• 关于AD9949

    AD9949的自测模式怎么使用?怎么判断AD9949是否处于正常工作状态?

  • RE: AD9949 - VDD

    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
  • 关于AD9949同步时钟的问题

    AD9949的上电顺序是先上时钟CLI,VD(垂直同步时钟),HD(水平同步时钟)。那这个VDHD的信号时序有什么要求呢?包括两个信号下降沿和上升沿代表的含义,然后配置这两个信号的要点又是什么?输出信号是在寄存器配置完给了 VDHD以后才有,那在那之前前面一段的CCD信号输入就没有输出吗?另外问一下ODD FIELD和EVEN FIELD的实现方式。我们那款CCD芯片用的就是这个奇偶场

     

  • 我心中的ADI年度贺岁片——CCD信号处理器AD9949助我完成毕业设计

    我心中的ADI年度贺岁片——CCD信号处理器AD9949助我完成毕业设计 by HUA

        AD9949是一款CCD信号处理芯片,是的,我的毕业设计是完成图像采集。为角膜地形图仪的图像采集部分做知识储备。该设备主要应用于医院,采集人眼的表面形貌信息,为近视眼患者配置一种硬性隐形眼镜。图像采集,当然也包括视频了,用到的主流传感器是,CMOS图像传感器和CCD图像传感器。相对了CMOS图像传感器来说,CCD有着它先天的优势,比如,高像素、高灵敏度、低暗电流等特点,适合于对图像质量要求比较高的一些应用场合…

  • Would I be able to use AD9944&AD9949 by a frequency of 3-6MHz?

    Hello, advice for me, please.

    It's a question in the reach of the practicable clock frequency by AD9944 & AD9949.

    Would I be able to use AD9944 & AD9949 by a frequency of 3-6MHz?

  • AD9949

    In the Analog Device chip AD9949 there are sampling clocks called SHP/SHD set in one register.

    These clocks are used to program the dark and white sampling of the analog video signal.

    We have set  SHD values lower than SHP values and it seems to work…

  • 两个有关AD9949内部模数转换的问题

    问题一:AD9949内部的12高性能位ADC是什么类型的,如逐次逼近型、Sigma-Delta型等;

    问题二:AD9949中提到了很多的增益调整,我有点搞晕了,比如我的输入信号是1Vp-p,经过了1.5V的直流偏压,那么我在CDS的增益可设为0dB,在PxGA增益为0dB,VGA的增益是6-42dB,至少是6dB,为什么是至少呢?不是增益大于6dB时信号会大于2Vp-p吗?那么信号到了12ADC时,2V参考电压,岂不是超过了参考电压范围,这样ADC的分辨率还会最好吗?还有前面的1.5V直流偏压哪去了…

  • AD9949 don't have signals at outputs H1-H4.

    Hello everyone.

    I use AD9949. But I can't see signals at outputs H1-H4. DOUTs  are presented. I use recommended power-up sequence (see page 25 in datasheet), but I have written next registers values:

    reg# => val

    0x12 => 0x00

    0x12 => 0x01…

  • How to get fixed DOUT from AD9949

    Hi,

    I have a design using AD9949 connected with a FPGA, the Fpga is used to set up the AD9949 registers and provide CLI, VD and HD.The DOUT from AD9949 are sent back to Fpga.

    I want to write a piece of FPGA selftest code to validate the connection…

  • 我心中的ADI年度贺岁片——CCD信号处理器AD9949助我完成毕业设计

        AD9949是一款CCD信号处理芯片,是的,我的毕业设计是完成图像采集。为角膜地形图仪的图像采集部分做知识储备。该设备主要应用于医院,采集人眼的表面形貌信息,为近视眼患者配置一种硬性隐形眼镜。图像采集,当然也包括视频了,用到的主流传感器是,CMOS图像传感器和CCD图像传感器。相对了CMOS图像传感器来说,CCD有着它先天的优势,比如,高像素、高灵敏度、低暗电流等特点,适合于对图像质量要求比较高的一些应用场合。CCD输出的信号是模拟信号,需要通过ADC把模拟信号转换为计算机能识别的数字信号。通过对AD9949数据手册的学习…