Atmel SpW-10X user manual SpaceWire Router, User Manual, Preliminary

SpW-10X	Ref.:	UoD_SpW-10X_
SpaceWire Router		UserManual
	Issue:	3.4
User Manual
	Date:	11th July 2008

Figure 5-3 PLL with external components

The PLL loop filter component values to be used are

R = 10 kΩ

C = 120 pF

C0 = 3.3 pf.

The VCO bias resistor depends on the required VCO frequency range which is determined by the PLL feedback divider (NF in Figure 5-3). The VCO bias resistor values to use are

Rvco = 4.7 kΩ for 100-150MHz (FEEDBDIV = 0b000, 0b001, or 0b010),

Rvco = 1.8 kΩ for 150MHz-200MHz (FEEDBDIV = 0b011, 0b100, 0b101 or 0b110, or 0b111).

See section 5.1 for information about the FEEDBDIV inputs.

A dedicated decoupling capacitors (100 nF and 1µF) are required for the PLL power supply.

Preliminary 46