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ADV7176AKS Arkusz danych(PDF) 11 Page - Analog Devices

Numer części ADV7176AKS
Szczegółowy opis  High Quality, 10-Bit, Digital CCIR-601 to PAL/NTSC Video Encoder
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ADV7175A/ADV7176A
–11–
REV. B
signal compatible with worldwide standards. The 4:2:2 YUV
video data is interpolated to two times the pixel rate. The
color-difference components (UV) are quadrature modulated
using a subcarrier frequency generated by an on-chip 32-bit
digital synthesizer (also running at two times the pixel rate).
The two times pixel rate sampling allows for better signal-to-
noise-ratio. A 32-bit DDS with a 10-bit look-up table produces
a superior subcarrier in terms of both frequency and phase. In
addition to the composite output signal, there is the facility to
output S-Video (Y/C) video, YUV or RGB video. The Y/C,
YUV or RGB format is simultaneously available at the analog
outputs with the composite video signal.
Each analog output is capable of driving the full video-level
(35 mA) signal into an unbuffered, doubly terminated 75
load. With external buffering, the user has the additional option
to scale back the DAC output current to 5 mA min, thereby signifi-
cantly reducing the power dissipation of the device.
The ADV7175A/ADV7176A also supports both PAL and NTSC
square pixel operation.
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 signals.
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 standard
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 teletext
data during the vertical blanking interval.
The ADV7175A/ADV7176A modes are set up over a two-wire
serial bidirectional port (I
2C Compatible) with two slave addresses.
Functionally the ADV7175A and ADV7176A are the same with
the exception that the ADV7175A can output the Macrovision
anticopy algorithm.
The ADV7175A/ADV7176A is packaged in a 44-lead thermally
enhanced PQFP package.
DATA PATH DESCRIPTION
For PAL B, D, G, H, I, M, N and NTSC M 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 from
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
ADV7175A/ADV7176A supports PAL (B, D, G, H, I, N, M)
and NTSC (with and without Pedestal) standards. The ap-
propriate SYNC, BLANK and Burst levels are added to the
YCrCb data. Macrovision antitaping (ADV7175A 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 subcarrier
sine/cosine phases and added together to make up the chromi-
nance 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
appropriate 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 10-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
3. (Y/C) Signals.
Alternatively, each DAC can be individually powered off if not
required.
Video output levels are illustrated in Appendix 4 and Appendix 5.
INTERNAL FILTER RESPONSE
The Y filter supports several different frequency responses,
including two 4.5 MHz/5.0 MHz low pass responses, PAL/
NTSC subcarrier notch responses and a PAL/NTSC extended
response. The U and V filters have a 2/2.4 MHz low-pass
response for NTSC/PAL. These filter characteristics are illus-
trated in Figures 4 to 12.
MR04
MR03
NTSC
0
0
2.3
0.026
7.0
>54
4.2
PAL
0
0
3.4
0.098
7.3
>50
5.0
NTSC
0
1
1.0
0.085
3.57
>27.6
2.1
PAL
0
1
1.4
0.107
4.43
>29.3
2.7
NTSC/PAL
1
0
4.0
0.150
7.5
>40
5.65
NTSC
1
1
2.3
0.054
7.0
>54
4.2
PAL
1
1
3.4
0.106
7.3
>50.3
5.0
FILTER SELECTION
F3dB
PASSBAND
CUTOFF (MHz)
STOPBAND
CUTOFF (MHz)
PASSBAND
RIPPLE (dB)
STOPBAND
ATTENUATION (dB)
Figure 4. Luminance Internal Filter Specifications
NTSC
1.0
0.085
3.2
>40
0.3
2.05
PAL
1.3
0.04
4.0
>40
0.02
2.45
FILTER SELECTION
F3dB
PASSBAND
CUTOFF (MHz)
STOPBAND
CUTOFF (MHz)
PASSBAND
RIPPLE (dB)
STOPBAND
ATTENUATION (dB)
ATTENUATION @
1.3MHz (dB)
Figure 5. Chrominance Internal Filter Specifications
(Continued from page 1)


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