428 Series
8-Pole
4-Bit Programmable
Low-Pass Filters
Model
428L4L
428L4D60
428L4D80
428L4D10
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
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
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
0.1 dB max.
0.05 dB typ.
0
0
0.1 dB max.
0.05 dB typ.
0
0
0.1 dB max.
0.05 dB typ.
0
0
0.1 dB max.
0.05 dB typ.
Stopband
Attenuation Rate
48 dB/octave
60 dB min.
80 dB min.
100 dB min.
Cutoff Frequency
Stability
Amplitude
Phase
fc
2% max.
fc
2% max.
fc
2% max.
fc
2% max.
0.01% /°c
-3 dB
-182°
0.01% /°c
-3 dB
-306°
0.01% /°c
-3 dB
-306°
0.01% /°c
-3 dB
-311°
Filter Attenuation
(theoretical)
1.91 dB
3.01 dB
60.0 dB
80.0 dB
0.80 fc
1.00 fc
4.52 fc
6.07 fc
3.01 dB
40.0 dB
60.0 dB
1.00 fc
2.28 fc
2.64 fc
3.01 dB
60.0 dB
80.0 dB
1.00 fc 3.01 dB
3.08 fc 80.0 dB
3.57 fc 100.0 dB
1.00 fc
4.45 fc
5.20 fc
1
Phase Match
0 - fc
2° max.
1° typ.
0 - fc
2° max.
1° typ.
0 - fc
2° max.
1° typ.
0 - fc
2° max.
1° typ.
Amplitude Accuracy
(theoretical)
0 - fc
0.2 dB max. 0 - 0.8 fc
0.1 dB typ.
0.2 dB max. 0 - 0.8 fc
0.1 dB typ.
0.3 dB max. 0.8 fc-1.0 fc
0.15 dB typ.
0.2 dB max. 0 - 0.8 fc
0.1 dB typ.
0.3 dB max. 0.8 fc - 1.0 fc
0.15 dB typ.
0.2 dB max.
0.1 dB typ.
0.3 dB max.
0.15 dB typ.
0.8 fc -1.0 fc
Total Harmonic
< - 100 dB typ.
200 mVrms typ.
50 mVrms typ.
< - 100 dB typ.
200 mVrms typ.
50 mVrms typ.
< - 100 dB typ.
200 mVrms typ.
50 mVrms typ.
< - 100 dB typ.
200 mVrms typ.
50 mVrms typ.
Distortion @ 1 kHz
Wide Band Noise
(5 Hz - 2 MHz)
Narrow Band Noise
(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.
4
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