Home Up Free CD Cat. NAB Show '12 What's New Contact Us Literature Req.

Low Pass Video Filters

page lpvf
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

click to expand photo

 
 
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.
 
 
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.
 


ATLW Typical Response
click to expand plot


ATLW Amplitude & Return Loss
click to expand plot

 

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.


 


ATCL Typical Response
click to expand plot


ATCL Amplitude & Return Loss
click to expand plot

 
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

 
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.
Basic ATLW Specifications

ATLW PART NUMBER

Fp MHz Ap < .2db

F3dB MHz

Fs, MHz As >45dB

Gd, ns

FGd MHz

Pdns

ATLW0P46

0.46

0.52

0.61

220

0.44

5500

ATLW0P93

0.93

1.03

1.22

110

0.89

2750

ATLW1P40

1.40

1.55

1.85

75

1.33

1833

ATLW1P87

1.87

2.06

2.47

55

1.78

1375

ATLW2P34

2.34

2.58

3.09

45

2.22

1100

ATLW2P57

2.57

2.84

3.40

40

2.45

1000

ATLW2P80

2.80

3.09

3.70

37

2.67

917

ATLW2P92

2.92

3.22

3.86

36

2.77

881

ATLW3P27

3.27

3.61

4.32

32

3.11

786

ATLW3P74

3.74

4.12

4.94

28

3.56

688

ATLW3P97

3.97

4.38

5.25

26

3.78

647

ATLW4P03

4.03

4.44

5.32

25

3.83

638

ATLW4P21

4.21

4.64

5.56

25

4.00

611

ATLW4P68

4.68

5.15

6.18

25

4.45

550

ATLW4P91

4.91

5.41

6.48

21

4.67

524

ATLW5P15

5.15

5.67

6.80

20

4.90

500

ATLW5P43

5.43

5.98

7.17

19

5.16

474

ATLW5P61

5.61

6.19

7.40

18

5.34

458

ATLW6P08

6.08

6.70

8.03

17

5.79

423

ATLW6P55

6.55

7.22

8.65

16

6.23

393

ATLW7P02

7.02

7.73

9.27

15

6.68

367

ATLW7P49

7.49

8.25

9.89

14

7.12

344

ATLW7P95

7.95

8.76

10.50

13

7.57

324

ATLW8P42

8.42

9.28

11.12

12

8.01

306

ATLW8P89

8.89

9.79

11.74

12

8.46

289

ATLW9P36

9.36

10.31

12.36

12

8.90

275

 

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

 

Basic ATCL Specifications

ATCL PART NUMBER

Fp MHz Ap < .2db

Fs, MHz As >45dB

Gd, ns

FGd MHz

Pd

ns

ATCL0P46

0.46

0.53

265

0.43

8846

ATCL0P93

0.93

1.06

134

0.86

4466

ATCL1P40

1.40

1.60

89

1.30

2967

ATCL1P87

1.87

2.13

67

1.73

2233

ATCL2P34

2.34

2.66

53

2.17

1782

ATCL2P57

2.57

2.92

49

2.39

1619

ATCL2P80

2.80

3.19

45

2.60

1488

ATCL2P92

2.92

3.32

43

2.71

1428

ATCL3P27

3.27

3.72

38

3.04

1275

ATCL3P74

3.74

4.26

33

3.48

1114

ATCL3P97

3.97

4.52

32

3.69

1050

ATCL4P03

4.03

4.59

31

   3.75

1035

ATCL4P21

4.21

4.80

30

3.91

990

ATCL4P68

4.68

5.34

27

4.35

890

ATCL4P91

4.91

5.59

25

4.57

849

ATCL5P15

5.15

5.87

24

4.79

810

ATCL5P43

5.43

6.19

23

5.05

768

ATCL5P61

5.61

6.39

22

5.22

743

ATCL6P08

6.08

6.94

21

5.65

686

ATCL6P55

6.55

7.47

19

6.09

637

ATCL7P02

7.02

8.00

18

6.52

594

ATCL7P49

7.49

8.54

17

6.96

557

ATCL7P95

7.95

9.07

16

7.40

524

ATCL8P42

8.42

9.60

15

7.83

495

ATCL8P89

8.89

10.13

14

8.26

468

ATCL9P36

9.36

10.67

13

8.70

445

 
PERFORMANCE

Passband Flatness: Ripple Less than +/‑.1dB
Insertion Loss @ 100KHz =2.5dB Max
Impedance = 75 Ohms unbalanced
Return Loss = -20dB typical
Group Delay Ripple less than +/- 1.5% of midband delay
Stopband Attenuation = 45dB Min
Stopband Ratio = 1.14@-45dB
Temperature Range - Operating 0 to +50 Degrees Celsius 

 

 


ATCL Typical Response
click to expand plot


ATCL Amplitude & Return Loss
click to expand plot

 


Basic ATBW  Specifications

ATBW PART NUMBER

Fp MHz Ap < .2db

Fs, MHz As >45dB

Gd, ns

FGd MHz

Pd

ns

ATBW0P46

0.46

0.49

265

0.42

10612

ATBW0P93

0.93

1.00

140

0.86

5591

ATBW1P40

1.40

1.52

93

1.30

3710

ATBW1P87

1.87

2.02

70

1.72

2780

ATBW2P34

2.34

2.53

56

2.16

2222

ATBW2P57

2.57

2.78

51

2.37

2023

ATBW2P80

2.80

3.03

47

2.59

1857

ATBW2P92

2.92

3.15

45

2.70

1780

ATBW3P27

3.27

3.54

40

3.02

1590

ATBW3P74

3.74

4.04

35

3.45

1390

ATBW3P97

3.97

4.29

33

3.67

1310

ATBW4P03

4.03

4.35

33

3.72

1290

ATBW4P21

4.21

5.63

31

3.89

1235

ATBW4P68

4.68

5.05

28

4.32

1111

ATBW4P91

4.91

6.54

27

4.54

1059

ATBW5P15

5.15

5.56

26

4.76

1010

ATBW5P43

5.43

5.87

24

5.02

957

ATBW5P61

5.61

6.05

23

5.18

926

ATBW6P08

6.08

6.56

21

5.62

855

ATBW6P55

6.55

7.08

20

6.05

793

ATBW7P02

7.02

7.59

19

6.49

740

ATBW7P49

7.49

8.09

18

7.92

694

ATBW7P95

7.95

8.59

17

7.35

654

ATBW8P42

8.42

9.10

16

8.78

617

ATBW8P89

8.89

9.60

15

8.22

584

ATBW9P36

9.36

10.11

14

8.65

555

 

 

 

 

 

 

 

 

 
PERFORMANCE

Passband Flatness: Ripple Less than +/‑.1dB
Insertion Loss @ 100KHz =4dB
Impedance = 75 Ohms unbalanced
Return Loss = -20dB typical
Group Delay Ripple less than +/- 1.25% of midband delay
Stopband Attenuation = 45dB Min
Stopband Ratio = 1.08@-45dB
Temperature Range - Operating 0 to +50 Degrees Celsius 


ATBW Typical Response
click to expand plot


ATBW Amplitude & Return Loss
click to expand plot

 


Get More Information


Allen Avionics Home | Products | Video Hum and Noise Eliminators | Analog & Digital Delay Lines | Offset Marking Machine | Video Delay Lines | Video Filters | Brickwall Low Pass Filters | Filter Facts | Mechanical | General Purpose Delay Lines | Sales, Prices & Representatives | Glossary | About Hum | NTSC Video | Audio Ground Loop Isolation Transformers | Copyright | Feedback Page | What's New | Search | Site Map

Allen Avionics, Inc.
255 East Second Street, Mineola, NY  11501
Phone: (516) 248-8080
Fax:
(516) 747-6724
E-Mail: Info@AllenAvionics.com  

Allen Avionics 2000-2013

We are pleased to accept

It's your choice