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ADV7619 noise/streaks in 4k RGB

Question asked by Arjibi on Jun 10, 2015
Latest reply on Nov 4, 2015 by mattp

Our product uses the ADV7619.  For the picture below, the source signal is from a Quantum generator, 3840x2160, 30hz, ramp pattern.

Intermittently, the 7619 shows noise/streaks, usually for the red pixels.  To clear the noise, we switch the input timing to a HD rate (162 Mhz or less) and then back to 3840x2160, 30 Hz.  For example:

- set Quantum to 1080p30

- reprogram 7619 to process HD rate timing

- set Quantum to 3840x2160, 30

- reprogram 7619 to process 4k

- the ramp no longer shows the noise/streaks


We followed the settings in app note RecSettings_1-2-120802011.pdf.

We would very much like to avoid these streaks.  Any suggestions would be appreciated.