amplitude Accuracy are within ±2% max., ±1% typ. of the theoretical transfer characteristics.
Model
D70L8B
D70L6B
D70L4B
Product Specifications
Transfer Function
8-Pole, Butterworth
6-Pole, Butterworth
4-Pole, Butterworth,
Size
0.84” x 0.65” x 0.31”
0.84” x 0.65” x 0.31”
0.65” x 0.51” x 0.31”
Range f
c
100 Hz to 50 kHz
100 Hz to 50 kHz
100 Hz to 50 kHz
Theoretical Transfer
Characteristics
Appendix A
Page 9
Appendix A
Page 8
Appendix A
Page 7
Passband Ripple
(theoretical)
0.0 dB
0.0 dB
0.0 dB
DC Voltage Gain
(non-inverting)
0 ± 0.02 dB typ.
0 ± 0.02 dB typ.
0 ± 0.02 dB typ.
Stopband
Attenuation Rate
48 dB/octave
36 dB/octave
24 dB/octave
Cutoff Frequency
Stability
Amplitude
Phase
f
c
± 2% max.
± 0.02% /°C
-3 dB
-360°
f
c
± 2% max.
± 0.02% /°C
-3 dB
-270°
f
c
± 2% max.
± 0.02% /°C
-3 dB
-180°
Filter Attenuation
(theoretical)
0.12 dB 0.80 f
c
3.01 dB 1.00 f
c
60.0 dB 2.37 f
c
80.0 dB 3.16 f
c
0.29 dB 0.80 f
c
3.01 dB 1.00 f
c
60.0 dB 3.16 f
c
80.0 dB 4.64 f
c
0.67 dB 0.80 f
c
3.01 dB 1.00 f
c
60.0 dB 5.62 f
c
80.0 dB 10.0 f
c
Phase Match
1
Amplitude Accuracy
1
(theoretical)
Total Harmonic
Distortion @ 1 kHz
< -90 dB
< -90 dB
< -90 dB
Wide Band Noise
(20 Hz - 4 MHz)
200
m
Vrms typ.
200
m
Vrms typ.
200
m
Vrms typ.
Narrow Band Noise
(5 Hz - 50 kHz)
50
m
Vrms typ.
50
m
Vrms typ.
50
m
Vrms typ.
Filter Mounting
Assembly
FMA-01A
FMA-01A
FMA-01A