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AD723ARU Arkusz danych(PDF) 1 Page - Analog Devices |
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AD723ARU Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 20 page REV. 0 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. a AD723 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 2.7 V to 5.5 V RGB-to-NTSC/PAL Encoder with Load Detect and Input Termination Switch FUNCTIONAL BLOCK DIAGRAM 4-POLE LPF CSYNC Y DC CLAMP 4-POLE LPF LUMINANCE 8FSC CLK LUMA DELAY LINE RIN COMPOSITE LUMA TRAP GND TRIPLE INPUT TERMINATION CURRENT OUTPUT DRIVERS WITH SMART LOAD DETECT Y Y TRAP CV C RT 4-POLE LPF 4-POLE LPF BURST BURST U V DC CLAMP 4FSC HSYNC VSYNC BURST STND CSYNC GIN BIN DC CLAMP BALANCED MODULATORS CHROMINANCE SYNC SEPARATOR RGB-TO-YUV ENCODING MATRIX 4-POLE LPF QUADRATURE DECODER GND GND FSC SIN COS YSET CSET CVSET GAIN SET RESISTORS TV DETECT CE AD723 TERM GT BT FEATURES Low Cost, Fully Integrated Solution for NTSC/PAL Composite and Y/C (S-Video) Outputs Current Output Drives 75 Loads DC-Coupled: Supports TV Load Detect No Large AC-Coupling Capacitors at Output Self-Power-Down of Unloaded Output Drivers Triple Switch to Enable RGB Termination Integrated Delay Line and Auto-Tuned Filters Y-Trap to Eliminate Cross Color Artifacts 3 V Supply Operation: Low Power < 100 mW: Composite Active (Typical) < 150 mW: S-Video Active (Typical) <1 A: Power-Down Current APPLICATIONS TV Out for Personal Computers/Laptops Digital Cameras Set-Top Boxes Video Games Internet Appliances PRODUCT DESCRIPTION The AD723 is a low cost RGB-to-NTSC/PAL encoder that converts analog red, green, and blue color component signals into their corresponding luminance and chrominance signals for display on an NTSC or PAL television. Luminance (Y) and Chrominance (C) signals are available individually for S-video, or combined for composite video (CV). All outputs are avail- able separately and optimized for driving 75 Ω loads. Active termination is used for lower power consumption. A smart load detect feature powers down unused outputs and can be used to monitor the continuing presence or absence of an external TV. This enables plug-and-play operation. In addition, a logic controlled triple switch at the input solves the applica- tions problem of differing load conditions when an RGB monitor is disconnected. When an RGB monitor is not present, the R, G, and B terminations are enabled by the user. This solution ensures no loss of video bandwidth when the RGB monitor is in operation. In PC applications, flicker filter support is provided by the graphics controller, which has direct access to memory. Under- scan compensation, necessary for uses other than video or DVD, is supported through choice of RGB output clocks and sync intervals. An optional luminance trap (YTRAP) provides a means of reducing cross color artifacts due to subcarrier frequency infor- mation in the Y signal. The AD723 is available in a 28-lead TSSOP package and is capable of operation from supplies of 2.7 V to 5.5 V. |
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