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ADV7175 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADV7175
Beschreibung Integrated Digital CCIR-601 YCrCb to PAL/NTSC Video Encoder
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
ADV7175 Datasheet, Funktion
a
Integrated Digital CCIR-601
YCrCb to PAL/NTSC Video Encoder
ADV7175/ADV7176
FEATURES
Close Captioning Support
CCIR-601 YCrCb to PAL/NTSC Video Encoder
Teletext Support (Passthrough Mode)
Single 27 MHz Clock Required (؋2 Oversampling)
On-Board Color Bar Generation
Pixel Port Supports:
CCIR-656 4:2:2 8-Bit Parallel Input Format
On-Board Voltage Reference
2-Wire Serial MPU Interface (I2C Compatible)
4:2:2 16-Bit Parallel Input Format
+5 V CMOS Monolithic Construction
SMPTE 170M NTSC Compatible Composite Video Output
44-Pin PQFP Thermally Enhanced Package
CCIR624/CCIR601 PAL Compatible Composite Video Output
SCART/PeriTV Support
YUV Output Mode
Simultaneous Composite and S-VHS Y/C or RGB YUV
Video Outputs
Programmable Luma Filters (Low-Pass/Notch)
Square Pixel Support (Slave Mode)
Allows Subcarrier Phase Locking with External Video
Source
APPLICATIONS
MPEG-1 and MPEG-2 Video
DVD
Digital Satellite/Cable Systems (Set Top Boxes/IRDs)
Video Games
CD Video/Karaoke
Professional Studio Quality
PC Video/Multimedia
10-Bit DAC Resolution for Encoded Video Channels
8-Bit DAC Resolution for RGB Output
YUV Interpolation for Accurate Subcarrier Construction
Programmable Subcarrier Frequency and Phase
Programmable LUMA Delay
Color Signal Control/Burst Signal Control
Interlaced/Noninterlaced Operation
Complete On-Chip Video Timing Generator
Master/Slave Operation Supported
Master Mode Timing Programmability
Macrovision Antitaping Facility Rev 6.1/7.x (ADV7175 Only)*
GENERAL DESCRIPTION
The ADV7175/ADV7176 is an integrated digital video encoder
that converts Digital CCIR-601 4:2:2 component video data into a
standard analog baseband television signal compatible with world
wide standards NTSC, PAL B/D/G/H/I, PAL M or PAL N. In
addition to the composite output signal, there is the facility to out-
put S-VHS 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 generates a
standard video-level signal into a doubly terminated 75 load.
(Continued on page 6)
FUNCTIONAL BLOCK DIAGRAM
VAA
RESET
COLOR
DATA
P7–P0
P15–P8
8
4:2:2 TO
4:4:4
INTER-
POLATOR
8
8
YCrCb
TO
YUV
MATRIX
HSYNC
FIELD/VSYNC
BLANK
VIDEO TIMING
GENERATOR
YUV TO
RBG
MATRIX
8
8
8
8
ADD 8
INTER-
8
Y 10
LOW-PASS
SYNC
POLATOR
FILTER
8
ADD 8
BURST
INTER- 8
POLATOR
U 10
LOW-PASS
FILTER
8 ADD 8
BURST
I2C MPU PORT
INTER- 8
POLATOR
V
LOW-PASS
FILTER
REAL-TIME
CONTROL
CIRCUIT
10
10 10
SIN/COS
DDS BLOCK
M
U 10
L
T
I
P
10
L
E
X 10
E
R
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10 10-BIT
DAC
ADV7175/ADV7176
VOLTAGE
REFERENCE
CIRCUIT
GREEN/
LUMA/
Y
RED/
CHROMA/
V
BLUE/
COMPOSITE/
U
COMPOSITE
VREF
RSET
COMP
CLOCK
SCLOCK SDATA ALSB
SCRESET/RTC
GND
*This device is protected by U.S. Patent Numbers 4631603, 4577216, 4819098 a nd other intellectual property rights. The Macrovision anticopy process is
licensed for noncommercial home use only, which is its sole intended use in the devic e. Please contact sales office for latest Macrovision version available.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703






ADV7175 Datasheet, Funktion
ADV7175/ADV7176
(Continued from page 1)
The ADV7175/ADV7176 also supports both a PAL and NTSC
square pixel mode in slave mode.
The video encoder accepts an 8-bit parallel pixel data stream in
CCIR-656 format or a 16-bit parallel data stream. This 4:2:2
data stream is interpolated into 4:4:4 component video (YUV).
The YUV video 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 synthesizer
(also running at two times the pixel rate). The two times pixel
rate sampling allows more accurate generation of the subcarrier
because frequency and phase errors are reduced by the higher
sampling rate. The ADV7175/ADV7176 also offers the option to
output the YUV information directly.
The luminance and chrominance components are digitally com-
bined and the resulting composite signal is output via a 10-bit
DAC. Three additional 10-/8-bit DACs are provided to output
S-VHS Y/C Video (10 bits), YUV or RGB Video (8 bits).
The output video frames are synchronized with the incoming
data timing reference codes. Optionally the encoder accepts (and
can generate) HSYNC, VSYNC & FIELD timing signals. These
timing signals can be adjusted to change pulse width and posi-
tion 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 24.54 MHz clock for NTSC
or 29.5 MHz clock for PAL square pixel mode operation. All in-
ternal clocks are generated on-chip. The ADV7175/ADV7176
modes are set up over a two wire serial bidirectional port (I2C
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.
The ADV7175/ADV7176 is fabricated in a +5 V CMOS pro-
cess. Its monolithic CMOS construction ensures greater func-
tionality with low power dissipation.
The ADV7175/ADV7176 is packaged in a 44-pin thermally en-
hanced PQFP package (patent pending).
The ADV7175/ADV7176 is protected by U.S. Patent Numbers
5,343,196 and 5,442,355 and other intellectual property rights.
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
13.5 MHz data rate. The 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. The ADV7175/ADV7176 supports PAL
(B, D, G, H, I, N, M) and NTSC (with and without Pedestal)
standards. The 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. The interpo-
lated 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 appro-
priate SYNC and BLANK levels. The RGB data is in sychro-
nization 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. 10-bit composite video + 8-bit RGB video.
2. 10-bit composite video + 8-bit YUV video.
3. Two 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.
INTERNAL FILTER RESPONSE
The Y filter supports several different frequency responses in-
cluding two 4.5/5.0 MHz low-pass and PAL/NTSC subcarrier
notch responses. The U and V filters have a 0.6/1 0.3 MHz
low-pass response.
These filter characteristics are illustrated in Figures 3 to 11.
FILTER SELECTION
NTSC
PAL
NTSC
PAL
NTSC/PAL
NTSC
PAL
MR04
0
0
0
0
1
1
1
MR03
0
0
1
1
0
1
1
PASSBAND
PASSBAND
STOPBAND
CUT OFF (MHz) RIPPLE (dB) CUT OFF (MHz)
2.3
0.026
7.5
3.4
0.098
8.0
1.0
0.085
3.57
1.4
0.107
4.43
4.0
0.150
8.0
2.3
0.054
7.5
3.4
0.106
8.0
STOPBAND
ATTENUATION (dB)
>50
>51.3
>27.6
>29.3
>40
>54
>50.3
F3dB
4.2
5.0
2.1
2.7
5.65
4.2
5.0
FILTER SELECTION
NTSC
PAL
Figure 3. Y Filter Specifications
PASSBAND
CUT OFF (MHz)
1.0
1.3
PASSBAND
RIPPLE (dB)
0.085
0.04
STOPBAND
CUT OFF (MHz)
3.6
4.0
STOPBAND
ATTENUATION (dB)
>40
>40
ATTENUATION @
1.3MHz (dB)
0.3
0.02
F3dB
2.05
2.45
Figure 4. UV Filter Specifications
–6–
REV. A

6 Page









ADV7175 pdf, datenblatt
ADV7175/ADV7176
Mode 1: Master Option. HSYNC, BLANK, FIELD.
(Timing Register 0 TR0 = X X X X X 0 1 1)
In this mode the ADV7175/ADV7176 can generate horizontal SYNC and Odd/Even FIELD signals. A transition of the FIELD
input when HSYNC is low indicates a new frame i.e., vertical retrace. The BLANK signal is optional. When the BLANK input is
disabled the ADV7175/ADV7176 automatically blanks all normally blank lines as per CCIR-624. Pixel data is latched on the rising
clock edge following the timing signal transitions. Mode 1 is illustrated in Figure 17 (NTSC) and Figure 18 (PAL). Figure 19 illus-
trates the HSYNC, BLANK and FIELD for an odd or even field transition relative to the pixel data.
HSYNC
FIELD
BLANK
PAL = 12 * CLOCK/2
NTSC = 16 * CLOCK/2
PIXEL
DATA
Cb Y Cr Y
PAL = 132 * CLOCK/2
NTSC = 118 * CLOCK/2
Figure 19. Timing Mode 1 Odd/Even Field Transitions
Mode 2: Slave Option. HSYNC, VSYNC, BLANK.
(Timing Register 0 TR0 = X X X X X 1 0 0)
In this mode the ADV7175/ADV7176 accepts horizontal and vertical SYNC signals. A coincident low transition of both HSYNC
and VSYNC inputs indicates the start of an odd field. A VSYNC low transition when HSYNC is high indicates the start of an even
field. The BLANK signal is optional. When the BLANK input is disabled, the ADV7175/ADV7176 automatically blanks all nor-
mally blank lines as per CCIR-624. Mode 2 is illustrated in Figure 20 (NTSC) and Figure 21 (PAL).
DISPLAY
VERTICAL BLANK
DISPLAY
522 523 524
HSYNC
525
BLANK
VSYNC
1
DISPLAY
2345678
EVEN FIELD ODD FIELD
VERTICAL BLANK
9 10 11
20 21 22
DISPLAY
260 261 262 263 264 265 266 267 268 269 270 271 272 273 274
HSYNC
BLANK
VSYNC
ODD FIELD EVEN FIELD
Figure 20. Timing Mode 2 (NTSC)
283 284 285
–12–
REV. A

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