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參數(shù)資料
| 型號： | AD723 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | RGB to NTSC/PAL Encoder with Termination Switch(帶終端開關的RGB-NTSC/PAL編碼器) |
| 中文描述： | RGB到的NTSC / PAL編碼器與終端開關（帶終端開關的RGB-NTSC/PAL編碼器） |
| 文件頁數(shù)： | 1/3頁 |
| 文件大小： | 37K |
| 代理商： | AD723 |
a
RGB to NTSC/PAL Encoder
with Termination Switch
Advanced Datasheet
AD723
One Technology Way,
P.O. Box 9106,
Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
This information applies to a product under development. Its characteristics and specifications are subject
to change without notice. Analog Devices assumes no obligation regarding future manufacture of this
product unless otherwise agreed to in writing.
REV 2
5/5/98
ORDERING GUIDE
Operating
Temperature Range
-40
°
C - +85
°
C
Model
AD723ARS
Package
24 Lead TSSOP
Block Diagram
FEATURES
Composite Video Output: both NTSC and PAL
Chrominance and Luminance (S-Video) Outputs
Triple Switch to Enable RGB Termination
TV-Presence Monitor/Reporting (supports PC98 SIPC)
Y-Trap to Eliminate Cross Color Artifacts
No External Filters or Delay Lines Required
Current Output: 75
Reverse Shunt
Low Power +3V operation
Power Down to <100
μ
A
Compact TSSOP
APPLICATIONS
RGB/VGA to NTSC/PAL Encoding
Personal Computers
Video Games
PRODUCT DESCRIPTION
The AD723 RGB to NTSC/PAL Encoders converts red, green and
blue color component signals into their corresponding luminance
(baseband amplitude) and chrominance (subcarrier amplitude and
phase) signals in accordance with either NTSC or PAL standards.
These two outputs are also combined to provide a composite
video output. All three outputs are available separately and are
optimized for driving 75-ohm reverse-terminated cables.
The AD723 features a logic controlled triple switch which
addresses the applications problem of differing load conditions
when a RGB monitor is disconnected; when a RGB monitor is not
present the R, G and B terminations are enabled by the user. In
addition the AD723 monitors and reports the presence of a TV
load in support of the PC-98 SIPC standard.
The AD723 can be powered-down to only 100 uA of current
consumption for power sensitive applications. In addition the
current-out design of the AD723 eliminates the need for the
physically large 220uF capacitors required by other analog
encoders, supporting the space constraints of portable
applications.
An optional luminance trap (YTRAP) provides a means of
reducing cross color generated by subcarrier frequency
components found in the Y signal.
The AD723 is packaged in a space savings 24 pin TSSOP and
operates from a 3V supply.
NTSC/
PAL
4F SC
RIN
RG ND
G IN
G G N D
BIN
BG N D
G N D
RGB
to
YUV
Encoding
Matrix
Delay
U Modulator
V Modulator
Y TRAP
Y
C V
C
CSYN C
HSYNC/
CS YNC
VSYN C
Y
U
V
TER MINATE
C lock
Generator
Sync/Burst
Generator
DC
CLAM P
G N D
G ND
DC
CL AM P
DC
CL AM P
CH IP
ENAB LE
AG N D
AVD D
Reset 1
Reset 2
Reset 3
TV Direct
DG H D
DVD D
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