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AD724JRZ-RL
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AD724JRZ-RL

  • Category:Analog switch
  • Product Name:RGB to NTSC/PAL encoder
  • Manufacturers:Analog Devices
  • Production Batch Number:15+
  • Encapsulation:16 ld SOIC -
  • Stock Status:There is stock
  • Stock Quantity:3230
  • Minimum order quantity: 1
  • Details:点击查找AD724JRZ-RL的pdf资料
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  • Product introduction

Advantages and features

  • 低成本集成解决方案
  • +5 V power supply
  • 接受FSC时钟、晶振或4 FSC时钟
  • 只需极少的外部元件:
    无需外部滤波器或延迟线
    片上直流箝位
    接受HSYNC与VSYNC或CSYNC
  • 复合视频和独立Y/C(S-视频)输出
  • 亮度和色度输出具有时序一致性
  • 相位锁定至外部副载波
  • Drives 75 Ω reverse terminated load
  • 逻辑可选的NTSC或PAL编码模式
  • 紧凑的16引脚SOIC封装

Product details

AD724是一款低成本RGB转NTSC/PAL编码器,可将红色、绿色和蓝色分量信号转换为符合NTSC或PAL标准的相应亮度(基带振幅)和色度(副载波振幅与相位)信号。同时,这两路输出合并以提供复合视频输出。所有三路输出可以同时驱动75 Ω、反向端接电缆。所有逻辑输入均为CMOS兼容型。该芯片采用+5 V单电源供电;无需外部延迟线或滤波器。不使用时,该器件可以关断。

AD724接受FSC或4FSC时钟。当无时钟可用时,一个低成本并行谐振晶体(3.58 MHz (NTSC)或4.43 MHz (PAL))与该器件的片内振荡器一起可产生必要的副载波时钟。AD724还接受外部视频源提供的副载波时钟。

与图形控制器的接口十分简单:片内逻辑“XNOR”接受可用的垂直同步(VSYNC)和水平同步(HSYNC)信号,并在片内生成复合同步(CSYNC)信号。如果可用,AD724也能接受标准CSYNC信号,方法是将VSYNC与+5 V相连,并将CSYNC施加于HSYNC引脚。该器件内置解码逻辑,可识别有效的水平同步脉冲,以便正确插入突发脉冲。

U和V两种色度滤波器的延迟由Y信号路径中的片内采样数据延迟线匹配。为防止混叠,该延迟线之前接一个5 MHz前置滤波器,之后接一个5 MHz后置滤波器,以便抑制输出中的谐波。这些低通滤波器经过优化,脉冲过冲极小。整体亮度延迟相对于色度具有时序一致性,可直接输入电视基带中。AD724采用节省空间的SOIC封装,额定温度范围为0°C至+70°C商用温度范围。

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