SN65LVDS104: Issues using SN65LVDS104 ibis model in Hyperlynx at fast-strong (slow-weak and nominal look OK)

Robert Schaefer2

Part Number: SN65LVDS104

When using the ibis model to simulate the SN65LVDS104 part in our system using HyperLynx, when simulating at fast-strong the output differential CM drops from 1.2V (what we see with slow-weak or nominal) to around 0.82V and the VID amplitude drops more than expected (should be higher with Fast/Strong, not a reflection issue we allow the signal to settle out). This doesn't happen with other TI LVDS ibis models. Is there an issue with the ibis model for this part? Or can we expect this as real world behavior.

over 5 years ago

0 Ikechukwu Anyiam over 5 years ago

TI__Mastermind 35130 points

Hi Robert,

We are reviewing this question and will provide a response early next week.

Regards,

I.K.

0 Ikechukwu Anyiam over 5 years ago

TI__Mastermind 35130 points

Hi Robert,

Can you share your complete setup for your simulation?

Regards,

I.K.

0 Robert Schaefer2 over 5 years ago in reply to Ikechukwu Anyiam

Prodigy 20 points

Hi I.K.,

We are looking at the possibility of providing the setup for the simulations, but I don't think that this would be necessary.

Our team that vets models flagged a few warnings in this model, plus the curves in the model match the description I initially gave (where fast/strong [max] didn't fit relative to the typical or slow/weak [min]). I.e. the fast/strong drives higher and faster, but doesn't drive lower than either slow/weak or typical or fast/strong (in fact, slow/weak also drives lower than typical).

I think if you compare the model to other driver's models you will also see this.

Thanks.

0 Ikechukwu Anyiam over 5 years ago in reply to Robert Schaefer2

TI__Mastermind 35130 points

Hi Robert,

Sorry for the delay in responding. This indeed sounds like an issue with the model as the device should not exhibit this behavior. This will be forwarded to our modeling team for further investigation.

Regards,

I.K.

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SN65LVDS104: Issues using SN65LVDS104 ibis model in Hyperlynx at fast-strong (slow-weak and nominal look OK)