Hi I was programming the SI5340-D Eval board and noticed the output of the eval board doesn't give a nice waveform between 10MHz and 45-ish MHz. Is this output to be expected? Here's a picture from a the output of the signal onto an oscilliscope. Thanks for your time.
Are you using a high impedance termination or probe with the oscilloscope for the clock waveform measurement? It seems a signal integrity (SI) issue, and the signal reflection due to impedance mismatching on the transmission line caused the step-like distortions. You may try to connect a 50 ohm load on the EVB output and then use a high impedance probe, or set 50 ohm termination mode with the oscilloscope, to avoid the SI issue. In your practical design, if you use a CMOS output, you need to consider having a series resistor close to the output pin for source-side impedance matching because a CMOS clock typically drives a high impedance load. More termination information on Si5340 can be found on its datasheet P10-11: https://www.silabs.com/documents/public/data-sheets/Si5341-40-D-DataSheet.pdf
SI5340-D-EVB Output
Hi I was programming the SI5340-D Eval board and noticed the output of the eval board doesn't give a nice waveform between 10MHz and 45-ish MHz. Is this output to be expected? Here's a picture from a the output of the signal onto an oscilliscope. Thanks for your time.