Table 8-1. Layout Recommendations Summary (continued)

ITEM

DESCRIPTION

11

For best results, the RF trace ground layer should be the ground layer immediately below the RF trace. The ground layer should be

solid.

12

There must be no traces or ground under the antenna section.

13

RF traces must be as short as possible. The antenna, RF traces, and modules must be on the edge of the PCB product. The

proximity of the antenna to the enclosure and the enclosure material must also be considered.

8.2.1 General Layout Recommendations

Ensure that the following general layout recommendations are followed:

• Have a solid ground plane and ground vias under the module for stable system and thermal dissipation.

• Do not place signal traces underneath the module on a layer where the module is mounted.

8.2.2 CC330xMOD RF Layout Recommendations

The RF section of this wireless module gets top priority in terms of layout. It is very important for the RF section

to be laid out correctly to ensure optimum performance from the module. A poor layout can cause low-output

power, EVM degradation, sensitivity degradation, and mask violations.

The image below shows the RF placement and routing of the CC3301MOD module with an external antenna.

SMA/U.FL

(Op onal)

RF Trace

Antenna

Matching

CC33x1MOD

Chip Antenna

Figure 8-2. RF Section Layout

Follow these RF layout recommendations for the CC330xMOD device:

• RF traces must have 50Ω impedance and should be no shorter than 9.24mm.

• RF trace bends must be made with gradual curves, and 90° bends must be avoided.

• RF traces must not have sharp corners.

• There must be no traces or ground under the antenna section.

• RF traces must have via stitching on the ground plane beside the RF trace on both sides.

• RF traces must be as short as possible. The antenna, RF traces, and the module must be on the edge of the

PCB product in consideration of the product enclosure material and proximity.

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CC3300MOD, CC3301MOD

SWRS333A – JULY 2025 – REVISED AUGUST 2025

Copyright © 2025 Texas Instruments Incorporated

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