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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
4-Bit Programmable
428 Series
8-Pole
Low-Pass Filters
Model
428L4L
428L4D60
428L4D80
428L4D10
Product Specifications
Transfer Function
8-Pole
8-Pole, 6 zero
8-Pole, 6 zero
8-Pole, 6 zero
Bessel
Constant Delay
Constant Delay
Constant Delay
Size
0.8” x 1.8” x 0.5”
0.8" x 1.8" x 0.5"
0.8" x 1.8" x 0.5"
0.8" x 1.8" x 0.5"
Range fc
10.0 Hz to 102.4 kHz
10.0 Hz to 102.4 kHz
10.0 Hz to 102.4 kHz
10.0 Hz to 102.4 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
± 2% max.
fc
± 2% max.
fc
± 2% max.
fc
± 2% max.
Stability
± 0.01% /°c
± 0.01% /°c
± 0.01% /°c
± 0.01% /°c
Amplitude
-3 dB
-3 dB
-3 dB
-3 dB
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
< - 100 dB typ.
< - 100 dB typ.
< - 100 dB typ.
< - 100 dB typ.
Distortion @ 1 kHz
Wide Band Noise
200
µVrms typ.
200
µVrms typ.
200
µVrms typ.
200
µVrms typ.
(5 Hz - 2 MHz)
Narrow Band Noise
50
µVrms typ.
50
µVrms typ.
50
µVrms typ.
50
µVrms typ.
(5 Hz - 100 kHz)
Filter Mounting
Assembly
FMA-02A
FMA-02A
FMA-02A
FMA-02A
1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot.
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