CC2564C Datasheet, PDF (46/52 Pages) Texas Instruments – CC2564C Dual-Mode Bluetooth Controller

CC2564C
SWRS199A – APRIL 2016 – REVISED NOVEMBER 2016
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7.2.5 RF Interface
Guidelines for the RF Interface follow:
• TI recommends using an RF shield (not mandatory).
• Verify that RF traces are routed on the top layer and matched at 50 Ω with reference to ground.
• Route the RF line between these NC pins:
– NC_2 (A10)
– NC_3 (A11)
– NC_14 (B9)
– NC_15 (B10)
These NC pins are grounded for better RF isolation.
NOTE
These pins are NC at the chip level, but TI recommends grounding them on the PCB layout
for better RF isolation.
• Ensure the area underneath the BPF pads is grounded on layer 1 and layer 2.
• Keep RF_IN and RF_OUT of the BPF pads clear of any ground fill (see the RF Trace section in
CC256x QFN PCB Guidelines).
• Follow guidelines specified in the vendor-specific antenna design guides (including placement of
antenna).
• Follow guidelines specified in the vendor-specific BPF design guides.
• Verify that the Bluetooth RF trace is a 50-Ω, impedance-controlled trace with reference to solid ground.
• Ensure that the RF trace length is as short as possible.
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Applications, Implementation, and Layout
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