428 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
4-Bit Programmable
1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot.
3
Model
428L4B
428L4E
428L4EX
428L4EY
Product Specifications
Transfer Function
8-Pole
8-Pole, 6 zero
Butterworth
Elliptic
Size
0.8” x 1.8” x 0.5”
0.8" x 1.8" x 0.5"
Range fc, fr
10.0 Hz to 102.4 kHz
Theoretical Transfer
Characteristics
Passband Ripple
0.0 dB
± 0.035 dB
-0.05 dB
(theoretical)
DC Voltage Gain
0 ± 0.1 dB max.
(non-inverting)
0 ± 0.05 dB typ.
Stopband
Attenuation Rate
48 dB/octave
80 dB min.
100 dB min.
Cutoff Frequency
fc
± 2% max.
fr
± 2% max.
fr
± 2% max.
fr
± 2% max.
Stability
± 0.01% /°c
Amplitude
-3 dB
-0.035 dB
-0.05 dB
Phase
-360°
-323.5°
-414°
-419°
Filter Attenuation
0.12 dB
0.80 fc
0.035 dB
1.00 fr
0.05 dB
1.00 fr
0.05 dB
1.00 fr
(theoretical)
3.01 dB
1.00 fc
3.01 dB
1.13 fr
3.01 dB
1.05 fr
3.01 dB
1.06 fr
60.0 dB
2.37 fc
60.0 dB
1.67 fr
60.0 dB
1.45 fr
80.0 dB
1.83 fr
80.0 dB
3.16 fc
80.0 dB
1.77 fr
80.0 dB
1.56 fr
100.0 dB
2.00 fr
Phase Match1
0 - 0.8 fc
± 2° max.
0 - 0.8 fr
± 2° max.
0 - 0.8 fr
± 3° max.
0 - 0.8 fr
± 3° max.
± 1° typ.
± 1.5° typ.
0.8 fc - 1.0 fc ± 3° max.
0.8 fr - 1.0 fr
± 4° max.
0.8 fr - 1.0 fr
± 4° max.
0.8 fr - 1.0 fr
± 4° max.
± 1.5° typ.
± 2° typ.
Amplitude Accuracy
0 - 0.8 fc
± 0.2 dB max.
0 - 0.8 fr
± .2 dB max.
0 - 0.8 fr
± 0.2 dB max. 0 - 0.8 fr
± 0.2 dB max.
(theoretical)
± 0.1 dB typ.
± .1 dB typ.
± 0.1 dB typ.
0.8 fc - 1.0 fc ± 0.3 dB max.
0.8 fr - 1.0 fr
± .3 dB max.
0.8 fr - 1.0 fr
± 0.5 dB max. 0.8 fr - 1.0 fr
± 0.5 dB max.
± 0.15 dB typ.
± .15 dB typ.
± 0.25 dB typ.
Total Harmonic
< - 100 dB typ.
< - 88 dB typ.
Distortion @ 1 kHz
Wide Band Noise
200
Vrms typ.
200
Vrms typ.
250
Vrms typ.
250
Vrms typ.
(5 Hz - 2 MHz)
Narrow Band Noise
50
Vrms typ.
50
Vrms typ.
75
Vrms typ.
75
Vrms typ.
(5 Hz - 100 kHz)
Filter Mounting
Assembly
FMA-02A