Hello E2E design support team,
The below is the waveform taken at the LMK00105 CLKin pin for existing product.
This shows that the CLKin level exceeds the specified range (0.3Vpp < Vi_se < 2Vpp).
Waveform indicates 2.0856V (ampl) and 2.2163V (pk-pk).
The input signal is terminated with 75-ohm and AC coupled into CLKin.
The 75-ohm explains the high signal amplitude.
Moving forward, I can replace termination with 50 ohm (matching source, line and termination impedance).
Q1. What is the absolute maximum voltage for CLKin? Does it correspond to datasheet Vin specified at -0.3 to Vdd+0.3 V.
We supply Vdd with 3.3V.
Q2. Any reliability and performance concerns with the Vi_se amplitude exceeding 2V as shown above?
I can adjust for the new product, but want to determine if anything needs to be done for the existing product.
I understand the nature of my questions (i.e. out-of-range input operation), but would greatly appreciate your feedback on these.
Thanks for your support.
Regards,
JP