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AD721 Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD721 Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 8 page a FUNCTIONAL BLOCK DIAGRAM SYNC DECODER BURST C-SYNC 4FSC ENCD RED GREEN BLUE QUADRATURE DECODER DELAYED C-SYNC SC 90 ° SC 0 ° CLOCK AT 8FSC DC RESTORE AND C-SYNC INSERTION 5MHz 2-POLE LP POST- FILTER COMPOSITE OUTPUT* –0.572V TO 2V NTSC –0.6V TO 2V PAL LUMINANCE OUTPUT* –0.572V TO 1.43V NTSC –0.6V TO 1.4V PAL CHROMINANCE OUTPUT* 572mVp-p NTSC 600mVp-p PAL NTSC/PAL C-SYNC DELAY ±180 ° (PAL ONLY) RGB-TO-YUV ENCODING MATRIX BURST Y U V SC 90 °/270° 5MHz 4-POLE LP PRE-FILTER 1.2MHz 4-POLE LPF 1.2MHz 4-POLE LPF SAMPLED- DATA DELAY LINE ∑ 3.6MHz (NTSC) 4.4MHz (PAL) 3-POLE LPF ∑ X2 X2 X2 POWER AND GROUNDS +5V AGND DGND LOGIC ANALOG ANALOG ONLY ANALOG LOGIC +5V –5V *NOTE: THE LUMINANCE, COMPOSITE, AND CHROMINANCE OUTPUTS ARE AT TWICE NORMAL LEVELS FOR DRIVING 75 Ω REVERSE-TERMINATED LINES. ASNC NTSC/PAL BALANCED MODULATORS NTSC/PAL X2 X2 X2 ROUT 1.5Vp-p GOUT 1.5Vp-p BOUT 1.5Vp-p AD721 (ONLY) NTSC/PAL AD720/AD721 FEATURES Composite Video Output Chrominance and Luminance (S-Video) Outputs No External Filters or Delay Lines Required Drives 75 Ω Reverse-Terminated Loads Compact 28-Pin PLCC Logic Selectable NTSC or PAL Encoding Modes Automatically Selects Proper Chrominance Filter Cutoff Frequency for Encoding Standard Logic Selectable Encode or Power-Down Mode (AD720 Only) Logic Selectable Encode or Bypass Mode (AD721 Only) Low Power: 200 mW typical APPLICATIONS RGB to NTSC or PAL Encoding Drive RGB Signals into 75 Ω Load (AD721 Only) PRODUCT DESCRIPTION The AD720 and AD721 RGB to NTSC/PAL Encoders convert red, green and blue color component signals into their corre- sponding 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 out- puts are available separately at voltages of twice the standard signal levels as required for driving 75 Ω reverse terminated cables. The AD721 also features a bypass mode, in which the RGB inputs may bypass the encoder section of the IC via three gain-of-two amplifiers suitable for driving 75 Ω reverse termi- nated cables. The AD720 and AD721 provide a complete, fully calibrated function, requiring only termination resistors, bypass capacitors, a clock input at four times the subcarrier frequency, and a com- posite sync pulse. There are two control inputs: one input selects the TV standard (NTSC/PAL) and the other (ENCD) powers down most sections of the chip when the encoding func- tion is not in use (AD720) or activates the triple bypass buffer to drive the RGB signals when RGB encoding is not required (AD721). All logical inputs are CMOS compatible. The chip operates from ±5 V supplies. (continued on page 5) RGB to NTSC/PAL Encoders One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 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. OBSOLETE |
Codice articolo simile - AD721_15 |
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Descrizione simile - AD721_15 |
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