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AD725ARZ 데이터시트(PDF) 1 Page - Analog Devices |
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AD725ARZ 데이터시트(HTML) 1 Page - Analog Devices |
1 / 20 page a Low Cost RGB to NTSC/PAL Encoder with Luma Trap Port AD725 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., 1997 FEATURES Composite Video Output: Both NTSC and PAL Chrominance and Luminance (S-Video) Outputs Luma Trap Port to Eliminate Cross Color Artifacts TTL Logic Levels Integrated Delay Line and Auto-Tuned Filters Drives 75 Reverse-Terminated Loads Low Power +5 V Operation Power-Down to <1 A Very Low Cost APPLICATIONS RGB/VGA to NTSC/PAL Encoding Personal Computers/Network Computers Video Games Video Conference Cameras Digital Still Cameras PRODUCT DESCRIPTION The AD725 is a very low cost general purpose RGB to NTSC/ PAL encoder that converts red, green and blue color compo- nent 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 on-chip to provide a composite video output. All three outputs are available sepa- rately at voltages of twice the standard signal levels as re- quired for driving 75 Ω, reverse-terminated cables. The AD725 features a luminance trap (YTRAP) pin that pro- vides a means of reducing cross color generated by subcarrier frequency components found in the luminance signal. For por- table or other power-sensitive applications, the device can be powered down to less than 1 µA of current consumption. All logic levels are TTL compatible thus supporting the logic re- quirements of 3 V CMOS systems. The AD725 is packaged in a low cost 16-lead SOIC and oper- ates from a +5 V supply. FUNCTIONAL BLOCK DIAGRAM 4FSC NTSC/PAL HSYNC VSYNC BURST NTSC/PAL FSC 90 C FSC 0 C 4FSC FSC 90 C/270 C CSYNC CSYNC RED GREEN BLUE CSYNC Y U V BALANCED MODULATORS NTSC/PAL X2 X2 X2 LUMINANCE OUTPUT COMPOSITE OUTPUT CHROMINANCE OUTPUT CLOCK AT 8FSC SYNC SEPARATOR QUADRATURE +4 DECODER BURST 3-POLE LP PRE- FILTER 4-POLE LPF 4-POLE LPF 180 C (PAL ONLY) RGB-TO-YUV ENCODING MATRIX SAMPLED- DATA DELAY LINE 4-POLE LPF 2-POLE LP POST- FILTER LUMINANCE TRAP 4FSC CLOCK V CLAMP U CLAMP DC CLAMP DC CLAMP DC CLAMP XNOR 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. |
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