欢迎访问ic37.com |
会员登录 免费注册
发布采购

CC2430F32RTC 参数 Datasheet PDF下载

CC2430F32RTC图片预览
型号: CC2430F32RTC
PDF下载: 下载PDF文件 查看货源
内容描述: 真正的系统级芯片解决方案的2.4 GHz IEEE 802.15.4 / ZigBee的 [A True System-on-Chip solution for 2.4 GHz IEEE 802.15.4 / ZigBee]
分类和应用: 电信集成电路
文件页数/大小: 212 页 / 1862 K
品牌: TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
 浏览型号CC2430F32RTC的Datasheet PDF文件第171页浏览型号CC2430F32RTC的Datasheet PDF文件第172页浏览型号CC2430F32RTC的Datasheet PDF文件第173页浏览型号CC2430F32RTC的Datasheet PDF文件第174页浏览型号CC2430F32RTC的Datasheet PDF文件第176页浏览型号CC2430F32RTC的Datasheet PDF文件第177页浏览型号CC2430F32RTC的Datasheet PDF文件第178页浏览型号CC2430F32RTC的Datasheet PDF文件第179页  
CC2430  
Radio : PCB Layout Recommendation  
chip sequence must be modified such that the  
modulated MSK signal has the same phase  
shifts as the O-QPSK sequence previously  
defined.  
page 154. It can be seen from comparing the  
phase shifts of the O-QPSK signal with the  
frequency of a MSK signal that the MSK chip  
sequence is generated as:  
(c0 xnor c1), (c1 xor c2), (c2 xnor  
c3), … , (c32n-1 xor c32n)  
For a desired symbol sequence s0, s1, … , sn-1  
of length  
n
symbols, the desired chip  
sequence c0, c1, c2, …, c32n-1 of length 32n is  
found using table lookup from Table 44 on  
where c32n may be arbitrarily selected.  
14.32 PCB Layout Recommendation  
In the Texas Instruments reference design, the  
top layer is used for signal routing, and the  
open areas are filled with metallization  
connected to ground using several vias. The  
area under the chip is used for grounding and  
must be well connected to the ground plane  
with several vias.  
The external components should be as small  
as possible (0402 is recommended) and  
surface mount devices must be used.  
If using any external high-speed digital  
devices, caution should be used when placing  
these in order to avoid interference with the  
RF circuitry.  
The ground pins should be connected to  
ground as close as possible to the package  
pin using individual vias. The de-coupling  
capacitors should also be placed as close as  
possible to the supply pins and connected to  
the ground plane by separate vias. Supply  
power filtering is very important.  
A Development Kit, CC2430DK, with a fully  
assembled Evaluation Module is available. It is  
strongly advised that this reference layout is  
followed very closely in order to obtain the  
best performance.  
The schematic, BOM and layout Gerber files  
for the reference designs are all available from  
the TI website.  
14.33 Antenna Considerations  
where f is in MHz, giving the length in cm. An  
antenna for 2450 MHz should be 2.9 cm.  
CC2430 can be used together with various  
types of antennas. A differential antenna like a  
dipole would be the easiest to interface not  
needing a balun (balanced to un-balanced  
transformation network).  
Non-resonant monopole antennas shorter than  
λ/4 can also be used, but at the expense of  
range. In size and cost critical applications  
such an antenna may very well be integrated  
into the PCB.  
The length of the λ/2-dipole antenna is given  
by:  
Enclosing the antenna in high dielectric  
constant material reduces the overall size of  
the antenna. Many vendors offer such  
antennas intended for PCB mounting.  
L = 14250 / f  
where f is in MHz, giving the length in cm. An  
antenna for 2450 MHz should be 5.8 cm. Each  
arm is therefore 2.9 cm.  
Helical antennas can be thought of as a  
combination of a monopole and a loop  
antenna. They are a good compromise in size  
critical applications. Helical antennas tend to  
be more difficult to optimize than the simple  
monopole.  
Other commonly used antennas for short-  
range communication are monopole, helical  
and loop antennas. The single-ended  
monopole and helical would require a balun  
network between the differential output and  
the antenna.  
Loop antennas are easy to integrate into the  
PCB, but are less effective due to difficult  
impedance matching because of their very low  
radiation resistance.  
Monopole antennas are resonant antennas  
with a length corresponding to one quarter of  
the electrical wavelength (λ/4). They are very  
easy to design and can be implemented  
simply as a “piece of wire” or even integrated  
into the PCB.  
For low power applications the differential  
antenna is recommended giving the best  
range and because of its simplicity.  
The length of the λ/4-monopole antenna is  
given by:  
L = 7125 / f  
CC2430 Data Sheet (rev. 2.1) SWRS036F  
Page 175 of 211