XE1203F データシートの表示（PDF） - Semtech Corporation
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XE1203F Datasheet PDF : 36 Pages
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XE1203F
Datain or
data
No filtering
INfreq_synth
Staircase filtering
INfreq_synth
Figure 8: Modulation with and without pre-filtering
The main characteristic of this pre-filtering function is the ratio between the rise/fall time to the bit duration, trise/tbit.
The value of this ratio can be programmed between two pre-defined values in the RTParam_Stair configuration bit,
as shown in the Table 7.
RTParam_Stair
0
1
Table 7: trise/tbit ratio
trise/tbit
10%
20%
When the pre-filtering function is enabled (RTParam_Filter set to “1”), only the following bit rates and frequency
deviations can be used:
FSParam_Dev
00101000
00110111
01010000
10100000
11001000
Frequency deviation
40 kHz
55 kHz
80 kHz
160 kHz
200 kHz
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www.semtech.com
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