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925/928 issue

Patrick Chen
Mastermind 8875 points
Other Parts Discussed in Thread: DS90UB928Q-Q1

Hello,

           Customer  found something abnormal, below is LVDS spec. of 928, the Vodp-p should be 900mV, it only meet the spec. when no resistor on the P and N signal trace, you can see the plots as below. When  mount 100 ohms between P and N, the Vodp-p will drop to 400 mV, there is no LCD panel on the above test. Could you help to double check the design of 925 and 928 and provide comments? Thank you. 

Thanks.

Patrick