CC2564MODN Datasheet, PDF (37/62 Pages) Texas Instruments – Bluetooth Host Controller Interface (HCI) Module

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CC2564MODN, CC2564MODA
SWRS160D – FEBRUARY 2014 – REVISED DECEMBER 2015
6.2.1.4.2 Ground
The common ground must be the solid ground plane in layer 2. TI recommends using a large ground pad
under and around the module and placing enough ground vias beneath for a stable system and thermal
dissipation (see Figure 6-11).
Figure 6-11. Using a Large Ground Pad Under the Module
6.2.1.5 Clock Guidelines
Remember that clock signal routing directly influences RF performance because of the signal trace
susceptibility to noise.
6.2.1.5.1 Slow Clock
TI recommends the following guidelines:
• Keep the slow clock signal lines as short as possible and at least 4-mils wide.
• Traces of slow clock signals must have a ground plane on each side of the signal trace to reduce
undesired signal coupling.
• To reduce the capacitive coupling of undesired signals into the clock line, do not route slow clock
traces above or below other signals (especially digital signals). Figure 6-12 shows the slow clock trace
in the TI reference design.
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Applications, Implementation, and Layout
37
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