Texas Instruments Chipcon CC2400DBK, User Manual, Page: 4 / 31

SWRU048 Page 4 of 30
PCB
Figure 1 depicts an overview of the CC2400DB with description of the various components
embedded on the PCB.
Figure 1: CC2400DB overview
RF Section
The CC2400DB RF section includes all the necessary components for correct operation. The
CC2400 is connected to a 16 MHz crystal. A small 2.4 GHz PCB antenna is also included. RF
test and measurement equipment can be mounted the PCB by the use of an SMA connector,
by swapping capacitor placement of C63 and C62. See schematics for details. The RF layout
is identical to the CC2400EM, which is part of the CC2400DK Development Kit.
Important:
The CC2400DB demonstration board output power must be reduced for a 100% transmission
duty cycle to be compliant with the FCC 15 2
nd
harmonics regulation requirement. At the
moment the design is 1 dB above the limit.
Antenna
The PCB antenna is a so-called Inverted-F type. The Inverted-F antenna is a wire monopole
where the top section is folded down to be parallel with the ground plane. By folding the
antenna down you will reduce the height and maintain a resonant wire length. A capacitance
will be introduced to the input impedance of the antenna due to the parallel section. However,
as a rule of thumb design guide, the height (L+H) will be approximately equal to a
1.8V voltage
regulator
Optional 9V
battery
Leds
4-10 V
DC-jack
Temp. sensor
CC2400 RF
section
PCB
antenna
buttons
MCU
section
RS-232
port
Joystick
3.3V voltage
regulator