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Need guidance on Register settings for TVP5150

Other Parts Discussed in Thread: TVP5150, TVP5150AM1

Hi ,

  I am using TVP5150 in a Frame Grabber design. Input provided to TVP5150 is in composite video format. Output is configured to 8-bit 4:2:2 YCbCr. This video is fed to FPGA for YCbCr to RGB conversion and displayed on lcd monitor though VGA.

 

Problem which I am facing in this design is, there is lot of noise viewed on the display. When I select the test pattern in FPGA, there is no such noise found. But when I select the video from TVP5150 noise is included as shown in the picture below.

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Expected output is

 

 

Following are the registers configured in TVP5150

 

Miscellaneous Controls Register(0x03) : 0xAF

Auto-switch Mask Register(0x04) : 0xC0;

Outputs and data rates select(0x0D) : 0x40 ;

Configuration Shared Pins Register(0x0F) : 0x02 ;

Kindly guide me in configuring the device to avoid the noise.

Here is  Schematics for your reference

 

 

Thanks,

Pradeep Reddy