ADI ADV7202视频CODEC解决方案

       ADI的ADV7202同时取样的视频速率CODEC ADV7202能同时取样多达5个TSC/PAL/SECAM 视频IP信号,前端数字化的分辨率为12位,数字化的转换速率高达54MHz,有多达8个辅助输入;

       后端包括四个可工作在200MHz的10位DAC,可输出CVBS, S-Video, 分量YCrCb和RGB,可广泛应用在画中画视频系统,视频同时处理,混合机顶盒TV系统,直接数字合成/I-Q解调以及图像处理等.本文介绍了ADV7202的主要性能,方框图以及应用电路图和评估板的详细电路图.

       Simultaneous Sampling Video Rate Codec ADV7202
The ADV7202 is a video rate sampling codec. It has the capability of sampling up to five TSC/PAL/SECAM video I/P signals. The resolution on the front end digitizer is 12 bits; 2 bits (12 dB) are used for gain and offset adjustment. The digitizer has a conversion rate of up to 54 MHz. The ADV7202 can have up to eight auxiliary inputs that can be sampled by an 843 kHz SAR ADC for system monitoring.
The back end consists of four 10-bit DACs that run at up to 200 MHz and can be used to output CVBS, S-Video, Component YCrCb, and RGB.
This codec also supports Picture-on-Picture. The ADV7202 can operate at 3.3 V or 5 V. Its monolithic CMOS construction ensures greater functionality with lower power dissipation.

The ADV7202 is packaged in a small 64-lead LQFP package.

       主要特性:

Four 10-Bit Video DACs (4:2:2, YCrCb, RGB I/P Supported)
10-Bit Video Rate Digitization at up to 54 MHz
AGC Control (_6 dB)
Front End 3-Channel Clamp Control
Up to Five CVBS Input Channels, Two Component YUV,Three S-Video, or a Combination of the Above. Simultaneous
Digitization of Two CVBS Input Channels
Aux 8-Bit SAR ADC @ 843 kHz Sampling Giving up to Eight General-Purpose Inputs
I2C Compatible Interface with I2C Filter
RGB Inputs for Picture-on-Picture of the RGB DACs
Optional Internal Reference
Power Save Mode

       应用:
Picture-on-Picture Video Systems
Simultaneous Video Rate Processing
Hybrid Set-Top Box TV Systems
Direct Digital Synthesis/I-Q Demodulation
Image Processing

                                                 图1. ADV7202方框图.



                                                        图2. ADV7202应用电路图

       详细性能请见
        http://www.analog.com/UploadedFiles/Data_Sheets/ADV7202.pdf
       ADV7202 视频速率CODEC评估板Eval-ADV7202EB REVA

                               图3. 评估板Eval-ADV7202EB REVA电路图(1)

                           图4. 评估板Eval-ADV7202EB REVA电路图(2)

      评估板性能请见:

     http://www.analog.com/UploadedFiles/Evaluation_Boards/Tools/210911955ADV7202EB_a.pdf

本文来源：ADI     作者：

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