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S2-LP 데이터시트(PDF) 32 Page - STMicroelectronics

부품명 S2-LP
상세설명  Excellent receiver selectivity and blocking
PDF  90 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

S2-LP 데이터시트(HTML) 32 Page - STMicroelectronics

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DocID029944 Rev 1
Furthermore, since the payload is normally arranged in bytes, the arrangement can change
the mapping for both 2-(G)FSK and 4-(G)FSK modulations, by using the CONST_MAP
(register MOD1), in the following way:
Table 38: Constellation mapping 2-(G)FSK
Format
Symbol
CONST_MAP coding
0
1
2
3
2-(G)FSK
0
-FDEV
NA
+FDEV
NA
1
+FDEV
NA
-FDEV
NA
Table 39: Constellation mapping 4-(G)FSK
Format
Symbol
CONST_MAP coding
0
1
2
3
4-(G)FSK
01
-FDEV/3
-FDEV
+FDEV/3
+FDEV
00
-FDEV
-FDEV/3
+FDEV
+FDEV/3
10
+FDEV/3
+FDEV
-FDEV/3
-FDEV
11
+FDEV
+FDEV/3
-FDEV
-FDEV/3
Furthermore, in the 4-(G)FSK it is also possible to swap the symbols using the
4FSK_SYM_SWAP field (register PCKTCTRL3) as follows:
When 4FSK_SYM_SWAP = 0: {
S0 =< b7b6 >
S1 =< b5b4 >
S2 =< b3b2 >
S3 =< b1b0 >
When 4FSK_SYM_SWAP = 1: {
S0 =< b6b7 >
S1 =< b4b5 >
S2 =< b2b3 >
S3 =< b0b1 >
5.4.1.1
Gaussian shaping
In 2-GFSK or 4-GFSK mode, the Gaussian filter BT product can be set by using the
register BT_SEL to 1 or 0.5.
The Gaussian filtering is implemented by poly-phase filtering with eight taps per symbol
time. In order to further smooth the filter shape and improve spectral shaping, the output of
the filter can be linearly interpolated by setting the register MOD_INTERP_EN.
A mathematical interpolation factor is applied at each sample of the Gaussian filter output.
This factor is 64 for data rates corresponding to DATA_RATE_E < 5, it is automatically
scaled as
64
2����������������_����������������_����−5
for 5 ≤ DATA_RATE_E < 11 and it is automatically disabled for
DATA_RATE_E = 11.
The actual interpolation factor achieved may be limited by the minimal frequency
resolution of the frequency synthesizer.



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