Can ADV8003 accept not crystal but oscillator as XTAL input?
If possible, should I use XTALP pin as oscillator input and remain XTALN pin floating?
And could you tell me the spec(Vil, Vih etc)?
Yes, XTALP should be driven by 1.8V digital clock and XTALN left floating.
I believe it will accept a 1.8V oscillator input on XTALP with XTALN left floating however I will forward this question to the ADV8003 expert to verify.
Thank you for your cooperation.
Would you please tell me your status?
I am still trying to get final confirmation from the chip designers on this.
How about this status?
I appreciate your support.
No answer from the designer yet. I will ask them again what the answer is. Sorry for the delay
From the designer:
For an external input digital clock (not an xtal), the levels should be at least 1.8V VIL/VIH, 0.4V, 1.2V
Thank you for your response.
To make sure, let me confirm again.
-We can use not crystal but oscillator as XTAL input
-XTALP pin ---- VIL=0.4V, VIH=1.2V(1.8V interface)
-XTALN pin ---- Floating
Is that correct?
I understood it.
Thank you for your support.
I face the same problem, but now my external input clock only can be drive by the FPGA or the 3.3V supply oscillator, and the FPGA's clock ouput is also 3.3V TTL; my quetions is: can the 3.3V TTL levels drive the ADV8003's XTALP?
No, it must be 1.8V. either use a level translating buffer or possibly a 150/180 resistor divider network. Also FPGA outputs may have jitter problems when driving video chips. Best to use a crystal or oscilatot
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