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ADV7171 데이터시트(PDF) 10 Page - Analog Devices

부품명 ADV7171
상세설명  Digital PAL/NTSC Video Encoder with 10-Bit SSAF??and Advanced Power Management
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ADV7170/ADV7171
–10–
REV. 0
GENERAL DESCRIPTION
The ADV7170/ADV7171 is an integrated digital video encoder
that converts Digital CCIR-601 4:2:2 8 or 16-bit component
video data into a standard analog baseband television signal
compatible with worldwide standards.
The on-board SSAF (Super Sub-Alias Filter) with extended
luminance frequency response and sharp stopband attenuation,
enables studio quality video playback on modern TVs, giving
optimal horizontal line resolution.
An advanced power management circuit enables optimal control
of power consumption in both normal operating modes and
power-down or sleep modes.
The ADV7170/ADV7171 also supports both PAL and NTSC
square pixel operation. The parts also incorporate WSS and
CGMS-A data control generation.
The output video frames are synchronized with the incoming
data timing reference codes. Optionally, the encoder accepts
(and can generate)
HSYNC, VSYNC and FIELD timing sig-
nals. These timing signals can be adjusted to change pulsewidth
and position while the part is in the master mode. The encoder
requires a single two times pixel rate (27 MHz) clock for stan-
dard operation. Alternatively, the encoder requires a 24.54 MHz
clock for NTSC or 29.5 MHz clock for PAL square pixel mode
operation. All internal timing is generated on-chip.
A separate teletext port enables the user to directly input tele-
text data during the vertical blanking interval.
The ADV7170/ADV7171 modes are set up over a two-wire
serial bidirectional port (I
2C Compatible) with two slave addresses.
Functionally, the ADV7171 and ADV7170 are the same with
the exception that the ADV7170 can output the Macrovision
anticopy algorithm.
The ADV7170/ADV7171 is packaged in a 44-lead PQFP pack-
age and a 44-lead TQFP package.
DATA PATH DESCRIPTION
For PAL B, D, G, H, I, M, N and NTSC M, N modes, YCrCb
4:2:2 data is input via the CCIR-656 Compatible Pixel Port at a
27 MHz data rate. The pixel data is demultiplexed to form
three data paths. Y typically has a range of 16 to 235, Cr and
Cb typically have a range of 128
± 112; however, it is possible
to input data from 1 to 254 on both Y, Cb and Cr. The ADV7170/
ADV7171 supports PAL (B, D, G, H, I, M, N) and NTSC
(with and without pedestal) standards. The appropriate
SYNC,
BLANK and Burst levels are added to the YCrCb
data. Macrovision antitaping (ADV7170 only), closed-captioning
and Teletext levels are also added to Y and the resultant data is
interpolated to a rate of 27 MHz. The interpolated data is
filtered and scaled by three digital FIR filters.
The U and V signals are modulated by the appropriate sub-
carrier sine/cosine phases and added together to make up the
chrominance signal. The luma (Y) signal can be delayed 1–3
luma cycles (each cycle is 74 ns) with respect to the chroma
signal. The luma and chroma signals are then added together to
make up the composite video signal. All edges are slew rate
limited.
The YCrCb data is also used to generate RGB data with ap-
propriate SYNC and
BLANK levels. The RGB data is in
synchronization with the composite video output. Alternatively,
analog YUV data can be generated instead of RGB.
The four l0-bit DACs can be used to output:
1. Composite Video + RGB Video.
2. Composite Video + YUV Video.
3. Two Composite Video Signals + LUMA and CHROMA
(Y/C) Signals.
Alternatively, each DAC can be individually powered off if not
required.
Video output levels are illustrated in Appendix 6.
INTERNAL FILTER RESPONSE
The Y filter supports several different frequency responses,
including two low-pass responses, two notch responses, an
extended (SSAF) response, a CIF response and a QCIF re-
sponse. The UV filter supports several different frequency re-
sponses, including four low-pass responses, a CIF response and
a QCIF response, these can be seen in the following Figures 4
to 18.
FILTER TYPE
FILTER SELECTION
PASSBAND RIPPLE
(dB)
3 dB BANDWIDTH
(MHz)
STOPBAND
CUTOFF (MHz)
STOPBAND
ATTENUATION (dB)
MR04
0
0
0
0
1
1
1
MR03
0
0
1
1
0
0
1
MR02
0
1
0
1
0
1
0
LOW PASS (NTSC)
LOW PASS (PAL)
NOTCH (NTSC)
NOTCH (PAL)
EXTENDED (SSAF)
CIF
QCIF
0.091
0.15
0.015
0.095
0.051
0.018
MONOTONIC
4.157
4.74
6.54
6.24
6.217
3.0
1.5
7.37
7.96
8.3
8.0
8.0
7.06
7.15
–56
–64
–68
–66
–61
–61
–50
Figure 4. Luminance Internal Filter Specifications
FILTER TYPE
FILTER SELECTION
PASSBAND RIPPLE
(dB)
3 dB BANDWIDTH
(MHz)
STOPBAND
CUTOFF (MHz)
STOPBAND
ATTENUATION (dB)
MR07
0
0
0
0
1
1
1
MR06
0
0
1
1
0
0
1
MR05
0
1
0
1
0
1
0
1.3 MHz LOW PASS
0.65 MHz LOW PASS
1.0 MHZ LOW PASS
2.0 MHz LOW PASS
RESERVED
CIF
QCIF
0.084
MONOTONIC
MONOTONIC
0.0645
0.084
MONOTONIC
1.395
0.65
1.0
2.2
0.7
0.5
3.01
3.64
3.73
5.0
3.01
4.08
–45
–58.5
–49
–40
–45
–50
Figure 5. Chrominance Internal Filter Specifications


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