DS90UB953-Q1: DS90UB953TRHBTQ1

Hi Ray,

In the DS90UB954 D/S, on page 153, section 10.1.2

"Route the RIN+ trace between the AC-coupling capacitor and the FAKRA connector as a 50-Ω single-ended
micro-strip with tight impedance control (±10%). Calculate the proper width of the trace for a 50-Ω impedance
based on the PCB stack-up. Ensure that the trace can carry the PoC current for the maximum load presented
by the remote sensor module"

Hi 

    Thank you for the info.

We know the trace between fakra and ac cap is 50 ohm single ended.

We are not sure if the trace between 954 IC pin and ac cap is 50 ohm single ended too.

And It seems to be 100 ohm differential pair even if we use coaxial(fakra) POC solution.

We have the same problem on 953 side too.

Ray

Hi Ray,

From the IC pin to the ac cap, it should be 100 ohm differential

Thanks,
Sally