欢迎访问ic37.com |
会员登录 免费注册
发布采购

CC1111EMK868-915 参数 Datasheet PDF下载

CC1111EMK868-915图片预览
型号: CC1111EMK868-915
PDF下载: 下载PDF文件 查看货源
内容描述: 低功耗低于1 GHz的射频系统级芯片(SoC )与MCU,存储器,收发器和USB控制器 [Low-power sub-1 GHz RF System-on-Chip (SoC) with MCU, memory, transceiver, and USB controller]
分类和应用: 存储射频控制器
文件页数/大小: 240 页 / 2823 K
品牌: TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
 浏览型号CC1111EMK868-915的Datasheet PDF文件第187页浏览型号CC1111EMK868-915的Datasheet PDF文件第188页浏览型号CC1111EMK868-915的Datasheet PDF文件第189页浏览型号CC1111EMK868-915的Datasheet PDF文件第190页浏览型号CC1111EMK868-915的Datasheet PDF文件第192页浏览型号CC1111EMK868-915的Datasheet PDF文件第193页浏览型号CC1111EMK868-915的Datasheet PDF文件第194页浏览型号CC1111EMK868-915的Datasheet PDF文件第195页  
CC1110Fx / CC1111Fx  
With the channel filter bandwidth set to  
500 kHz, the signal should stay within 80% of  
MDMCFG4.  
MDMCFG4.CHANBW_E  
00 01 10 11  
812 406 203 102  
CHANBW_M  
500 kHz, which is 400 kHz. Assuming  
915  
00  
01  
10  
11  
MHz frequency and ±20 ppm frequency  
uncertainty for both the transmitting device and  
the receiving device, the total frequency  
uncertainty is ±40 ppm of 915 MHz, which is  
±37 kHz. If the whole transmitted signal  
bandwidth is to be received within 400 kHz, the  
transmitted signal bandwidth should be  
maximum 400 kHz – 2·37 kHz, which is  
326 kHz.  
650 325 162  
541 270 135  
464 232 116  
81  
68  
58  
Table 63: Channel Filter Bandwidths [kHz]  
(assuming fref = 26 MHz)  
MDMCFG4.  
MDMCFG4.CHANBW_E  
The CC1110Fx/CC1111Fx supports channel filter  
bandwidths shown in Table 63 and Table 64  
respectively.  
CHANBW_M  
00  
01  
10  
11  
94  
75  
63  
54  
00  
01  
10  
11  
750 375 188  
600 300 150  
500 250 125  
429 214 107  
Table 64: Channel Filter Bandwidths [kHz]  
(assuming fref = 24 MHz)  
14.7 Demodulator, Symbol Synchronizer, and Data Decision  
gain before the sync word is detected, and  
FOCCFG.FOC_POST_K selects the gain after  
the sync word has been found.  
CC1110Fx/CC1111Fx contains an advanced and  
highly configurable demodulator. Channel  
filtering and frequency offset compensation is  
performed digitally. To generate the RSSI level  
(see section 14.10.3 for more information) the  
signal level in the channel is estimated. Data  
filtering is also included for enhanced  
performance.  
14.7.2 Bit Synchronization  
The bit synchronization algorithm extracts the  
clock from the incoming symbols. The  
algorithm requires that the expected data rate  
is programmed as described in Section 14.5  
on page 190. Re-synchronization is performed  
continuously to adjust for error in the incoming  
symbol rate.  
14.7.1 Frequency Offset Compensation  
When using 2-FSK, GFSK, or MSK  
modulation, the demodulator will compensate  
for the offset between the transmitter and  
receiver frequency, within certain limits, by  
estimating the centre of the received data. This  
value is available in the FREQEST status  
register. Writing the value from FREQEST into  
14.7.3 Byte Synchronization  
Byte synchronization is achieved by  
a
continuous sync word search. The sync word  
is a 16 bit configurable field (can be repeated  
to get a 32 bit) that is automatically inserted at  
the start of the packet by the modulator in  
transmit mode.The demodulator uses this field  
to find the byte boundaries in the stream of  
bits. The sync word will also function as a  
system identifier, since only packets with the  
correct predefined sync word will be received if  
the sync word detection in RX is enabled in  
register MDMCFG2 (see Section 14.10.1). The  
sync word detector correlates against the user-  
configured 16 or 32 bit sync word. The  
correlation threshold can be set to 15/16,  
16/16, or 30/32 bits match. The sync word can  
be further qualified using the preamble quality  
indicator mechanism described below and/or a  
carrier sense condition. The sync word is  
FSCTRL0.FREQOFF  
the  
frequency  
synthesizer is automatically adjusted according  
to the estimated frequency offset.  
The tracking range of the algorithm is  
selectable as fractions of the channel  
bandwidth with the FOCCFG.FOC_LIMIT  
configuration register.  
If the FOCCFG.FOC_BS_CS_GATE bit is set,  
the offset compensator will freeze until carrier  
sense asserts. This may be useful when the  
radio is in RX for long periods with no traffic,  
since the algorithm may drift to the boundaries  
when trying to track noise.  
The tracking loop has two gain factors, which  
affects the settling time and noise sensitivity of  
the algorithm. FOCCFG.FOC_PRE_K sets the  
SWRS033E  
Page 191 of 239