I'm running the AD9910 standalone, so I am looping the LVDS SYNC_OUT signals to the SYNC_IN inputs.
Does this require a 100 Ohm LVDS termination resistor?
We should have included that information in the pin out description to make it easier for the user to find. Page 45 (left column, 2nd paragraph) of the data sheet states there's a 100 ohm internal resistor. Probably the intend of R66 was to experiment with double termination, not sure otherwise.
There should be an internal 100 ohms across the SYNC_IN and SYNC_INB pins. So, you do not need an external 100ohm resistor.
Thanks for the reply.
Are you saying that the AD9910 has an internal 100 ohm termination built into the chip?
I thought that might be the case, but then I saw R66 on the AD9910 eval board. It is an external 100 Ohm
termination. If the AD9910 has an internal 100 Ohm termination, then why the presence of R66?
My apologies for not completely RingTFM (RTFMing?) the data sheet.
There are 3 full pages of multiple device synchronization, and I read them like this:
"Blah blah blah leading edge..."
"Blah blah blah validation block..."
So I missed that 1 sentence paragraph.
I agree, perhaps Table 3 is the place for this information.
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