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discussion of ADV7441A HDMI input AC coupler application and issue

Question asked by WilliamLian Employee on Jan 7, 2016
Latest reply on Jan 28, 2016 by DominicB

     Even ADV7441 datasheet desn't mentioned whether support AC coupler,  this part actually be used in AC coupler way in a customer, the schematic is as below (BTW, I have got a reference document named "HDMI RX AC coupling solution06062014", it mentioend the AC coupler is supported but the schematic is a bit complex than customer's design, and the AC coupler capactor is different, ADI's recommendation is 100nF, customer use 10nF),  the test result showed that output is unstable.

     To fix this issue, cusomer modify the User Map2 0xF0, 0xF1,0xF2 value from 0x10, 0x0f, 0x20 to 0x30, 0x0f, 0xA0, the output become stable.

     Customer want to ADI help to confirm whether their register modification make sense to fix the issue?