參數(shù)資料
型號： ADV7175A
廠商： Analog Devices, Inc.
英文描述： High Quality, 10-Bit, Digital CCIR-601 to PAL/NTSC Video Encoder
中文描述： 高品質(zhì)，10位，數(shù)字無線電咨詢委員會，601到PAL / NTSC制式視頻編碼器
文件頁數(shù)： 11/52頁
文件大小： 629K
代理商： ADV7175A
ADV7175A/ADV7176A
–11–
REV. B
signal compatible with worldwide standards. T he 4:2:2 YUV
video data is interpolated to two times the pixel rate. T he
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).
T he 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. T he 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.
T he ADV7175A/ADV7176A also supports both PAL and NT SC
square pixel operation.
T he 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.
T hese timing signals can be adjusted to change pulsewidth and
position while the part is in the master mode. T he encoder
requires a single two times pixel rate (27 MHz) clock for standard
operation. Alternatively, the encoder requires a 24.54 MHz clock
for NT SC 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.
T he ADV7175A/ADV7176A modes are set up over a two-wire
serial bidirectional port (I
2
C 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.
T he ADV7175A/ADV7176A is packaged in a 44-lead thermally
enhanced PQFP package.
DAT A PAT H DE SCRIPT ION
For PAL B, D, G, H, I, M, N and NT SC M modes, YCrCb
4:2:2 data is input via the CCIR-656 compatible pixel port at a
27 MHz Data Rate. T he 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. T he
ADV7175A/ADV7176A supports PAL (B, D, G, H, I, N, M)
and NT SC (with and without Pedestal) standards. T he ap-
propriate SYNC, BLANK and Burst levels are added to the
Y CrCb 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. T he
interpolated data is filtered and scaled by three digital FIR
filters.
T he U and V signals are modulated by the appropriate subcarrier
sine/cosine phases and added together to make up the chromi-
nance signal. T he luma (Y) signal can be delayed 1–3 luma
cycles (each cycle is 74 ns) with respect to the chroma signal.
T he luma and chroma signals are then added together to make
up the composite video signal. All edges are slew rate limited.
T he Y CrCb data is also used to generate RGB data with
appropriate SY NC and BL ANK levels. T he RGB data is in
synchronization with the composite video output. Alternatively
analog YUV data can be generated instead of RGB.
T he four 10-bit DACs can be used to output:
1. Composite Video + RGB Video.
2. Composite Video + YUV Video
3. T wo 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.
INT E RNAL FILT E R RE SPONSE
T he Y filter supports several different frequency responses,
including two 4.5 MHz/5.0 MHz low pass responses, PAL/
NT SC subcarrier notch responses and a PAL/NT SC extended
response. T he U and V filters have a 2/2.4 MHz low-pass
response for NT SC/PAL. T hese filter characteristics are illus-
trated in Figures 4 to 12.
MR04
0
0
0
0
1
1
1
MR03
0
0
1
1
0
1
1
NTSC
PAL
NTSC
PAL
NTSC/PAL
NTSC
PAL
2.3
3.4
1.0
1.4
4.0
2.3
3.4
0.026
0.098
0.085
0.107
0.150
0.054
0.106
7.0
7.3
3.57
4.43
7.5
7.0
7.3
>
54
>
50
>
27.6
>
29.3
>
40
>
54
>
50.3
4.2
5.0
2.1
2.7
5.65
4.2
5.0
FILTER SELECTION
F
3dB
PASSBAND
CUTOFF (MHz)
STOPBAND
CUTOFF (MHz)
PASSBAND
RIPPLE (dB)
STOPBAND
ATTENUATION (dB)
Figure 4. Luminance Internal Filter Specifications
NTSC
PAL
1.0
1.3
0.085
0.04
3.2
4.0
>
40
>
40
0.3
0.02
2.05
2.45
FILTER SELECTION
F
3dB
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)
相關(guān)PDF資料
PDF描述
ADV7175AKS High Quality, 10-Bit, Digital CCIR-601 to PAL/NTSC Video Encoder
ADV7176A High Quality, 10-Bit, Digital CCIR-601 to PAL/NTSC Video Encoder
ADV7176AKS High Quality, 10-Bit, Digital CCIR-601 to PAL/NTSC Video Encoder
ADV7176A* High Quality. 10-Bit. Digital CCIR-601 to PAL/NTSC Video Encoder
ADV7175 Integrated Digital CCIR-601 YCrCb to PAL/NTSC Video Encoder
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADV7175AKS 制造商:AD 制造商全稱:Analog Devices 功能描述:High Quality, 10-Bit, Digital CCIR-601 to PAL/NTSC Video Encoder
ADV7175KS 制造商:AD 制造商全稱:Analog Devices 功能描述:Integrated Digital CCIR-601 YCrCb to PAL/NTSC Video Encoder
ADV7176 制造商:AD 制造商全稱:Analog Devices 功能描述:Integrated Digital CCIR-601 YCrCb to PAL/NTSC Video Encoder
ADV7176A 制造商:AD 制造商全稱:Analog Devices 功能描述:High Quality, 10-Bit, Digital CCIR-601 to PAL/NTSC Video Encoder
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