Hi Ryuji-san,
Thanks for posting! This is an interesting question. There are important factors to consider if you use the DS32EV100 with an input LVDS signal, as the device is developed for CML in/out use.
LVDS signals rely on a 100-Ohm termination at the output to terminate the transmission line and close the circuit, as shown in the app note LVDS to CML (http://www.ti.com.cn/cn/lit/an/scaa059c/scaa059c.pdf) diagram below:
Now, when looking at this LVDS to CML conversion figure, there are three things to note:
1) AC Coupling is required, in order to prevent DC drifting. Since you are using LVDS, AC coupling is also important to prevent against competition between two different common-mode voltages due to the difference between LVDS and CML.
2) There must either be a 100-Ohm termination at the output of the LVDS driver or the input of the CML receiver, otherwise LVDS signaling will not work. In this case, CML receiver possesses the 100-Ohm termination.
3) The 10kOhm can be omitted if the CML receiver inputs are internally biased.
Now, looking at the input termination circuit for the DS32EV100, we see the following:
The 100-Ohm input termination across IN+/- is present as well as the terminal biasing with 10kOhm pull-ups to VDD. All that is left is to provide the appropriate AC coupling, and theoretically the DS32EV100 should work with LVDS.
With all this having been said though, is there a particular reason why you require the DS32EV100 to handle an LVDS input? If the rest of your system runs LVDS signaling, then there is not much use in having a CML equalizer. Given an LVDS signal, I think the DS25BR110 equalizer may be a better fit for you.
Could you share with us with some additional details of the system so we can find the best part for you:
- Data rate
- Media/Cables at the input/output
- Schematic/Layout(s)
Thanks,
Michael
