ADV7191 Analog Devices, ADV7191 Datasheet - Page 13

• Manufacturer Part Number: ADV7191
• Description: Video Encoder with Six 10-Bit DACs and Video Encoder with Six DAC Outputs
• Manufacturer: Analog Devices

Each DAC can be individually powered off if not required. A
complete description of DAC output configurations is given in
the MR2 Bit Description section.
Video output levels are illustrated in Appendix 9.
INTERNAL FILTER RESPONSE
The Y Filter supports several different frequency responses
including two low-pass responses, two notch responses, an
Extended (SSAF) response with or without gain boost/attenuation,
a CIF response and a QCIF response. The UV Filter supports
several different frequency responses including five low-pass
responses, a CIF response and a QCIF response, as can be seen on
the following pages.
Filter Type
Low-Pass (NTSC)
Low-Pass (PAL)
Notch (NTSC)
Notch (PAL)
Extended (SSAF)
CIF
QCIF
NOTES
1
2
3
4
Filter Type
1.3 MHz Low-Pass
0.65 MHz Low-Pass
1.0 MHz Low-Pass
2.0 MHz Low-Pass
3.0 MHz Low-Pass
CIF
QCIF
NOTES
1
2
3
4
Passband ripple is defined to be fluctuations from the 0 dB response in the passband, measured in (dB). The passband is defined to have 0-fc frequency limits for a
3 dB bandwidth refers to the –3 dB cutoff frequency.
Stopband cutoff refers to the frequency at the attenuation point referred to under Note 4.
Stopband Attenuation refers to the attenuation point (dB) at the frequency referred to under Note 3.
Passband ripple is defined to be fluctuations from the 0 dB response in the passband, measured in (dB). The passband is defined to have 0-fc frequency limits for a
3 dB bandwidth refers to the –3 dB cutoff frequency.
Stopband cutoff refers to the frequency at the attenuation point referred to under Note 4.
Stopband Attenuation refers to the attenuation point (dB) at the frequency referred to under Note 3.
low-pass filter, 0–f1 and f2–infinity for a notch filter, where fc, f1, f2 are the –3 dB points.
low-pass filter, 0–f1 and f2–infinity for a notch filter, where fc, f1, f2 are the –3 dB points.
MR04 MR03 MR02
0
0
0
0
1
1
1
MR07 MR06 MR05
0
0
0
0
1
1
1
Filter Selection
Filter Selection
Table II. Chrominance Internal Filter Specifications (4
Table I. Luminance Internal Filter Specifications (4
0
0
1
1
0
0
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
0
1
0
1
0
1
0
Passband
Ripple
0.16
0.1
0.09
0.1
0.04
0.127
Monotonic
Passband
Ripple
0.09
Monotonic
Monotonic
0.048
Monotonic
Monotonic
Monotonic
1
1
(dB)
(dB)
In Extended Mode there is the option of twelve responses in
the range from –4 dB to +4 dB. The desired response can be
chosen by the user by programming the correct value via the
I
following pages. For more detailed plots refer to AN-562
Analog Devices’ Application note.
2
3 dB Bandwidth
(MHz)
4.24
4.81
2.3/4.9/6.6
3.1/5.6/6.4
6.45
3.02
1.5
3 dB Bandwidth
(MHz)
1.395
0.65
1.0
2.2
3.2
0.65
0.5
C. The variation of frequency responses can be seen on the
Oversampling)
2
2
Oversampling)
Stopband
Cutoff
6.05
6.41
8.03
8.02
8.03
5.09
3.74
Stopband
Cutoff
2.46
2.41
1.89
3.1
5.3
2.41
1.75
ADV7190/ADV7191
3
3
(MHz)
(MHz)
Stopband
Attentuation
–75.2
–64.6
–87.3
–79.7
–86.6
–62.6
–88.2
Stopband
Attentuation
–83.9
–71.1
–64.43
–65.9
–84.5
–71.1
–33.1
4
4
(dB)
(dB)