Part Number:LMK03328
Hi Team,
This is my question divided from former post.
1.8V LVCMOS connection between LMK03328 output and LMK00105 input.
https://e2e.ti.com/support/clocks/f/48/t/664966
Below is the characteristics for 1.8V LVCMOS output for LMK03328.
Q1). Do you only guarantee the device operation only with source 50 ohms termination ?
Electrical characteristic specifies VOH(MIN)=1.35V with the condition of VIH=-1mA.
I believe that when there is load over 1mA, VOH (MIN) would decrease.
Q2). In the above former post, I had the answer that 50 ohms termination could be applied if there is DC blocking capacitor. Is this true ?
Even if there is a DC blocking capacitor, there should be AC current flowing from the LMK03328 output to 50 ohms termination.
Q3). In the application where they have long trace, for example, connection between LMK03328 output and LMK00105 input is 0.5m.
How should the user use the device ? What would be the recommended schematic ?
- Since the tr/tf is so fast for LVCMOS interface, end termination may be required when there is a long trace more than 0.075m.
- There is a parasitic capacitance in the LVCMOS input circuit and this capacitance could introduce dip when the voltage is rising.
Best Regards,
Kawai