Antenna
CC2420DB
0 degr.
Top view
Figure 4: Radiated antenna pattern vertical mounting
Figure 4 depicts the antenna pattern while the CC2420DB is mounted vertically with the
antennas parallel section aligned to the 0 degree direction.
The peak antenna gain is –5 dBi, the corresponding peak field strength is 90dBuV/m.
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 CC2420. The internal regulator of CC2420 is used to
generate the 1.8 voltage supply applied for powering of the CC2420 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 4 AA or AAA alkaline cells to
power the CC2420DB if a suitable battery pack is used.
Chipcon AS
SmartRF
®
CC2420DBK Demonstration Board Kit User Manual
(rev. 1.3) 2004-11-03 Page 7/ 52
