D68 & DP68 Series
8-Pole
Low-Pass Filters
Fixed Frequency
Model
D68L8B & DP68L8B
D68L8E & DP68L8E
D68L8EX & DP68L8EX
D68L8EY & DP68L8EY
Product Specifications
Transfer Function
8-Pole, Butterworth
1.8” x 0.8” x 0.3”
8-Pole, 6 zero,
Elliptic
8-Pole, 6 zero,
Elliptic
8-Pole, 6 zero,
Elliptic
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”
Range fc, fr
D68
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
DP68
Theoretical Transfer
Characteristics
Appendix A
Page 9
Appendix A
Page 24
Appendix A
Page 23
Appendix A
Page 25
Passband Ripple
(theoretical)
0.0 dB
0.035 dB
-0.05 dB
-0.05 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
80 dB min.
80 dB min.
100 dB min.
Cutoff Frequency
Stability
Amplitude
Phase
fc
1% max.
fr
1% max.
fr
1% max.
fr
2% max.
0.01% /°C
-3 dB
-360°
0.01% /°C
-0.035 dB
-323.5°
0.01% /°C
-0.05 dB
-414°
0.01% /°C
-0.05 dB
-419°
Filter Attenuation
(theoretical)
0.12 dB
3.01 dB
60.0 dB
80.0 dB
0.80 fc
1.00 fc
2.37 fc
3.16 fc
0.035 dB
3.01 dB
60.0 dB
80.0 dB
1.00 fr
1.13 fr
1.67 fr
1.77 fr
0.05 dB
3.01 dB
60.0 dB
80.0 dB
1.00 fr 0.05 dB
1.00 fr
1.06 fr
1.83 fr
2.00 fr
1.05 fr 3.01 dB
1.45 fr 80.0 dB
1.56 fr 100.0 dB
1
Phase Match
0 - 0.8 fc
2° max.
1° typ.
3° max.
1.5° typ.
0 - 0.8 fr
2° max. 0 - 0.8 fr
1° typ.
3° max. 0 - 0.8 fr
1.5° typ.
4° max. 0.8 fr - 1.0 fr
2° typ.
3° max.
1.5° typ.
4° max.
2° typ.
0.8 fc - 1.0 fc
0.8 fr - 1.0 fr
4° max.
2° typ.
0.8 fr - 1.0 fr
Amplitude Accuracy
(theoretical)
0 - 0.8 fc
0.2 dB max. 0 - 0.8 fr
0.1 dB typ.
0.2 dB max. 0 - 0.8 fr
0.1 dB typ.
0.2 dB max. 0 - 0.8 fr
0.1 dB typ.
0.2 dB max.
0.1 dB typ.
0.5 dB max.
0.25 dB typ.
0.8 fc - 1.0 fc 0.3 dB max. 0.8 fr - 1.0 fr
0.15 dB typ.
0.3 dB max. 0.8 fr - 1.0 fr 0.5 dB max. 0.8 fr - 1.0 fr
0 .15 dB typ.
0.25 dB typ.
Total Harmonic
Distortion @ 1 kHz
D68
<-100 dB typ.
<-80 dB typ.
<-88 dB typ.
<-80 dB typ.
<-88 dB typ.
<-80 dB typ.
<-88 dB typ.
<-80 dB typ.
DP68
Wide Band Noise
(5 Hz - 2 MHz)
200 mVrms typ.
200 mVrms typ.
250 mVrms typ.
250 mVrms typ.
Narrow Band Noise
(20 Hz - 100 kHz)
50 mVrms typ.
50 mVrms typ.
75 mVrms typ.
75 mVrms typ.
Filter Mounting
Assembly
FMA-01A
FMA-01A
FMA-01A
FMA-01A
1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot.
2
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
FREQUENCYDEVICES [ FREQUENCY DEVICES, INC. ]
