AFE5818: AFE5818 clock input

David Xiang

Part Number: AFE5818
Other Parts Discussed in Thread: CDCLVD1212

Hi ,

We use the AFE5818 and find different descriptions between the date sheet and EVM module for the input clocks as follow?

which is correct and why? Thank you.

over 8 years ago

0 David Xiang over 8 years ago

Prodigy 130 points

BTW, We use the LVDS buffer CDCLVD1212 for clocks input.

0 Olu Sodipe over 8 years ago in reply to David Xiang

TI__Expert 4145 points

Hi David,

I'ld suggest going with the termination recommended on Page 11 of CDCLVD1212's datasheet as shown below;

Note the clocks are AC-coupled as our device is internally biased.

Sincerely,

Olu

0 David Xiang over 8 years ago in reply to Olu Sodipe

Prodigy 130 points

Hi Olu,

Yes,we terminal as your suggestion.But we get atifact image, however, I get good image when remove the 100ohm teimination.I don't konw why. or need any check? Thank you.

0 Olu Sodipe over 8 years ago in reply to David Xiang

TI__Expert 4145 points

Hi David,

When you say you get an artifact image, what does that look like exactly? Can you please share captures/screenshots?

Sincerely,
Olu

0 David Xiang over 8 years ago in reply to Olu Sodipe

Prodigy 130 points

hi Olu,
Thank you for your reply, we have found the root cause.

0 David Xiang over 8 years ago in reply to Olu Sodipe

Prodigy 130 points

Hi Olu,
How to match the input impedence and output impedence between the AFE5818 and T/R switch? Have any formula?
Sincerely ,
David

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AFE5818: AFE5818 clock input