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XE1205
6
HIGHEST BIT RATES: EXAMPLE OF 304.7 KBIT/S OPERATION
XE1205 is able to sustain other bit rates between 152.34 kbit/s and 304.7 kbit/s using OSR_minus_1 register as
described in section 5.2.3.2. It is recommended whenever possible to use a modulation index ( β =2 Δ f/BR) ≥ 2
whenever possible. For the highest bit rates the receiver filter bandwidth will limit the maximal usuable β . Lower
modulation indexes should be used then. In this chapter we provide the example of the highest bit rate.
In order to operate at 304.7 kbit/s the following settings should be used:
Please note that exact bitrate value is 304.6875 kbit/s.
6.1
6.1.1
REGISTERS SETTINGS
Bitrate (BR) and frequency deviation (fdev)
At 304.7 kbit/s, a modulation index close to 1 is compulsory because of the limited bandwidth of the Rx filter.
Frequency deviation will be set to 160 kHz to also take benefit from the Tx filter available (Cf Table 11).
Consequently, following settings should be programmed:
Name
Freq_dev(8:0)
Br(6:0)
Chg_OSR
OSR (7:0)
Address
0
1
2
27
28
Bits
0
7-0
6-0
4
7-0
Value (d)
320
0
1
15
Note
160.36 kHz
152.34 kbit/s…
…=>304.68 kbit/s
Table 12: common registers settings for 304.7 kbit/s
6.1.2
Rx filter
For a correct behavior we recommend to have an Rx filter bandwidth of minimum fdev + (BR/2).
Consequently, following settings should be programmed:
Name
BW(1:0)
Max_BW
TParam_Low_BW
TParam_Code_BW(8:0)
Address
8
8
19
21
22
Bits
6-5
4
2
6-0
7-6
Value (d)
3
0
1
87
Note
200 kHz…
…=>320 kHz
Table 13: Rx registers settings for 304.7 kbit/s
6.1.3
Tx filter
Tx filter is also available at 304.7 kbit/s operation and although not compulsory, its use is recommended to reduce
spectrum bandwidth. Contrary to the other bitrates, an additional specific bit must be set.
Consequently, following settings should be programmed:
Name
Filter
304 kbit/s_filter
Address
7
18
Bits
4
3
Value (d)
1
1
Note
Table 14: Tx registers settings for 304.7 kbit/s
? Semtech 2008
22
www.semtech.com
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