參數(shù)資料
型號(hào)： ADV7176KS
廠商： ANALOG DEVICES INC
元件分類(lèi)： 顏色信號(hào)轉(zhuǎn)換
英文描述： Integrated Digital CCIR-601 YCrCb to PAL/NTSC Video Encoder
中文描述： COLOR SIGNAL ENCODER, PQFP44
封裝： PLASTIC, QFP-44
文件頁(yè)數(shù)： 6/36頁(yè)
文件大?。?/td> 447K
代理商： ADV7176KS
ADV7175/ADV7176
REV. A
–6–
T he ADV7175/ADV7176 is protected by U.S. Patent Numbers
5,343,196 and 5,442,355 and other intellectual property rights.
DAT A PAT H DE SCRIPT ION
For PAL B, D, G, H, I, M, N and NT SC M, N modes, YCrCb
4:2:2 data is input via the CCIR-656 compatible pixel port at a
13.5 MHz data rate. T he pixel data is de-multiplexed to form
three data paths. Y has a range of 16 to 235, Cr and Cb have a
range of 128
±
112. T he ADV7175/ADV7176 supports PAL
(B, D, G, H, I, N, M) and NT SC (with and without Pedestal)
standards. T he appropriate SYNC, BLANK and burst levels are
added to the YCrCb data. Macrovision antitaping (ADV7175
only) and close-captioning levels are also added to Y and the
resultant data is interpolated to a rate of 27 MHz. T he interpo-
lated 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 YCrCb data is also used to generate RGB data with appro-
priate SYNC and BLANK levels. T he RGB data is in sychro-
nization 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. 10-bit composite video + 8-bit RGB video.
2. 10-bit composite video + 8-bit YUV video.
3. T wo 10-bit composite video signals
+ 10-bit LUMA & CHROMA (Y/C) signals.
Alternatively, each DAC can be individually powered off if not
required.
All possible video outputs are illustrated in Appendix 3, 4 and 5.
INT E RNAL FILT E R RE SPONSE
T he Y filter supports several different frequency responses in-
cluding two 4.5/5.0 MHz low-pass and PAL/NT SC subcarrier
notch responses. T he U and V filters have a 0.6/1 0.3 MHz
low-pass response.
T hese filter characteristics are illustrated in Figures 3 to 11.
(Continued from page 1)
T he ADV7175/ADV7176 also supports both a PAL and NT SC
square pixel mode in slave mode.
T he video encoder accepts an 8-bit parallel pixel data stream in
CCIR-656 format or a 16-bit parallel data stream. T his 4:2:2
data stream is interpolated into 4:4:4 component video (YUV).
T he YUV video 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 synthesizer
(also running at two times the pixel rate). T he two times pixel
rate sampling allows more accurate generation of the subcarrier
because frequency and phase errors are reduced by the higher
sampling rate. T he ADV7175/ADV7176 also offers the option to
output the YUV information directly.
T he luminance and chrominance components are digitally com-
bined and the resulting composite signal is output via a 10-bit
DAC. T hree additional 10-/8-bit DACs are provided to output
S-VHS Y/C Video (10 bits), YUV or RGB Video (8 bits).
T he output video frames are synchronized with the incoming
data timing reference codes. Optionally the encoder accepts (and
can generate)
HSYNC
,
VSYNC
& FIELD timing signals. T hese
timing signals can be adjusted to change pulse width and posi-
tion 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 24.54 MHz clock for NT SC
or 29.5 MHz clock for PAL square pixel mode operation. All in-
ternal clocks are generated on-chip. T he ADV7175/ADV7176
modes are set up over a two wire serial bidirectional port (I
2
C
Compatible) with two slave addresses.
Additionally, the ADV7175/ADV7176 allows a subcarrier phase
lock with an external video source and has a color bar generator
on-board.
Functionally the ADV7175 and ADV7176 are the same with
the exception that the ADV7175 can output the Macrovision
(Revision 6.1/7.x) anticopy algorithm.
T he ADV7175/ADV7176 is fabricated in a +5 V CMOS pro-
cess. Its monolithic CMOS construction ensures greater func-
tionality with low power dissipation.
T he ADV7175/ADV7176 is packaged in a 44-pin thermally en-
hanced PQFP package (patent pending).
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
7.5
8.0
3.57
4.43
8.0
7.5
8.0
>
50
>
51.3
>
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
CUT OFF (MHz)
STOPBAND
CUT OFF (MHz)
PASSBAND
RIPPLE (dB)
STOPBAND
ATTENUATION (dB)
Figure 3. Y Filter Specifications
NTSC
PAL
1.0
1.3
0.085
0.04
3.6
4.0
>
40
>
40
0.3
0.02
2.05
2.45
FILTER SELECTION
F
3dB
PASSBAND
CUT OFF (MHz)
STOPBAND
CUT OFF (MHz)
PASSBAND
RIPPLE (dB)
STOPBAND
ATTENUATION (dB)
ATTENUATION @
1.3MHz (dB)
Figure 4. UV Filter Specifications
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