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ADV7343 output level

Question asked by Q-on on May 28, 2015
Latest reply on Jun 2, 2015 by mattp

He,

we use the ADV7343 with the following register settings to generate a progressive picture with 24Bit RGB(0...255) input and RGB output on DAC1-3  Timing / and Picture on the Display look fine so far.

 

0x000x1E
0x010x10
0x020x0
0x300x02
0x310x01
0x330x00
0x340x48
0x350x0A

 

Now, we checked the voltage levels on the Video output DACs.

I measure a blank/black sigal with 300mV at DAC2+3 ( B and R) but have a 40mV Offset ( 340mV) on DAC1 (Green).  The maximum amplitude is a 780mV when all data-inputs are "1". I see registers to adapt the gain of the DACs, but how could I correct this 40mV on one of the DACs, respcetivley what could be the reason for this undesired offset.

 

Best regards

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