PCK2023DGG Philips Semiconductors, PCK2023DGG Datasheet - Page 21

• Manufacturer Part Number: PCK2023DGG
• Description: CK408 66/100/133/200 MHz spread spectrum differential system clock generator
• Manufacturer: Philips Semiconductors

through correct implementation in the system board. This application
Philips Semiconductors
APPLICATION NOTES
Optimum performance of the PCK2023 can only be achieved
note addresses many of the issues associated with integrating the
PCK2023 on a system board. Descriptions for circuit board layout
and decoupling are provided in this application note.
Circuit board layout
It is possible to generate a circuit board with the proper
characteristics using four-layer configuration. Figure 11 shows the
layer stack-up. It is critical to keep the clock signals on a plane next
to a ground plane to ensure they are ground referenced otherwise
the clock signals may experience significant distortion and added
jitter. Static signals (such as SPREAD, PWRDWN, etc.) can be
placed on a layer next to the power plane.
2001 Sep 07
CK408 (66/100/133/200 MHz) spread
spectrum differential system clock generator
Figure 11. Optimum board layout
21
The components associated with the clocks should be placed on the
same layer as the PCK2023 IC. This will allow the layout to avoid
the use of vias for interconnect, thereby reducing node capacitance
and trace inductance. All components should be placed as close to
the IC as possible.
CLOCK SIGNALS
GROUND
POWER
STATIC SIGNALS
SW00857
PCK2023
Product data