I’m building clock distribution system with four DWM3000 modules.
Trying leverage ideas decribed in
Clock distribution issues - #5 by mciholas related DW1000 device.
The DWM3000 module does not have external clock input and I did some rework on module, removing original XTAL and caps and connecting external clock directly to XTI H15 ball through 2200pF series capacitor.
Please see full setup diagram attached.
DW3000 Clock Distribution.pdf (299.2 KB)
We didn’t test the system yet and asking your review based on scematics and oscopes shots included.
Do you see anything wrong - clock signal quality and swing at H15 ball and G14 output?
I started to power PL135-47OC from 1.8V LDO to reduce swing of output clock, but found quality of clock across all clock distribution path worse compared with 2.5V LDO I used.
Is any restriction on DW3000 XTI clock level as it was decribed for DW1000?
I see clock DC offset at XTI pin. Is any additional termination or DC biasing required at XTI H15 ball?
The clock buffer datasheet attached, XTAL TXC 8Y38472012 and low noise NCP163 LDO 2.5V used.