AM1808_1008 Datasheet, PDF (76/264 Pages) Texas Instruments – AM1808 ARM Microprocessor

AM1808
SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010
www.ti.com
6.6.1 PLL Device-Specific Information
The PLL requires some external filtering components to reduce power supply noise as shown in
Figure 6-8.
1.14V - 1.32V
50R
0.1
0.01
µF
µF
V_SS
50R
PLLn_VDDA
PLLn_VSSA
Ferrite Bead: Murata BLM31PG500SN1L or Equivalent
Figure 6-8. PLL External Filtering Components
The input to the PLL is either from the on-chip oscillator or from an external clock on the OSCIN pin. PLL0
outputs seven clocks that have programmable divider options. PLL1 outputs three clocks that have
programmable divider options. Figure 6-9 illustrates the high-level view of the PLL Topology.
The PLLs are disabled by default after a device reset. They must be configured by software according to
the allowable operating conditions listed in Table 6-4 before enabling the device to run from the PLL by
setting PLLEN = 1.
76
Peripheral Information and Electrical Specifications
Submit Documentation Feedback
Product Folder Link(s): AM1808
Copyright © 2010, Texas Instruments Incorporated