| Low Pass Video Filter Series |
Printable HTM Datasheet
Printable .pdf File
- ATLW Stopband Ratio @45dB =
1.32
- ATCL Stopband Ratio @45dB = 1.14
- ATBW Stopband Ratio @45dB = 1.08
- ABW Stopband Ratio @42dB = 1.066
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For many
years amplitude, Delay and phase corrected filters have found applications
in Television Broadcasting, Cable transmission, Direct Satellite
Transmission, Analog and Digital Image Processing, Analog to Digital
conversion and Computer Graphics. Allen Avionics offers four basic shape
factors or stopband ratios in their range of Video.
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ATLW
General purpose filters include amplitude, Phase and Group Delay equalization
to improve pulse and bar response. Smooth slower roll off reduces ringing.
Can be used as in any Video bandwidth limiting application. Also used as
anti aliasing pre filters in analog to digital conversion applications or as
post aliasing filters with the addition of sin x/x correction.
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ATLW
Typical Response
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ATLW Amplitude & Return Loss
click to expand plot |
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ATCL
More complex filter for
applications
requiring a sharper cutoff
rate. The tight control of amplitude, phase and delay of the ATCL series
makes them ideal for high performance analog and digital applications.
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ATCL
Typical Response
click to expand plot |
ATCL Amplitude & Return Loss
click to expand plot |
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| ATBW Almost a Brickwall Filter.
The ATBW is a good compromise for sharpness, ringing, insertion loss and
cost. The ATBW stopband ratio of 1.08 is close to the ABW series Brickwall
ratio of 1.066 but has less ringing, Delay distortion and insertion loss. |
ATBW Typical Response
click to expand plot |
ATBW Amplitude & Return Loss
click to expand plot |
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ABW
A true Brickwall Filter. The ABW series is the sharpest cutoff Video filter
available anywhere. Tight control of the Amplitude, Phase and Delay
Characteristics create a filter unmatched for sharpness, low ringing,
insertion loss and cost. Typical NTSC applications use this filter to pass
4.20MHz and reject everything above 4.48MHz which requires a stopband ratio
of 1.066. See Brickwall data sheet.
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Basic ATLW Specifications
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ATLW PART NUMBER |
Fp
MHz Ap < .2db |
F3dB MHz |
Fs, MHz As >45dB |
Gd,
ns |
FGd MHz |
Pdns |
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ATLW0P46 |
0.46 |
0.52 |
0.61 |
220 |
0.44 |
5500 |
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ATLW0P93 |
0.93 |
1.03 |
1.22 |
110 |
0.89 |
2750 |
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ATLW1P40 |
1.40 |
1.55 |
1.85 |
75 |
1.33 |
1833 |
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ATLW1P87 |
1.87 |
2.06 |
2.47 |
55 |
1.78 |
1375 |
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ATLW2P34 |
2.34 |
2.58 |
3.09 |
45 |
2.22 |
1100 |
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ATLW2P57 |
2.57 |
2.84 |
3.40 |
40 |
2.45 |
1000 |
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ATLW2P80 |
2.80 |
3.09 |
3.70 |
37 |
2.67 |
917 |
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ATLW2P92 |
2.92 |
3.22 |
3.86 |
36 |
2.77 |
881 |
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ATLW3P27 |
3.27 |
3.61 |
4.32 |
32 |
3.11 |
786 |
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ATLW3P74 |
3.74 |
4.12 |
4.94 |
28 |
3.56 |
688 |
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ATLW3P97 |
3.97 |
4.38 |
5.25 |
26 |
3.78 |
647 |
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ATLW4P03 |
4.03 |
4.44 |
5.32 |
25 |
3.83 |
638 |
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ATLW4P21 |
4.21 |
4.64 |
5.56 |
25 |
4.00 |
611 |
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ATLW4P68 |
4.68 |
5.15 |
6.18 |
25 |
4.45 |
550 |
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ATLW4P91 |
4.91 |
5.41 |
6.48 |
21 |
4.67 |
524 |
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ATLW5P15 |
5.15 |
5.67 |
6.80 |
20 |
4.90 |
500 |
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ATLW5P43 |
5.43 |
5.98 |
7.17 |
19 |
5.16 |
474 |
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ATLW5P61 |
5.61 |
6.19 |
7.40 |
18 |
5.34 |
458 |
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ATLW6P08 |
6.08 |
6.70 |
8.03 |
17 |
5.79 |
423 |
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ATLW6P55 |
6.55 |
7.22 |
8.65 |
16 |
6.23 |
393 |
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ATLW7P02 |
7.02 |
7.73 |
9.27 |
15 |
6.68 |
367 |
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ATLW7P49 |
7.49 |
8.25 |
9.89 |
14 |
7.12 |
344 |
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ATLW7P95 |
7.95 |
8.76 |
10.50 |
13 |
7.57 |
324 |
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ATLW8P42 |
8.42 |
9.28 |
11.12 |
12 |
8.01 |
306 |
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ATLW8P89 |
8.89 |
9.79 |
11.74 |
12 |
8.46 |
289 |
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ATLW9P36 |
9.36 |
10.31 |
12.36 |
12 |
8.90 |
275 |
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PERFORMANCE
Passband
Flatness: Ripple Less than +/‑.1dB
Insertion Loss @ 100KHz =1.0dB Max
Impedance = 75 Ohms unbalanced
Return Loss = -20dB typical
Group Delay Ripple less than +/- 2% of midband delay
Stopband Attenuation = 45dB Min
Stopband Ratio = 1.32@-45dB
Temperature Range - Operating ‑20 to +65 Degrees Celsius
KEY
Fp
Frequency at which
amplitude ripple exceeds Ap (peak to peak ripple)
Fs
Frequency at which stopband attenuation exceeds As
F3dB
Nominal Frequency at which attenuation is 3dB
Pd
Nominal Propagation delay through filter in Nanoseconds
Gd
Typical passband group delay ripple, Nanoseconds peak‑to‑peak
FGd
Frequency at which group delay ripple limits is exceeded, MHz|
Ap
Peak‑to‑peak passband ripple, dB
As
Minimum stopband attenuation, dB |
ATLW
Typical Response
click to expand plot |
ATLW Amplitude & Return Loss
click to expand plot |
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Basic ATCL Specifications
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ATCL PART NUMBER |
Fp MHz Ap < .2db |
Fs, MHz As >45dB |
Gd, ns |
FGd MHz |
Pd
ns |
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ATCL0P46 |
0.46 |
0.53 |
265 |
0.43 |
8846 |
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ATCL0P93 |
0.93 |
1.06 |
134 |
0.86 |
4466 |
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ATCL1P40 |
1.40 |
1.60 |
89 |
1.30 |
2967 |
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ATCL1P87 |
1.87 |
2.13 |
67 |
1.73 |
2233 |
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ATCL2P34 |
2.34 |
2.66 |
53 |
2.17 |
1782 |
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ATCL2P57 |
2.57 |
2.92 |
49 |
2.39 |
1619 |
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ATCL2P80 |
2.80 |
3.19 |
45 |
2.60 |
1488 |
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ATCL2P92 |
2.92 |
3.32 |
43 |
2.71 |
1428 |
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ATCL3P27 |
3.27 |
3.72 |
38 |
3.04 |
1275 |
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ATCL3P74 |
3.74 |
4.26 |
33 |
3.48 |
1114 |
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ATCL3P97 |
3.97 |
4.52 |
32 |
3.69 |
1050 |
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ATCL4P03 |
4.03 |
4.59 |
31 |
3.75 |
1035 |
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ATCL4P21 |
4.21 |
4.80 |
30 |
3.91 |
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