Electronic Components Datasheet Search
Selected language     English  ā–¼

Delete All
ON OFF

Advanced Search

              





RFM95 Datasheet(PDF) 22 Page - HOPE Microelectronics CO., Ltd.

Part No. RFM95
Description  Low Power Long Range Transceiver Module
Download  121 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  HOPE [HOPE Microelectronics CO., Ltd.]
Homepage  https://www.hoperf.com/
Logo 

 22 page
background image
Page 22
RFM95/96/97/98(W)
Tel: + 86-755-82973805
Fax: + 86-755-82973550
E-mail: sales@hoperf.com http:/ / www.hoperf.com
WIRELESS & SENSING
PRELIMINARY
DATASHEET
4. RFM95/96/97/98(W) Digital Electronics
4.1. The LoRa
TM
Ā  Modem
The LoRaTMĀ  modem uses spread spectrum modulation and forward error correction techniques to increase the range and
robustness of radio communication links compared to traditional FSK or OOK based modulation. Examples of the
performance improvement possible, for several possible settings, are summarised in the table below. Here the spreading
factor and error correction rate are design variables that allow the designer to optimise the trade-off between occupied
bandwidth, data rate, link budget improvement and immunity to interference.
Table 58 Example LoRa
TM
Ā  Modem Performances
Bandwidth
(kHz)
Spreading Factor
Coding rate
Nominal Rb
(bps)
Sensitivity
indication
(dBm)
Frequency
Reference
6
4/5
782
TBC
10.4
12
4/5
24
TBC
6
4/5
1562
TBC
20.8
12
4/5
49
TBC
TCXO
6
4/5
4688
-121
62.5
12
4/5
146
-139
6
4/5
9380
-118
125
12
4/5
293
-136
XTAL
For European operation the range of crystal tolerances acceptable for each sub-band (of the ERC 70-03) is given in the
specifications table. For US based operation a frequency hopping mode is available that automates both the LoRaTMĀ spread
spectrum and frequency hopping spread spectrum processes.
Another important facet of the LoRaTMĀ  modem is its increased immunity to interference. The LoRaTMĀ  modem is capable of
co-channel GMSK rejection of up to 25 dB. This immunity to interference permits the simple coexistence of LoRaTMĀ 
modulated systems either in bands of heavy spectral usage or in hybrid communication networks that use LoRaTMĀ to extend
range when legacy modulation schemes fail.




Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63  64  65  66  67  68  69  70  71  72  73  74  75  76  77  78  79  80  81  82  83  84  85  86  87  88  89  90  91  92  93  94  95  96  97  98  99  100   ...More


Datasheet Download




Link URL

Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Bookmark   |   Link Exchange   |   Manufacturer List
All Rights ReservedĀ© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl