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AD724JR-16-REEL PDF预览

AD724JR-16-REEL

更新时间: 2024-11-23 20:33:43
品牌 Logo 应用领域
亚德诺 - ADI 编码器光电二极管商用集成电路
页数 文件大小 规格书
15页 209K
描述
IC COLOR SIGNAL ENCODER, PDSO16, SOIC-16, Color Signal Converter

AD724JR-16-REEL 数据手册

 浏览型号AD724JR-16-REEL的Datasheet PDF文件第2页浏览型号AD724JR-16-REEL的Datasheet PDF文件第3页浏览型号AD724JR-16-REEL的Datasheet PDF文件第4页浏览型号AD724JR-16-REEL的Datasheet PDF文件第5页浏览型号AD724JR-16-REEL的Datasheet PDF文件第6页浏览型号AD724JR-16-REEL的Datasheet PDF文件第7页 
a
RGB to NTSC/PAL Encoder  
AD724  
FEATURES  
Low Cost, Integrated Solution  
+5 V Operation  
operates from a single +5 V supply. No external delay lines or  
filters are required. The AD724 may be powered down when  
not in use.  
Accepts FSC Clock or Crystal, or 4FSC Clock  
Composite Video and Separate Y/C (S-Video) Outputs  
Luma and Chroma Outputs Are Time Aligned  
Minimal External Components:  
No External Filters or Delay Lines Required  
Onboard DC Clamp  
The AD724 accepts either FSC or 4FSC clock. When a clock is  
not available, a low cost parallel-resonant crystal (3.58 MHz  
(NTSC) or 4.43 MHz (PAL)) and the AD724’s on-chip oscilla-  
tor generate the necessary subcarrier clock. The AD724 also  
accepts the subcarrier clock from an external video source.  
The interface to graphics controllers is simple: an on-chip logic  
“XNOR” accepts the available vertical (VSYNC) and horizon-  
tal sync (HSYNC) signals and creates the composite sync  
(CSYNC) signal on-chip. If available, the AD724 will also  
accept a standard CSYNC signal by connecting VSYNC to  
Logic HI and applying CSYNC to the HSYNC pin. The  
AD724 contains decoding logic to identify valid horizontal sync  
pulses for correct burst insertion.  
Accepts Either HSYNC and VSYNC or CSYNC  
Phase Lock to External Subcarrier  
Drives 75 Reverse-Terminated Loads  
Logic Selectable NTSC or PAL Encoding Modes  
Compact 16-Lead SOIC  
APPLICATIONS  
RGB to NTSC or PAL Encoding  
Delays in the U and V chroma filters are matched by an on-chip  
sampled-data delay line in the Y signal path. To prevent alias-  
ing, a prefilter at 5 MHz is included ahead of the delay line and  
a post-filter at 5 MHz is added after the delay line to suppress  
harmonics in the output. These low-pass filters are optimized  
for minimum pulse overshoot. The overall luma delay, relative  
to chroma, has been designed to be time aligned for direct input to  
a television’s baseband. The AD724 comes in a space-saving  
SOIC and is specified for the 0°C to +70°C commercial tem-  
perature range.  
PRODUCT DESCRIPTION  
The AD724 is a low cost RGB to NTSC/PAL Encoder that  
converts red, green and blue color component signals into their  
corresponding luminance (baseband amplitude) and chromi-  
nance (subcarrier amplitude and phase) signals in accordance  
with either NTSC or PAL standards. These two outputs are also  
combined to provide composite video output. All three outputs can  
simultaneously drive 75 , reverse-terminated cables. All logi-  
cal inputs are TTL, 3 V and 5 V CMOS compatible. The chip  
FUNCTIONAL BLOCK DIAGRAM  
PHASE  
DETECTOR  
FSC  
LOOP  
FILTER  
4FSC  
VCO  
CHARGE  
PUMP  
SUB-  
CARRIER  
XOSC  
SYNC  
4FSC  
4FSC  
FSC  
CSYNC  
BURST  
NTSC/PAL  
HSYNC  
SEPARATOR  
NTSC/PAL  
XNOR  
VSYNC  
CSYNC  
±180°  
(PAL ONLY)  
SC 90°/270°  
FSC 90  
FSC 0  
°
QUADRATURE  
+4  
DECODER  
4FSC  
°
CLOCK  
AT 8FSC  
CSYNC  
2-POLE  
LP POST-  
FILTER  
3-POLE  
LP PRE-  
FILTER  
SAMPLED-  
DATA  
DELAY LINE  
Y
U
V
DC  
CLAMP  
LUMINANCE  
OUTPUT  
X2  
X2  
X2  
RED  
GREEN  
BLUE  
COMPOSITE  
OUTPUT  
NTSC/PAL  
RGB-TO-YUV  
ENCODING  
MATRIX  
DC  
CLAMP  
4-POLE  
LPF  
U
CLAMP  
4-POLE  
LPF  
BALANCED  
MODULATORS  
CHROMINANCE  
OUTPUT  
DC  
CLAMP  
4-POLE  
LPF  
V
CLAMP  
BURST  
REV. B  
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  
Fax: 781/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1999  

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