I want to use the internal regulator of TSB81BA3E. -> VREG_PD will be connected to GND.
I want to separate the DVDD-CORE and the PLLVDD-CORE pins in PCB-Layout.
I want to connect only two banks of KerKos to DVDD-CORE and PLLVDD-CORE pins.
This means on the unassembled PCB the DVDD-CORE and the PLLVDD-CORE pins are galvanically isolated!
Question:
Are there two internal linear regulators, one for DVDD-CORE and one for PLLVDD-CORE or
is there only one regulator and DVDD-CORE and PLLVDD-CORE pins are connected internally or
do I have to connect PLLVDD-CORE via an ferrite bead with DVDD-CORE?
Remark: I read the SLLA153A - October 2004 Application Report for the TSB41BA3A.
In the schematic at PDF page 9, the ferrite bead FB4 on PLLVDD(CORE) make a high frequency isolation from the left sided PLLVDD-Core pins to the right sided attached KerKos.
That does not make sense to me and looks like a mistake in this reference design.
Regards
Andreas
