I have a problem with Display Interface AD9984A (chip revision 0x00). I use input signal resolution 1600x1200x60Hz.
In normal condition I see more-less sharp test image. Oscillogram and Image from monitor are shown in fig1.jpg and 1600_1200_60_1.bmp respectively.
When I heat a board with AD9984A by foehn I see DATACK drift relatively Hsync (input) and test image become less sharp. Oscillogram and Image from monitor are shown in fig2.jpg and 1600_1200_60_2.bmp respectively. As you can see that DATACK drift is approximately 3 ns.
Could you tell me please, it's a normal situation for AD9984A or I'd made mistake? Thank you.
Oscilliscope configuration (input BW is 200 MHz).
1ch (Orange) - VSYNC(input)
4ch (Green) - HSYNC(input)
2ch (Blue) - DATACK(output)
3ch (Magenta) - HSOUT(output)
Oscilloscope are synchronized from VSYNC.
Current Register Configuration:
Reg# Reg Data