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AN562
Application Notes
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Analog Devices AN562 Application Notes

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AN-562
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APPLICATION NOTE
One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106 • 781/329-4700 • World Wide Web Site: http://www.analog.com
Filter Specification for the Internal Filters of the
ADV7190/ADV7191/ADV7192/ADV7194 Video Encoders
INTRODUCTION
This application note documents the filter specifications and detailed plots of the internal filters of the ADV7190/ ADV7191, ADV7192 and ADV7194 video encoders.
All the above-mentioned devices provide two luma low­pass filters, two luma notch filters, an extended SSAF™ (Super Sub Alias Filter) luma low-pass filter, a luma CIF and a luma QCIF filter, five chroma low-pass filters, a Chroma CIF and a Chroma QCIF filter.
The SSAF filter, as can be seen in Figure 5, provides a sharp stopband attenuation that enables studio quality video playback on modern TVs, giving optimal horizon­tal line resolution.
Additionally, it is possible to change the response of the SSAF filter in the passband in using the programmable gain/attenuation feature or sharpness control as can be
seen in Figures 6, 7 and 8. Overall, there are six program­mable gain responses (Figure 7) and six programmable attenuation responses (Figure 8) in the range of –4 dB to +4 dB available. These responses can be programmed over the I
The tables on the following pages show the filter specifi­cations for all the filters in 2× oversampling and 4× oversampling mode.
Figures 1–17 highlight the frequency responses in the passband and stopband.
Figures 18–31 highlight the different frequency responses in 2× oversampling and 4× oversampling.
Tables I, II, III, and IV apply to the ADV7190/ADV7191, ADV7192 and ADV7194 video encoders.
2C®
interface.
Table I. Luminance Internal Filter Specifications (2ⴛ Oversampling)
Passband 3 dB Stopband Stopband
1
Ripple
Filter Type Filter Selection (dB) (MHz) (MHz) (dB)
MR04 MR03 MR02 Low-Pass (NTSC) 0 0 0 0.09 4.158 6.05 –65.7 Low-Pass (PAL) 0 0 1 0.15 4.74 6.41 –81.1 Notch (NTSC) 0 1 0 0.09 2.25/5.0/6.54 8.03 –88 Notch (PAL) 0 1 1 0.095 3.07/5.8/6.24 8.02 –80.5 Extended (SSAF) 1 0 0 0.017 6.37 8.03 –87.4 CIF 1 0 1 0.012 3.0 5.09 –69.2 QCIF 1 1 0 0.118 1.5 3.74 –88.4
NOTES
1
Passband Ripple refers to the maximum fluctuations from the 0 dB response in the passband, measured in dB. The passband is defined to have 0 (Hz) to fc (Hz) frequency limits for a low-pass filter, 0 (Hz) to f1 (Hz) and f2 (Hz) to infinity for a notch filter, where fc, f1, f2 are the –3 dB points.
2
3 dB bandwidth refers to the –3 dB cutoff frequency.
3
Stopband Cutoff refers to the frequency (MHz) at attenuation point (dB) referred to under Note 4.
4
Stopband Attenuation refers to the attenuation (dB) at the frequency (MHz) referred to under Note 3.
SSAF is a trademark of Analog Devices, Inc. I2C is a registered trademark of Philips Corporation.
Bandwidth
2
Cutoff
3
Attenuation
REV. 0
4
AN-562
Table II. Chrominance Internal Filter Specifications (2ⴛ Oversampling)
Passband 3 dB Stopband Stopband Ripple
1
Bandwidth
Filter Type Filter Selection (dB) (MHz) (MHz) (dB)
MR07 MR06 MR05
1.3 MHz Low-Pass 0 0 0 0.087 1.397 2.46 –84
0.65 MHz Low-Pass 0 0 1 Monotonic 0.653 2.41 –78.3
1.0 MHz Low-Pass 0 1 0 Monotonic 1.0 1.89 –66.6
2.0 MHz Low-Pass 0 1 1 0.0438 2.21 3.1 –65
3.0 MHz Low-Pass 1 0 0 Monotonic 3.18 5.33 –84.9 CIF 1 0 1 Monotonic 0.653 2.41 –78.3 QCIF 1 1 0 Monotonic 0.5 1.75 –33.17
Table III. Luminance Internal Filter Specifications (4ⴛ Oversampling)
Passband 3 dB Stopband Stopband Ripple
1
Bandwidth
Filter Type Filter Selection (dB) (MHz) (MHz) (dB)
MR04 MR03 MR02 Low-Pass (NTSC) 0 0 0 0.16 4.24 6.05 –75.2 Low-Pass (PAL) 0 0 1 0.1 4.81 6.41 –64.6 Notch (NTSC) 0 1 0 0.09 2.27/4.9/6.6 8.03 –87.3 Notch (PAL) 0 1 1 0.1 3.1/5.6/6.4 8.02 –79.7 Extended (SSAF) 1 0 0 0.043 6.45 8.03 –86.6 CIF 1 0 1 0.127 3.02 5.09 –62.6 QCIF 1 1 0 Monotonic 1.5 3.74 –88.2
2
2
Cutoff
Cutoff
3
3
Attenuation
Attenuation
4
4
Table IV. Chrominance Internal Filter Specifications (4ⴛ Oversampling)
Passband 3 dB Stopband Stopband Ripple
1
Bandwidth
2
Cutoff
3
Attenuation
Filter Type Filter Selection (dB) (MHz) (MHz) (dB)
MR07 MR06 MR05
1.3 MHz Low-Pass 0 0 0 0.09 1.395 2.46 –83.9
0.65 MHz Low-Pass 0 0 1 Monotonic 0.65 2.41 –71.1
1.0 MHz Low-Pass 0 1 0 Monotonic 1.0 1.89 –64.43
2.0 MHz Low-Pass 0 1 1 0.048 2.2 3.1 –65.9
3.0 MHz Low-Pass 1 0 0 Monotonic 3.2 5.3 –84.5 CIF 1 0 1 Monotonic 0.65 2.41 –71.1 QCIF 1 1 0 Monotonic 0.5 1.75 –33.1
NOTES
1
Passband Ripple refers to the maximum fluctuations from the 0 dB response in the passband, measured in dB. The passband is defined to have 0 (Hz) to fc (Hz) frequency limits for a low-pass filter, 0 (Hz) to f1 (Hz) and f2 (Hz) to infinity for a notch filter, where fc, f1, f2 are the –3 dB points.
2
3 dB bandwidth refers to the –3 dB cutoff frequency.
3
Stopband Cutoff refers to the frequency (MHz) at attenuation point (dB) referred to under Note 4.
4
Stopband Attenuation refers to the attenuation (dB) at the frequency (MHz) referred to under Note 3.
4
–2–
REV. 0
MAGNITUDE – dB
FREQUENCY – MHz
–70
0
71
MAGNITUDE – dB
23456
–10
–30
–40
–50
–60
–20
0
0
8
FREQUENCY – MHz
–70
0
71
MAGNITUDE – dB
23456
–10
–30
–40
–50
–60
–20
0
0
8
AN-562
0
0
–10
–20
–30
–40
–50
–60
–70
0
23456
FREQUENCY – MHz
71
Figure 1. Luma NTSC Low-Pass Filter (4
MAGNITUDE – dB
–10
–20
–30
–40
–50
–60
–70
×
0
0
0
Oversampling)
23456
FREQUENCY – MHz
71
Figure 2. Luma PAL Low-Pass Filter (4× Oversampling)
Figure 4. Luma PAL Notch Filter (4x Oversampling)
Figure 5. Extended (SSAF) Luma Filter (4x Oversampling)
0
0
–10
–20
–30
–40
MAGNITUDE – dB
–50
–60
–70
0
23456
FREQUENCY – MHz
8
71
Figure 3. Luma NTSC Notch Filter (4x Oversampling)
Figure 6. Extended (SSAF) Luma Filter
MAGNITUDE – dB
–10
–12
0
4
2
0
–2
–4
–6
–8
0
2345 6
FREQUENCY – MHz
71
(4x Oversampling) with Programmable Attenuation/Gain in the Passband
REV. 0
–3–
AN-562
5
4
3
2
MAGNITUDE – dB
1
0
–1
0
23456
FREQUENCY – MHz
71
Figure 7. Extended (SSAF) Luma Filter (4x Oversampling) Zoom In on Programmable Gain in the Passband
1
0
–1
0
0
–10
–20
–30
–40
MAGNITUDE – dB
–50
–60
–70
0
FREQUENCY – MHz
1.0 1.5 2.0 2.5 3.0
0.5
3.5 4.0
Figure 10. Luma QCIF Filter (4x Oversampling)
0
0
–10
–20
–2
MAGNITUDE – dB
–3
–4
–5
0
23456
FREQUENCY – MHz
71
Figure 8. Extended (SSAF) Luma Filter (4x Oversampling) Zoom In on Programmable Attenuation in the Passband
0
0
–10
–20
–30
–40
MAGNITUDE – dB
–50
–60
–30
–40
MAGNITUDE – dB
–50
–60
–70
0
FREQUENCY – MHz
0.4 0.6 0.8 1.0 1.2
0.2
1.4 1.6 1.8 2.0
Figure 11. Chroma 0.65 MHz Low-Pass Filter
0
0
–10
–20
–30
–40
MAGNITUDE – dB
–50
–60
–70
0
1
23456
FREQUENCY – MHz
Figure 9. Luma CIF Filter (4x Oversampling)
–70
0
0.4 0.6 0.8 1.0 1.2
0.2 FREQUENCY – MHz
Figure 12. Chroma 1.0 MHz Low-Pass Filter (4x Oversampling)
–4–
1.4 1.6 1.8 2.0
REV. 0
AN-562
0
0
–10
–20
–30
–40
MAGNITUDE – dB
–50
–60
–70
0
1.0 1.5 2.0 2.5 3.0
0.5 FREQUENCY – MHz
Figure 13. Chroma 1.3 MHz Low-Pass Filter (4x Oversampling)
0
0
–10
–20
–30
0
0
–10
–20
–30
–40
MAGNITUDE – dB
–50
–60
–70
0
FREQUENCY – MHz
0.4 0.6 0.8 1.0 1.2
0.2
1.4 1.6 1.8 2.0
Figure 16. Chroma CIF Filter (4x Oversampling)
0
0
–10
–20
–30
–40
MAGNITUDE – dB
–50
–60
–70
0
FREQUENCY – MHz
1.0 1.5 2.0 2.5 3.0
0.5
3.5 4.0
Figure 14. Chroma 2.0 MHz Low Pass Filter (4x Oversampling)
0
0
–10
–20
–30
–40
MAGNITUDE – dB
–50
–60
–70
0
1
23456
FREQUENCY – MHz
Figure 15. Chroma 3.0 MHz Filter (4x Oversampling)
–40
MAGNITUDE – dB
–50
–60
–70
0
FREQUENCY – MHz
1.0 1.5 2.0 2.5 3.0
0.5
3.5 4.0 4.5 5.0
Figure 17. Chroma QCIF Chroma Filter (4x Oversampling)
MAGNITUDE – dBMAGNITUDE – dB
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
510152025
510152025
FREQUENCY – MHz
2ⴛ OVERSAMPLING
4ⴛ OVERSAMPLING
Figure 18. Luma NTSC Low-Pass Filter
REV. 0
–5–
AN-562
0
–20
–40
–60
MAGNITUDE – dBMAGNITUDE – dB
–80
–20
–40
–60
–80
0
0
0
510152025
510152025
FREQUENCY – MHz
Figure 19. Luma PAL Low-Pass Filter
0
–20
–40
–60
MAGNITUDE – dBMAGNITUDE – dB
–80
–20
–40
–60
–80
0
0
0
510152025
510152025
FREQUENCY – MHz
Figure 20. Luma NTSC Notch Filter
2ⴛ OVERSAMPLING
4ⴛ OVERSAMPLING
2ⴛ OVERSAMPLING
4ⴛ OVERSAMPLING
MAGNITUDE – dBMAGNITUDE – dB
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
510152025
510152025
FREQUENCY – MHz
2ⴛ OVERSAMPLING
4ⴛ OVERSAMPLING
Figure 22. Extended (SSAF) Luma Filter
MAGNITUDE – dBMAGNITUDE – dB
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
510152025
510152025
FREQUENCY – MHz
2ⴛ OVERSAMPLING
4ⴛ OVERSAMPLING
Figure 23. Luma CIF Filter
0
–20
–40
–60
MAGNITUDE – dBMAGNITUDE – dB
–80
–20
–40
–60
–80
0
0
0
510152025
51015 2025
FREQUENCY – MHz
Figure 21. Luma PAL Notch Filter
2ⴛ OVERSAMPLING
4ⴛ OVERSAMPLING
–6–
MAGNITUDE – dBMAGNITUDE – dB
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
510152025
510152025
FREQUENCY – MHz
2ⴛ OVERSAMPLING
4ⴛ OVERSAMPLING
Figure 24. Luma QCIF Filter
REV. 0
AN-562
0
0
FREQUENCY – MHz
0
MAGNITUDE – dBMAGNITUDE – dB
510152025
510152025
–20
–40
–60
–80
0
–20
–40
–60
–80
2ⴛ OVERSAMPLING
4ⴛ OVERSAMPLING
0
–20
–40
–60
MAGNITUDE – dBMAGNITUDE – dB
–80
–20
–40
–60
–80
0
0
0
510152025
510152025
FREQUENCY – MHz
Figure 25. Chroma 0.65 MHz Filter
0
–20
–40
–60
MAGNITUDE – dBMAGNITUDE – dB
–80
–20
–40
–60
–80
0
0
0
510152025
510152025
FREQUENCY – MHz
Figure 26. Chroma 1.0 MHz Filter
2ⴛ OVERSAMPLING
4ⴛ OVERSAMPLING
2ⴛ OVERSAMPLING
4ⴛ OVERSAMPLING
0
–20
–40
–60
MAGNITUDE – dBMAGNITUDE – dB
–80
–20
–40
–60
–80
0
0
0
510152025
510152025
FREQUENCY – MHz
Figure 28. Chroma 2.0 MHz Filter
0
–20
–40
–60
MAGNITUDE – dBMAGNITUDE – dB
–80
–20
–40
–60
–80
0
0
0
510152025
510152025
FREQUENCY – MHz
Figure 29. Chroma 3.0 MHz Filter
2ⴛ OVERSAMPLING
4ⴛ OVERSAMPLING
2ⴛ OVERSAMPLING
4ⴛ OVERSAMPLING
0
–20
–40
–60
MAGNITUDE – dBMAGNITUDE – dB
–80
0
0
–20
–40
–60
–80
0
510152025
510152025
FREQUENCY – MHz
Figure 27. Chroma 1.3 MHz Filter
REV. 0
2ⴛ OVERSAMPLING
4ⴛ OVERSAMPLING
Figure 30. Chroma CIF Filter
–7–
AN-562
MAGNITUDE – dBMAGNITUDE – dB
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
510152025
510152025
FREQUENCY – MHz
Figure 31. Chroma QCIF Filter
2ⴛ OVERSAMPLING
4ⴛ OVERSAMPLING
E3816–0.5–4/00 (rev. 0)
–8–
PRINTED IN U.S.A.
REV. 0
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