Texas Instruments Chipcon CC2400DBK, User Manual, Page: 7 / 31

SWRU048 Page 7 of 30
Figure 3 depicts the antenna pattern while the CC2400DB is mounted horizontally with the
antennas parallel section aligned to the 0 degree direction.
Antenna
CC2400DB
0 degr.
Top view
Figure 4: Radiated antenna pattern vertical mounting
Figure 4 depicts the antenna pattern while the CC2400DB is mounted vertically with the
antennas parallel section aligned to the 0 degree direction.
Power supply section
The power supply section contains two voltage regulators: a 3.3 V regulator for use by the
microcontroller and the I/O pins of the CC2400, and a 1.8 V regulator for powering the
CC2400 core.
A diode prevents permanent damage if wrong polarity is applied to the board. There are two
power connectors; a 2.5mm DC jack-type connector allows you to connect an unregulated
battery eliminator easily (the positive supply is on the center pin), and a connector for a 9V
battery on the bottoms side of the PCB. It is also possible to use 3 or 4 AA or AAA alkaline
cells to power the CC2400DB if a suitable battery pack is used.