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ADV7611 LLC AMPLITUDE REDUCED

Question asked by melisaelzer on Oct 21, 2013
Latest reply on May 1, 2017 by mattp

Hello,

I am probing the LLC test point in the development board and when the program starts I clearly see the 28MHz clock.

When I run the following script: "HDMI_IN_7611_HDMI_OUT_7511" the LLC starts running approximately at 110MHz but the amplitude reduces to about 600mV peak-to-peak (1.2V low, 1.8V high).

 

I probed with a 1" GND and have my scope at peak detect mode, record length 10M in a Tektronics DPO4054 that can read up to 500MHz.

I also set the DR_STR_CLK to 11.

 

- Why is this offset centered at 1.5V?

- why is it such a low amplitude?

- Do I need to change other settings?

 

Thank you,

 

 

Melissa

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