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PDF ADV7175A Data sheet ( Hoja de datos )
| Número de pieza | ADV7175A | |
| Descripción | Digital CCIR-601 to PAL/NTSC Video Encoder | |
| Fabricantes | Analog Devices | |
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a
High Quality, 10-Bit, Digital CCIR-601
to PAL/NTSC Video Encoder
ADV7175A/ADV7176A*
FEATURES
CCIR and Square Pixel Operation
ITU-R BT601/656 YCrCb to PAL/NTSC Video Encoder
High Quality 10-Bit Video DACs
Integral Nonlinearity <1 LSB at 10 Bits
Integrated Subcarrier Locking to External Video Source
Color Signal Control/Burst Signal Control
Interlaced/Noninterlaced Operation
NTSC-M, PAL-M/N, PAL-B/D/G/H/I
Single 27 MHz Clock Required (؋2 Oversampling)
80 dB Video SNR
Complete On-Chip Video Timing Generator
Programmable Multimode Master/Slave Operation
Macrovision Antitaping Rev 7.01 (ADV7175A Only)**
32-Bit Direct Digital Synthesizer for Color Subcarrier
Multistandard Video Output Support:
Composite (CVBS)
Closed Captioning Support
Teletext Insertion Port (PAL-WST)
Onboard Color Bar Generation
Component S-Video (Y/C)
Component YUV and RGB
EuroSCART Output (RGB + CVBS/LUMA)
Onboard Voltage Reference
2-Wire Serial MPU Interface (I2C Compatible)
Single Supply 5 V or 3 V Operation
Video Input Data Port Supports:
Small 44-Lead MQFP Thermally Enhanced Package
CCIR-656 4:2:2 8-Bit Parallel Input Format
4:2:2 16-Bit Parallel Input Format
Full Video Output Drive or Low Signal Drive Capability
34.7 mA max into 37.5 ⍀ (Doubly-Terminated 75R)
5 mA min with External Buffers
APPLICATIONS
MPEG-1 and MPEG-2 Video, DVD, Digital Satellite/
Cable Systems (Set Top Boxes/IRDs), Digital TVs,
CD Video/Karaoke, Video Games, PC Video/Multimedia
Programmable Simultaneous Composite
and S-Video Y/C or RGB (SCART)/YUV Video Outputs
Programmable Luma Filters (Low-Pass/Notch/Extended)
Programmable VBI (Vertical Blanking Interval)
Programmable Subcarrier Frequency and Phase
Programmable LUMA Delay
Individual ON/OFF Control of Each DAC
GENERAL DESCRIPTION
The ADV7175A/ADV7176A 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
(Continued on page 11)
FUNCTIONAL BLOCK DIAGRAM
TTX
TTXREQ
VAA
COLOR
DATA
P7–P0
P15–P8
HSYNC
FIELD/VSYNC
BLANK
TELETEXT
INSERTION
BLOCK
8
4:2:2 TO 8
4:4:4
INTER-
POLATOR
8
YCrCb
TO
YUV
MATRIX
VIDEO TIMING
GENERATOR
8
8
ADD
INTER-
8
Y
LOW-PASS
SYNC
POLATOR
FILTER
YUV TO
RBG
MATRIX
10
M
U
L
10
T
I
P 10
L
E
X 10
E
R
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
8
ADD 8
INTER-
8
U 10
LOW-PASS
BURST
POLATOR
FILTER
8 ADD 8
BURST
INTER- 8
POLATOR
V 10
LOW-PASS
FILTER
10 10-BIT
DAC
ADV7175A/ADV7176A
I2C MPU PORT
REAL-TIME
CONTROL
CIRCUIT
10 10
SIN/COS
DDS BLOCK
VOLTAGE
REFERENCE
CIRCUIT
DAC D (PIN 27)
DAC C (PIN 26)
DAC B (PIN 31)
DAC A (PIN 32)
VREF
RSET
COMP
CLOCK RESET SCLOCK SDATA ALSB
SCRESET/RTC
GND
The Macrovision anticopy process is
licensed for noncommercial home use only, which is its sole intended use in the device. Please contact sales office for latest Macrovision version available.
NOTE: ITU-R and CCIR are used interchangeably in this document (ITU-R has replaced CCIR recommendations).
REV. C
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000
1 page  
ADV7175A/ADV7176A
3.3 V DYNAMIC SPECIFICATIONS1 (VAA = 3.0 V–3.6 V1, VREF = 1.235 V, RSET = 300 ⍀. All specifications TMIN to TMAX2
unless otherwise noted.)
Parameter
Conditions1
Min Typ Max
Unit
Filter Characteristics
Luma Bandwidth3 (Low-Pass Filter)
Stopband Cutoff
Passband Cutoff F3 dB
Chroma Bandwidth
Stopband Cutoff
Passband Cutoff F3 dB
Luma Bandwidth3 (Low-Pass Filter)
Stopband Cutoff
Passband Cutoff F3 dB
Chroma Bandwidth
Stopband Cutoff
Passband Cutoff F3 dB
Differential Gain4
Differential Phase4
SNR4 (Pedestal)
SNR4 (Pedestal)
SNR4 (Ramp)
SNR4 (Ramp)
Hue Accuracy4
Color Saturation Accuracy4
Luminance Nonlinearity4
Chroma AM Noise4
Chroma PM Noise4
Chroma AM Noise4
Chroma PM Noise4
NTSC Mode
>54 dB Attenuation
>3 dB Attenuation
NTSC Mode
>40 dB Attenuation
>3 dB Attenuation
PAL Mode
>50 dB Attenuation
>3 dB Attenuation
PAL Mode
>40 dB Attenuation
>3 dB Attenuation
Normal Power Mode
Normal Power Mode
RMS
Peak Periodic
RMS
Peak Periodic
NTSC
NTSC
PAL
PAL
7.0
4.2
3.2
2.0
7.4
5.0
4.0
2.4
0.7
0.5
75
68
58
56
1.0
1.2
1.1
67
63
64
63
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
%
Degree
dB rms
dB p-p
dB rms
dB p-p
Degree
%
±%
dB
dB
dB
dB
NOTES
1The max/min specifications are guaranteed over this range. The max/min values are typical over 3.0 V to 3.6 V.
2Temperature range TMIN to TMAX: 0°C to 70°C.
3These specifications are for the low-pass filter only and guaranteed by design. For other internal filters, see Figure 4.
4Guaranteed by characterization.
Specifications subject to change without notice.
REV. C
–5–
5 Page 
ADV7175A/ADV7176A
(Continued from page 1)
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 Ω
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 24.5454 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 (I2C 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 MQFP 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 pos-
sible 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 appropri-
ate SYNC, BLANK and Burst levels are added to the YCrCb
data. Macrovision antitaping (ADV7175A only), closed caption-
ing 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.
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
CUTOFF (MHz) RIPPLE (dB) CUTOFF (MHz)
2.3 0.026
3.4 0.098
1.0 0.085
1.4 0.107
4.0 0.150
2.3 0.054
3.4 0.106
7.0
7.3
3.57
4.43
7.5
7.0
7.3
STOPBAND
ATTENUATION (dB)
>54
>50
>27.6
>29.3
>40
>54
>50.3
F3dB
4.2
5.0
2.1
2.7
5.65
4.2
5.0
Figure 4. Luminance Internal Filter Specifications
FILTER SELECTION
NTSC
PAL
REV. C
PASSBAND
CUTOFF (MHz)
1.0
1.3
PASSBAND
RIPPLE (dB)
0.085
0.04
STOPBAND
CUTOFF (MHz)
3.2
4.0
STOPBAND
ATTENUATION (dB)
>40
>40
ATTENUATION @
1.3MHz (dB)
0.3
0.02
F3dB
2.05
2.45
Figure 5. Chrominance Internal Filter Specifications
–11–
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADV7175A.PDF ] | |
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