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AD720 Folha de dados(PDF) 6 Page - Analog Devices |
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AD720 Folha de dados(HTML) 6 Page - Analog Devices |
6 / 8 page REV. 0 –6– AD720/AD721 The filtered output is summed with the luminance signal to cre- ate a composite video signal. The separate luminance, chromi- nance, and composite video signals are amplified by gain-of-two amplifiers for driving 75 Ω reverse-terminated lines. The sepa- rate luminance and chrominance outputs together are known as “S-Video.” The digital section of the AD720/AD721 is clocked by the 4FSC input. It measures the width of pulses in the composite sync input to separate vertical, horizontal, and serration pulses and to insert the subcarrier burst only after a valid horizontal sync pulse. Asserting the ENCD pin to a logical low routes the AD721’s RGB inputs through three gain-of-two bypass buffers for driving 75 Ω reverse-terminated lines, bypassing the encoder section of the AD721. The triple bypass amplifier is utilized to overcome the loading effects of a “TV-out” connection on the RGB moni- tor output. When a video encoder is connected to outputs of a current-out video RAMDAC or VGA controller, the R, G, and B signals to the monitor are loaded-down. This requires the use of a gain block to properly drive the monitor. 0.1 µF 4 3 2 1 28 27 26 18 17 16 15 14 13 12 11 10 9 8 6 7 5 19 25 24 23 22 21 20 AGND VNEG SYNC DPOS 4FSC DPOS ASNC DGND ENCD RDIN AGND GRIN AGND BLIN STND AGND VNEG DGND AD720 CHROMINANCE OUTPUT COMPOSITE OUTPUT LUMINANCE OUTPUT 75 Ω 75 Ω 75 Ω RGB TO NTSC/PAL ENCODER 0.1 µF 0.1 µF 0.1 µF 0.1 µF 0.1 µF –5V FROM ANALOG SUPPLY COMPOSITE SYNC INPUT CMOS LOGIC LEVEL NEGATIVE SYNC TIPS +5V FROM DIGITAL SUPPLY +5V FROM DIGITAL SUPPLY 4 X SUBCARRIER INPUT CMOS LOGIC LEVELS NTCS = 14.318 180MHz PAL = 17.734 480MHz ENCODE INPUT ENCODE = CMOS HIGH POWER DOWN = CMOS LOW VIDEO STANDARD SELECTION INPUT NTSC = CMOS HIGH PAL = CMOS LOW +5V FROM ANALOG SUPPLY +5V FROM ANALOG SUPPLY –5V FROM ANALOG SUPPLY 75 Ω 75 Ω 75 Ω VIDEO RAM-DAC ADV47X ADV71XX IOR IOG IOB 75 Ω 75 Ω 75 Ω Figure 9. AD720 Application +5V FROM ANALOG SUPPLY 0.1 µF 0.1 µF –5V FROM ANALOG SUPPLY BLUE OUTPUT GREEN OUTPUT RED OUTPUT 75 Ω 75 Ω 75 Ω 4 3 2 1 28 27 26 18 17 16 15 14 13 12 11 10 9 8 6 7 5 19 25 24 23 22 21 20 AGND VNEG SYNC DPOS 4FSC DPOS ASNC DGND ENCD RDIN AGND GRIN AGND BLIN STND AGND VNEG DGND AD721 CHROMINANCE OUTPUT COMPOSITE OUTPUT LUMINANCE OUTPUT 75 Ω 75 Ω 75 Ω RGB TO NTSC/PAL ENCODER 0.1 µF 0.1 µF 0.1 µF 0.1 µF –5V FROM ANALOG SUPPLY COMPOSITE SYNC INPUT CMOS LOGIC LEVEL NEGATIVE SYNC TIPS +5V FROM DIGITAL SUPPLY +5V FROM DIGITAL SUPPLY 4 X SUBCARRIER INPUT CMOS LOGIC LEVELS NTCS = 14.318 180MHz PAL = 17.734 480MHz ENCODE INPUT ENCODE = CMOS HIGH BYPASS = CMOS LOW VIDEO STANDARD SELECTION INPUT NTSC = CMOS HIGH PAL = CMOS LOW +5V FROM ANALOG SUPPLY 75 Ω 75 Ω 75 Ω VIDEO RAM-DAC ADV47X ADV71XX IOR IOG IOB 75 Ω 75 Ω 75 Ω Figure 10. AD721 Application OBSOLETE |
Nº de peça semelhante - AD720_15 |
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Descrição semelhante - AD720_15 |
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