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ADV7511   can not output stable image

Question asked by wwh2008 on Jun 11, 2015
Latest reply on Jun 12, 2015 by GuenterL

I use ADV7511 to output HDMI signal, with 20-bit, Ycbcr. Set the registers accordding to programming guide, and also design the hardware circuit by Hardware guide. The circuit of other parts is simple, with low noise.

Now, the output image has problem:there is a horizontal black bar on the screen, which appears about every half second, from the top to bottom.

I used AD9889 before, but there's no problem. I only change the AD9889 by ADV7511 this time.

Check the reg of 0x42[6],0x9E[4] for many time, and they are no problem.The noise of ADV7511 is lower than before( AD9889). In addition, I test HD and SD signal. They have the same question. I think the SD shouldn't have because of low speed, if the impedance matching is not well.

Here's the photo: